CN111458343B - Testing equipment and testing methods - Google Patents

Abstract

The present invention provides a detection device and a detection method, wherein the detection device comprises: a first stroboscopic light source, configured to emit a first detection light to an object to be detected on a carrying surface, the first detection light forms a first signal light through the object to be detected; a second stroboscopic light source, configured to emit a second detection light to the object to be detected on the carrying surface, the second detection light forms a second signal light through the object to be detected, the first stroboscopic light source and the second stroboscopic light source are configured to alternately emit the first detection light and the second detection light to the object to be detected multiple times; a first detection device, configured to alternately detect the first signal light and the second signal light multiple times to obtain first detection information. The detection device has a simple structure, low cost, and can reduce false detections.

Description

Testing equipment and testing methods

Technical Field

The present invention relates to the field of detection, and in particular to a detection device and a detection method.

Background technique

Glass materials are widely used in modern industrial manufacturing, such as mobile phone screens, optical lenses, battery cells, curved display screens, etc. With the improvement of processing level, more and more glass products are designed into curved structures to achieve better functions or better appearance. Since the curved surface is difficult to process, the mirror surface is more likely to have defects, thus affecting its function and appearance. Therefore, this part needs to be tested to ensure the product qualification rate.

The detection of surface defects of glass products mainly adopts the optical detection method. In order to increase the detection accuracy and reduce the false detection rate, it is often necessary to perform multi-channel detection on the product, including bright field detection, dark field detection and backlight detection. Bright field detection is a method of detecting the surface of the object to be tested by detecting the intensity of the light beam reflected from the surface of the object to be tested. Bright field detection has the advantages of high sensitivity and simple program setting, and has important applications in industrial detection. Dark field detection is a method of detecting the surface of the object to be tested by detecting the intensity of scattered light on the surface of the object to be tested. Dark field detection can achieve better sensitivity for the detection of defects such as bulges. Backlight detection is to detect the light beam passing through the glass product by passing the light beam through the glass product. Backlight detection has high accuracy in detecting the broken edge of glass products.

However, the existing equipment for testing products through multiple channels is often large in size, complex in structure and high in cost.

Summary of the invention

The problem solved by the present invention is to provide a detection device and a detection method, which can simplify the structure of a multi-channel detection device and reduce the cost.

To solve the above problems, the present invention provides a detection device, including a carrying surface for placing an object to be tested, characterized in that the detection device includes: a first stroboscopic light source, configured to emit a first detection light to the object to be tested on the carrying surface, the first detection light forms a first signal light through the object to be tested; a second stroboscopic light source, configured to emit a second detection light to the object to be tested on the carrying surface, the second detection light forms a second signal light through the object to be tested, the first stroboscopic light source and the second stroboscopic light source are configured to alternately emit the first detection light and the second detection light to the object to be tested multiple times; a first detection device, configured to alternately detect the first signal light and the second signal light multiple times to obtain first detection information.

Optionally, the first detection light and the second detection light have the same wavelength.

Optionally, the detection device includes a moving device, and the moving device is used to drive the object to be detected to move relative to the first light source, the second light source and the first detection device.

Optionally, the moving device includes multiple conveyor belt devices, which are used to move the object to be tested along the same conveying direction; there are gaps between adjacent conveyor belt devices; the bearing surface is located on the surface of the conveyor belt device, and during detection, the object to be tested is located on the bearing surface and spans the gap.

Optionally, the conveyor device has one or more gaps, the one or more gaps include a first gap, the second stroboscopic light source is located on a side of the bearing surface close to the conveyor device; the second detection light is used to pass through the first gap to reach the surface of the object to be measured.

Optionally, the first stroboscopic light source is a bright field light source, and the second stroboscopic light source is a dark field light source or a backlight source; or, the first stroboscopic light source and the second stroboscopic light source are both dark field light sources, and the propagation directions of the first detection light and the second detection light are different; or, the second stroboscopic light source is a bright field light source, and the first stroboscopic light source is a dark field light source or a backlight source.

Optionally, the detection equipment also includes a third stroboscopic light source, which is configured to emit a third detection light to the object to be tested, and the third detection light forms a third signal light through the object to be tested. The first light source, the second light source and the third light source are configured to alternately emit the first detection light, the second detection light and the third detection light to the object to be tested multiple times; the first detection device is also configured to detect the third detection light; the third stroboscopic light source is a dark field light source, and the number of the third stroboscopic light sources is one or more, and the propagation directions of the detection lights emitted by the multiple dark field light sources are different.

Optionally, the first stroboscopic light source and the second stroboscopic light source are linear light sources, and the extension direction of the light spots formed by the first stroboscopic light source and the second stroboscopic light source on the surface of the object to be measured is perpendicular to the transmission direction, and the light spots pass through the test area of the object to be measured along the transmission direction.

Optionally, the frequency of the first detection device is 15k~25k times/second; the flash frequency of the first stroboscopic light source is 30k~50k times/second; and the flash frequency of the second stroboscopic light source is 30k~50k times/second.

Optionally, the detection equipment also includes: a first illumination light source, the first illumination light source is an arc light source, the light emitting surface of the arc light source is an arc surface, and the arc surface of the arc light source protrudes in a direction away from the bearing surface; the first illumination light source is configured to emit a fourth detection light to the object to be tested, and the fourth detection light is reflected by the object to be tested to form a fourth signal light; a second detection device, used to detect the fourth signal light to obtain second detection information.

Optionally, the first stroboscopic light source is a bright field light source, and the light-emitting surface of the first stroboscopic light source is a plane or a curved surface; the first illumination light source and the first stroboscopic light source are respectively used to illuminate two opposite surfaces of the object to be measured.

Optionally, it also includes: a moving device, the moving device includes multiple conveyor belt devices, the multiple conveyor belt devices are used to move the object to be tested along the same conveying direction, the carrying surface is located on the surface of the conveyor belt device; there is a gap between adjacent conveyor belt devices; the conveyor belt device has one or more gaps, the one or more gaps include a second gap, and during detection, the object to be tested is located on the carrying surface and spans the second gap; the fourth detection device and at least part of the first illumination light source are located on the side of the carrying surface close to the second gap, and the fourth detection light is used to pass through the second gap to reach the surface of the object to be tested.

Optionally, the first stroboscopic light source is a bright field light source, and the second stroboscopic light source is a backlight source; the one or more gaps include a third gap; the detection equipment also includes: a second illumination light source, used to emit a sixth detection light to the third gap, the sixth detection light is scattered by the object to be detected to form a sixth signal light; a fourth detection device, used to detect the sixth signal light to obtain fourth detection information; a third illumination light source, used to emit a seventh detection light to the third gap, the seventh detection light is scattered by the object to be detected to form a seventh signal light, and the third illumination light source and the second illumination light source are respectively used to illuminate two opposite surfaces of the object to be detected; and a fifth detection device, used to detect the seventh signal light to obtain fourth detection information.

Optionally, it also includes: a processing system for respectively extracting first detection information of the first signal light and the second signal light according to first detection information of the first detection device at different times to form a first image and a second image.

Optionally, it also includes: a control device, used to send a first stroboscopic trigger signal to the first stroboscopic light source and the first detection device, and send a second stroboscopic trigger signal to the second stroboscopic light source and the first detection device, and the triggering times of the first stroboscopic trigger signal and the second stroboscopic trigger signal are arranged alternately; the processing system is used to obtain first detection information of the first signal light according to the triggering time of the first stroboscopic trigger signal to form a first image, and to obtain first detection information of the second signal light according to the triggering time of the second stroboscopic trigger signal to form a second image.

Optionally, it also includes: a fourth stroboscopic light source, used to emit a fifth detection light to the object to be tested, the fifth detection light forms a fifth signal light through the object to be tested, and the fourth stroboscopic light source and the first stroboscopic light source are respectively located on both sides of the carrying surface; a third detection device, used to detect the fifth signal light to obtain third detection information, and the third detection device and the first detection device are respectively located on both sides of the carrying surface.

Optionally, the first stroboscopic light source, the second stroboscopic light source and the fourth stroboscopic light source are used to alternately emit detection light to the object to be measured; or, the wavelength of the fourth detection light is different from that of the first detection light, and the wavelength of the fourth detection light is different from that of the second detection light; the first detection device includes a first filter component for filtering out the fourth signal light; and the third detection device includes a second filter component for filtering out the first signal light and the second signal light.

Correspondingly, the present invention also provides a detection method, which is characterized in that it includes: placing an object to be tested on a carrying surface of a detection device; emitting a first detection light and a second detection light to the object to be tested alternately multiple times by a first stroboscopic light source and a second stroboscopic light source, wherein the first detection light forms a first signal light after passing through the object to be tested, and the second detection light forms a second signal light after passing through the object to be tested; and alternately detecting the first signal light and the second signal light multiple times by a first detection device to obtain first detection information.

Optionally, when the detection device further includes a processing system, the detection method further includes: extracting first detection information of the first signal light and the second signal light respectively according to first detection information of the first detection device at different times through the processing system to form a first image and a second image.

Optionally, when the detection equipment also includes a control device, emitting the first detection light and the second detection light to the object to be detected multiple times and alternately through the first stroboscopic light source and the second stroboscopic light source includes: sending a first stroboscopic trigger signal to the first stroboscopic light source and the first detection device through the control device; sending a second stroboscopic trigger signal to the second stroboscopic light source and the second detection device; forming the first image and the second image includes: acquiring first detection information of the first signal light according to the trigger time of the first stroboscopic trigger signal to form the first image; acquiring first detection information of the second signal light according to the trigger time of the second stroboscopic trigger signal to form the second image.

Optionally, when the detection equipment further includes: a fourth stroboscopic light source and a third detection device; multiple times of alternately emitting the first detection light and the second detection light to the object to be detected includes: making the first stroboscopic light source, the second stroboscopic light source and the fourth stroboscopic light source multiple times of alternately emitting detection light to the object to be detected; obtaining the first detection information includes: multiple times of alternately detecting the first signal light, the second signal light and the fifth signal light by the first detection device; the detection method further includes: multiple times of alternately detecting the first signal light, the second signal light and the fifth signal light by the third detection device to obtain the third detection information.

Optionally, when the wavelength of the fifth detection light is different from that of the first detection light, and the wavelength of the fifth detection light is different from that of the second detection light; the detection method further includes: detecting the fifth signal light by a third detection device to obtain third detection information; the moment when the fifth signal light is detected by the third detection device partially or completely overlaps with the moment when the first detection device detects the first signal light or the second signal light.

Optionally, when the detection device further includes: a first illumination light source, the first illumination light source is an arc-shaped light source, the light-emitting surface of the arc-shaped light source is an arc-shaped surface, and the arc-shaped surface of the arc-shaped light source protrudes in a direction away from the bearing surface; the fourth detection light is used to pass through the second gap to reach the surface of the object to be tested; the object to be tested includes a first surface and a second surface relative to each other, the first surface is a concave surface, and the second surface is a convex surface; placing the object to be tested on the bearing surface of the detection device includes: making the second surface contact with the bearing surface.

Compared with the prior art, the technical solution of the present invention has the following advantages:

In the detection device provided by the technical solution of the present invention, the detection device includes a first stroboscopic light source and a second stroboscopic light source. Since the first stroboscopic light source and the second stroboscopic light source are configured to emit the first detection light and the second detection light to the object to be detected multiple times alternately, and the first detection device is configured to detect the first signal light and the second signal light multiple times alternately, the first detection information obtained by the first detection device based on the first signal light and the second signal light can be separated according to the detection time to obtain the first detection information of different channels. Since there is no overlap in time, the detection accuracy can be improved. At the same time, the detection device can obtain the first detection information of the first signal light and the second detection light through a first detection device, so that the structure of the detection device can be simplified, the integration can be improved, and the cost can be reduced.

Furthermore, the detection device includes a moving device, and the first stroboscopic light source and the second stroboscopic light source are configured to emit the first detection light and the second detection light to the object to be detected multiple times alternately. The detection device is used to drive the object to be detected to move, and the first stroboscopic light source and the second stroboscopic light source are used to emit the first detection light and the second detection light to the object to be detected multiple times alternately. The detection device is used to detect, so that a detection image of a larger area of the surface of the object to be detected can be obtained.

Furthermore, there are gaps between the multiple conveyor belt devices, and the second detection light can pass through the gaps to reach the object to be tested, thereby realizing backlight detection of the object to be tested, or performing bright field or dark field detection on the side of the object to be tested close to the moving device.

Furthermore, the detection device further comprises: an arc-shaped light source, the light-emitting surface of the arc-shaped light source is an arc-shaped surface, and the arc-shaped surface of the arc-shaped light source is concave in the direction away from the bearing surface. The arc-shaped light source and the second detection device can perform bright field detection on the object to be tested with a convex surface. The light-emitting surface of the first stroboscopic light source is a plane or an arc-shaped surface, which can realize bright field detection of the plane and concave surface of the object to be tested. Therefore, the detection device can realize double-sided bright field detection of the object to be tested with a curved surface.

Furthermore, by detecting the fourth detection light through the second detection device, the exposure time of the first detection device for detecting the first detection light and the second detection light can be increased, thereby improving the clarity of the detected image.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an embodiment of a detection device of the present invention;

2 and 3 are schematic diagrams of the structure of a second embodiment of a detection device of the present invention;

FIG4 is a schematic structural diagram of a third embodiment of a detection device of the present invention;

5 is a schematic structural diagram of a fourth embodiment of a detection device of the present invention;

6 is a schematic diagram of the structure of a fifth embodiment of a detection device of the present invention;

FIG. 7 is a flow chart of the steps in an embodiment of a detection method of the present invention.

Detailed ways

There are many problems with existing testing equipment, such as complex structure and high cost.

Now we analyze the reasons for its complex structure and high cost by combining a detection equipment.

In order to improve the accuracy of detection and reduce false detection, existing detection equipment often sets multiple channels to detect products. Due to the large number of detection channels, the detection equipment structure is complex and the cost is high.

In order to simplify the structure of the detection equipment, one method is to use light beams of different wavelengths to detect different channels, and separate the images taken by different channels according to the different wavelengths of the light beams. However, since the light beams in the visible light range often overlap, this method easily leads to reduced detection accuracy.

To solve the technical problem, the present invention provides a detection device, comprising: a first stroboscopic light source, configured to emit a first detection light to the object to be detected on the carrying surface, the first detection light forms a first signal light through the object to be detected; a second stroboscopic light source, configured to emit a second detection light to the object to be detected on the carrying surface, the second detection light forms a second signal light through the object to be detected, the first stroboscopic light source and the second stroboscopic light source are configured to alternately emit the first detection light and the second detection light to the object to be detected multiple times; a first detection device, configured to alternately detect the first signal light and the second signal light multiple times to obtain first detection information. The detection device has a simple structure, low cost, and can reduce false detections.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of an embodiment of a detection device of the present invention.

Please refer to FIG. 1 , the detection device includes: a first stroboscopic light source 121 configured to emit a first detection light to the object to be detected 110 , wherein the first detection light forms a first signal light through the object to be detected 110 ;

The second stroboscopic light source 122 is configured to emit a second detection light to the object under test 110, and the second detection light forms a second signal light through the object under test 110. The first stroboscopic light source 121 and the second stroboscopic light source 122 are configured to emit the first detection light and the second detection light to the object under test 110 alternately for multiple times.

The first detection device 111 is configured to detect the first signal light and the second signal light alternately for multiple times to obtain first detection information.

The detection device includes a first stroboscopic light source 121 and a second stroboscopic light source 122. Since the first stroboscopic light source 121 and the second stroboscopic light source 122 are configured to emit the first detection light and the second detection light to the object to be detected 110 alternately for multiple times, and the first detection device 111 is configured to detect the first signal light and the second signal light alternately for multiple times, the first detection information obtained by the first detection device 111 according to the first signal light and the second signal light can be separated according to the detection time, and the first detection information of different channels can be obtained. Since there is no overlap in time, the detection accuracy can be improved. At the same time, the detection device can obtain the first detection information of the first signal light and the second signal light through a first detection device 111, so that the structure of the detection device can be simplified, the integration can be improved, and the cost can be reduced.

In this embodiment, the detection device includes a carrying surface for placing the object to be detected 110. In this embodiment, the detection device also includes a moving device for driving the object to be detected 110 to move relative to the first stroboscopic light source 121, the second stroboscopic light source 122 and the first detection device 111.

The moving device is used to drive the object to be detected 110 to move along the transmission direction relative to the first light source, the second light source and the first detection device 111. The bearing surface is located on the surface of the moving device.

The object to be tested 110 includes a first surface and a second surface opposite to each other, and the second surface is used for contacting with the mobile device.

In this embodiment, the first stroboscopic light source 121 is a bright field light source, and the first detection light forms a first signal light after being reflected by the object to be measured 110; the second stroboscopic light source 122 is a backlight source, that is, the second detection light passes through the object to be measured 110 to form a first signal light received by the first detection device 111. The first stroboscopic light source 121 and the first detection device 111 are located on the same side of the carrying surface. Specifically, the first stroboscopic light source 121 and the first detection device 111 are located on the side of the carrying surface away from the mobile device; the second stroboscopic light source 122 and the first detection device 111 are respectively located on both sides of the carrying surface, that is, the second stroboscopic light source 122 is located on the side of the carrying surface close to the mobile device.

In this embodiment, the first stroboscopic light source 121 and the second stroboscopic light source 122 emit light alternately, and the first detection device 111 only detects the first signal light and the second signal light alternately.

In this embodiment, the wavelengths of the first detection light and the second detection light are the same. The wavelengths of the first detection light and the second detection light are the same, which can simplify the difficulty of adjusting the first detection device 111. In other embodiments, the wavelengths of the first detection light and the second detection light may be different.

The first detection device 111 is a line detector, that is, the detection area of the first detection device 111 on the surface of the object to be detected 110 is linear. Specifically, in this embodiment, the detection area is the surface area of the object to be detected 110 captured by the first detection device 111. The detection area of the first detection device 111 passes through the detection area of the object to be detected 110 perpendicular to the transmission direction.

The first stroboscopic light source 121 and the second stroboscopic light source 122 are linear light sources, and the extension direction of the light spots formed by the first stroboscopic light source 121 and the second stroboscopic light source 122 on the surface of the object to be tested 110 is perpendicular to the transmission direction, and the light spots pass through the test area of the object to be tested 110 along the transmission direction. The linear light source refers to a light source whose light-emitting surface is much longer than its width.

In other embodiments, the first stroboscopic light source and the second stroboscopic light source may be surface light sources, and the first detection device may be a surface detector.

In this example, both the first stroboscopic light source 121 and the second stroboscopic light source 122 are LED light sources. In other embodiments, the first stroboscopic light source and the second stroboscopic light source may be laser light sources.

In this embodiment, the first detection light and the second detection light are red light. In other embodiments, the first detection light and the second detection light can be yellow light or blue light.

When the surface of the object to be tested 110 is scanned by the detection device to obtain the surface image of the object to be tested 110, the object to be tested 110 needs to move relative to the first detection device 111. If the moving speed of the object to be tested 110 is too slow, the detection speed and detection efficiency are easily reduced; if the moving speed of the object to be tested 110 is too fast, it is not easy for the first detection device 111 to obtain the image of the entire surface of the test area.

If the shooting frequency of the first detection device 111 is too low, the time interval between taking a photo is long, and the distance moved by the object to be tested 110 during the time interval is large, which may easily lead to missing photos of some areas on the surface of the object to be tested 110. Therefore, the shooting frequency of the first detection device 111 should not be too low. If the detection light to be detected by the first detection device 111 is emitted by more light sources, the shooting frequency of the first detection device 111 is higher in order to reduce missed photos.

If the shooting frequency of the first detection device 111 is high, the time interval between the first detection device 111 shooting two images is short. Since the exposure time of the first detection device 111 shooting each image needs to be less than the time interval between shooting two images, if the detection light that the first detection device 111 needs to detect is emitted by more light sources, the exposure time of the first detection device 111 is short when shooting each image, which is easy to reduce the clarity of each image, and thus the number of different detection lights that the first detection device 111 needs to detect is not too large. Therefore, in this embodiment, the first stroboscopic light source 121 and the second stroboscopic light source 122 emit light alternately, and the first detection device 111 only detects the first signal light and the second signal light alternately.

The frequency of the first detection device is greater than or equal to the sum of the frequencies of the detection devices that emit the signal light received by the first detection device. Specifically, in this embodiment, the frequency of the first detection device is equal to the sum of the frequencies of the detection devices that emit the signal light received by the first detection device.

Specifically, in this embodiment, the line frequency of the first detection device 111 is 15k~25k times/second; the flash frequency of the first stroboscopic light source 121 is 30k~50k times/second; the flash frequency of the second stroboscopic light source 122 is 30k~50k times/second.

In this embodiment, the light emitting surface of the first stroboscopic light source 121 is a plane. The processing cost of a plane light source is low, which can reduce the cost of the detection equipment. In other embodiments, the light emitting surface of the first stroboscopic light source can be a curved surface.

Specifically, the object to be tested 110 is a mobile phone case. In other embodiments, the object to be tested may be a flat glass.

The detection device also includes: a processing system for extracting the first detection of the first signal light and the second signal light respectively according to the first detection information of the first detection device 111 at different times to form a first image and a second image; a control device for sending a first stroboscopic trigger signal to the first stroboscopic light source 121 and the first detection device 111, and sending a second stroboscopic trigger signal to the second stroboscopic light source 122 and the second detection device 112.

The processing system is used to acquire first detection information of the first signal light according to the trigger time of the first stroboscopic trigger signal to form a first image, and to acquire first detection information of the second signal light according to the trigger time of the second stroboscopic trigger signal to form a second image.

The trigger time refers to the time when the light source emits detection light or the detection device acquires the first detection information.

In this embodiment, the moving device includes multiple conveyor belt devices 100, and the multiple conveyor belt devices 100 are used to move the object to be tested 110 along the same conveying direction; there are gaps between adjacent conveyor belt devices 100, and the moving device is used to transfer the object to be tested 110 from one conveyor device 100 to another conveyor device 100 across the gaps.

The minimum distance between the contact points between adjacent conveyor belt devices 100 and the object to be measured 110 is less than half of the dimension of the object to be measured along the conveying direction.

In this embodiment, the conveyor device 100 has one or more gaps, which include a first gap. The second stroboscopic light source 122 is located on a side of the carrying surface close to the conveyor device. The second detection light is used to pass through the first gap to reach the object to be detected 110.

In this embodiment, the second stroboscopic light source 122 is a backlight source and is located on the side of the carrying surface close to the mobile device. The second detection light passes through the first gap, irradiates the second surface of the object under test 110, and passes through the object under test 110 to form a second signal light, which is received by the first detection device 111.

The conveyor belt device 100 includes two rotating wheels 101 and a conveyor belt 102. The conveyor belt 102 is wound around the rotating wheels 101, and the rotating wheels 101 drive the conveyor belt 102 to rotate. When the object to be tested 110 is tested, the object to be tested 110 is placed on the conveyor belt 102. When the rotating wheels 101 rotate, the conveyor belt 102 drives the object to be tested 110 to move along the conveying direction.

If the aspect ratio of the gap between adjacent conveyor belt devices 100 is too large, the second detection light is easily blocked; if the aspect ratio between adjacent conveyor belt devices 100 is too small, the distance between adjacent conveyor belt devices 100 is too large, and the object to be tested 110 is easy to slide from the gap; if the rotation rate radius is small and the curvature is large, it is easy to cause the surface of the conveyor belt 102 in contact with the object to be tested 110 to be uneven. Specifically, in this embodiment, the minimum distance between adjacent conveyor belt devices 100 is 40mm~55mm, for example 45mm; the diameter of the rotating wheel 101 is 13mm~17mm, for example 15mm; the diameter of the belt is 1.5mm~2.5mm, for example 2mm.

The first detection device 111 includes an objective lens and an image sensor. The objective lens is used to collect the first signal light and the second signal light, and converge the first signal light and the second signal light onto the image sensor; the image sensor is used to obtain first detection information according to the first signal light and the second signal light.

In this embodiment, the second stroboscopic light source 122 is a backlight source, and the central axis of the second detection light is parallel to the optical axis of the objective lens of the first detection device 111. Since the first stroboscopic light source 121 is a bright field light source, the first detection device 111 and the first stroboscopic light source 121 are respectively located on both sides of a plane perpendicular to the transmission direction, and the acute angle between the central axis of the first detection light and the plane perpendicular to the transmission direction is equal to the acute angle between the optical axis of the objective lens of the first detection device 111 and the plane perpendicular to the transmission direction.

In this embodiment, the object to be tested 110 is a mobile phone case or a flat glass.

In other implementations, the acute angle between the central axis of the first detection light and the plane perpendicular to the transmission direction is adjustable; the acute angle between the objective lens optical axis of the first detection device and the plane perpendicular to the transmission direction is adjustable.

If the acute angle between the center line of the second detection light and the plane perpendicular to the transmission direction is too large, the second detection light is easily blocked by the conveyor belt device 100; if the acute angle between the center line of the second detection light and the plane perpendicular to the transmission direction is too small, the second detection light and the second signal light are easily blocked by the first stroboscopic light source 121. Specifically, in this embodiment, the acute angle between the center line of the second detection light and the plane perpendicular to the transmission direction is 25° to 35°.

In other embodiments, the acute angle between the center line of the second detection light and the plane perpendicular to the transmission direction is adjustable.

2 and 3 are schematic structural diagrams of another embodiment of the detection device of the present invention.

Please refer to FIG. 2 and FIG. 3 , FIG. 3 is a side view of a portion of area 1 in FIG. 2 along the x direction.

The similarities between this embodiment and the previous embodiment are not described in detail here, and the differences include:

In this embodiment, the detection device further includes: a first illumination light source 131, wherein the first illumination light source 131 is an arc-shaped light source, the light emitting surface of the arc-shaped light source is an arc surface, and the arc surface of the arc-shaped light source is concave in a direction away from the bearing surface;

The first illumination light source 131 is configured to emit a fourth detection light to the object under test 110, and the fourth detection light is reflected by the object under test 110 to form a fourth signal light. The first illumination light source 131 and the first stroboscopic light source 121 are respectively used to illuminate two opposite surfaces of the object under test 110; the second detection device 112 is used to detect the fourth signal light to obtain second detection information.

Specifically, in this embodiment, the object to be tested 110 includes a first surface and a second surface relative to each other, the first surface and the second surface are arc surfaces; the first surface is a concave surface, that is, the first surface is concave toward the second surface; the second surface is a convex surface, that is, the second surface protrudes in a direction away from the first surface.

In this embodiment, the light emitting surface of the first stroboscopic light source 121 is a plane, and the first stroboscopic light source 121 is used to illuminate the first surface, so as to detect the first surface.

The first illumination light source 131 is configured to provide detection light to the object to be tested having at least one curved detection surface, wherein the normal lines of at least two positions of the curved detection surface in the bending direction are not parallel;

The second detection device 112 is used to collect the reflected light of the detection light on the surface of the object to be detected that is continuous along the bending direction.

In this embodiment, the first stroboscopic light source 121 and the second illumination light source 141 can realize double-sided detection of the curved object to be tested 110 .

The first illumination light source 131 is an arc light source, which is used to illuminate the convex surface, so as to detect the convex surface. Since the first illumination light source 131 is an arc light source, the propagation direction of the fourth detection light emitted by the arc light source to the convex surface is different, which makes it easy to ensure that the fourth signal light formed by the fourth detection light after being reflected by the convex surface can be received by the second detection device 112, so that the convex surface can be detected.

There is a first acute angle between the optical axis of the lens of the second detection device 112 and the plane perpendicular to the transmission direction. The fourth detection light emitted by the first illumination light source 131 has a symmetry plane, and there is a second acute angle between the symmetry plane and the plane perpendicular to the transmission direction, and the second acute angle is equal to the first acute angle.

In this embodiment, the one or more gaps further include a second gap.

In this embodiment, at least part of the first illumination light source 131 and the second detection device 112 are located on a side of the carrying surface close to the moving device. The fourth detection light passes through the second gap and is incident on the surface of the object to be detected 110 .

If the first acute angle is too large, it is easy to be blocked by the mobile device; if the first acute angle is too small, it is not conducive to the installation of the second detection device 112 and the first illumination light source 131. Specifically, the first acute angle is 10° to 20°.

In this embodiment, the light emitting surface of the first illumination light source 131 is a continuous curved surface, that is, the first illumination light source 131 has no opening in the middle, so the first illumination light source 131 can provide the object to be detected 110 with fourth detection light of relatively uniform intensity, thereby improving detection accuracy.

FIG. 4 is a schematic structural diagram of a third embodiment of a detection device of the present invention.

Please refer to FIG. 4 . The similarities between this embodiment and the embodiments shown in FIG. 2 and FIG. 3 are not described in detail here. The differences include:

In this embodiment, the detection device further includes: a second illumination light source 141, used for emitting a sixth detection light to the object to be detected 110, the sixth detection light forms a sixth signal light through the object to be detected 110; a fourth detection device 113, used for detecting the sixth signal light to obtain fourth detection information.

The third illumination light source 142 is used to emit seventh detection light to the object to be measured 110, and the seventh detection light forms seventh signal light through the object to be measured 110; the fifth detection device 114 is used to detect the seventh signal light to obtain fifth detection information.

In this embodiment, the first stroboscopic light source 121 is a bright field light source; the second stroboscopic light source 122 is a backlight source; the second illumination light source 141 is a dark field light source, and the six signal lights are scattered lights formed by the sixth detection light being scattered by the object to be measured 110. The first illumination light source 131 is a bright field light source, and the third illumination light source 142 is a dark field light source. In other embodiments, the first stroboscopic light source is a dark field light source, the second stroboscopic light source is a backlight source, and the second illumination light source is a bright field light source; or, the first stroboscopic light source is a bright field light source, the second stroboscopic light source is a dark field light source, the second illumination light source is a backlight source, and the third illumination light source is a dark field light source.

Specifically, the second illumination light source 141 is used to emit a sixth detection light to the third gap, and the sixth detection light is scattered by the object to be detected 110 to form a sixth signal light;

The fourth detection device 113 is used to detect the sixth signal light to obtain fourth detection information;

A third illumination light source 142 is used to emit a seventh detection light to the third gap, and the seventh detection light is scattered by the object to be measured to form a seventh signal light. The third illumination light source 142 and the second illumination light source 141 are used to illuminate two opposite surfaces of the object to be measured 110 respectively;

The fifth detection device 114 is used to detect the seventh signal light to obtain fourth detection information.

This embodiment can realize bright field and dark field detection on both sides of the object to be tested 110, as well as backlight detection, so that multi-channel detection can be performed on the object to be tested 110, thereby improving the detection accuracy and reducing the missed detection of defects.

In this embodiment, the number of the second illumination light source 141 and the third illumination light source 142 is one. In other embodiments, when the second illumination light source is a dark field light source, the number of the second illumination light sources may be multiple, and the propagation directions of the sixth detection light emitted by the multiple second illumination light sources are different. When the third illumination light source is a dark field light source, the number of the third illumination light sources may be multiple, and the propagation directions of the seventh detection light emitted by the multiple third illumination light sources are different.

In this embodiment, the propagation direction of the sixth detection light is perpendicular to the carrying surface; an acute angle is formed between the optical axis of the lens of the fourth detection device 113 and the plane perpendicular to the transmission direction. An acute angle is formed between the propagation direction of the seventh detection light and the plane perpendicular to the transmission direction, and the optical axis of the lens of the fifth detection device 114 is parallel to the normal of the carrying surface.

FIG. 5 is a schematic structural diagram of a fourth embodiment of a detection device according to the present invention.

Please refer to FIG. 5 . The same aspects as those of the embodiment shown in FIG. 1 are not described in detail here. The differences include:

In this embodiment, the second stroboscopic light source 221 is a dark field light source. In other embodiments, the second stroboscopic light source may be a backlight source.

In this embodiment, the detection device also includes a third stroboscopic light source 222, which is configured to emit a third detection light to the object under test 110, and the third detection light forms a third signal light through the object under test 110. The first light source, the second light source and the third light source are configured to alternately emit the first detection light, the second detection light and the third detection light to the object under test 110 for multiple times; the first detection device 111 is also configured to detect the third detection light.

In this embodiment, the third stroboscopic light source 222 is a dark field light source. There are one or more third stroboscopic light sources 222 . The propagation directions of the detection lights emitted by the multiple dark field light sources are different.

The control device is further used for transmitting a third stroboscopic trigger signal to the third stroboscopic trigger source 222 and the first detection device 111 , and the triggering times of the first stroboscopic trigger signal, the second stroboscopic trigger signal and the third stroboscopic trigger signal are arranged alternately.

FIG. 6 is a schematic structural diagram of a fifth embodiment of a detection device according to the present invention.

Please refer to FIG. 6 . The similarities between this embodiment and the embodiment shown in FIG. 5 are not described in detail here. The differences include:

In this embodiment, the detection equipment also includes: a fourth stroboscopic light source 224, which is used to emit a fifth detection light to the object to be detected 110, and the fifth detection light forms a fifth signal light through the object to be detected 110, and the fourth stroboscopic light source 224 and the first stroboscopic light source 121 are respectively located on both sides of the carrying surface; a third detection device 211, which is used to detect the fifth signal light to obtain third detection information, and the third detection device 211 and the first detection device 111 are respectively located on both sides of the carrying surface.

The first stroboscopic light source 121 is located on the side of the carrying surface away from the mobile device, and the fourth stroboscopic light source 224 is located on the side of the carrying surface close to the mobile device. The fifth detection light passes through the first gap to illuminate the surface of the object to be detected 110 .

The first detection device 111 and the second detection device 112 at least partially overlap in the detection area of the carrying surface.

In this embodiment, the first stroboscopic light source 121, the second stroboscopic light source 221, the third stroboscopic light source 222 and the fourth stroboscopic light source 224 alternately emit detection light to the object to be detected 110. The first detection device 111 performs a shooting process when any stroboscopic light source emits light, and obtains corresponding first detection information; the third detection device 211 performs a shooting process when any stroboscopic light source emits light, and obtains corresponding third detection information.

In this embodiment, the control device is further used to send a fourth stroboscopic trigger signal to the fourth stroboscopic light source 224 and the first detection device 111, and the triggering times of the first stroboscopic trigger signal, the second stroboscopic trigger signal, the third stroboscopic trigger signal and the fourth stroboscopic trigger signal are arranged alternately. When the third stroboscopic light source 222 does not exist, the third stroboscopic trigger signal is not sent.

In this embodiment, the control device is further used to send a first strobe trigger signal, a second strobe trigger signal, a third strobe trigger signal and a fourth strobe trigger signal to the second detection device 112 .

In this embodiment, the wavelengths of all the detection lights are the same. Specifically, the wavelengths of the first detection light, the second detection light, the third detection light and the fourth detection light are the same.

In this embodiment, the first detection device 111 is further used to detect the fifth signal light that passes through the object to be detected 110 ; the second detection device 112 is further used to detect the first signal light, the second signal light and the third signal light that pass through the object to be detected 110 .

In this embodiment, the fifth signal light detected by the third detection device 211 is the scattered light formed by the fifth detection light being scattered by the object to be detected. The number of the fourth stroboscopic light sources 224 is one or more. In other embodiments, the fifth signal light detected by the third detection device 211 is the reflected light formed by the fifth detection light being reflected by the object to be detected.

In this embodiment, the frequency at which the first detection device 111 acquires the first detection information is greater than or equal to the sum of the flash frequencies of the first stroboscopic light source 121, the second stroboscopic light source 221, the third stroboscopic light source 222, and the fourth stroboscopic light source 224. When the detection device does not include the third stroboscopic light source 222, the frequency at which the first detection device 111 acquires the first detection information is greater than or equal to the sum of the flash frequencies of the first stroboscopic light source 121, the second stroboscopic light source 221, and the fourth stroboscopic light source 224.

In other embodiments, the detection device may not include the third stroboscopic light source 222, and the first stroboscopic light source 121, the second stroboscopic light source 221 and the fourth stroboscopic light source 224 repeatedly and alternately emit detection light to the object to be detected 110. The wavelengths of the first detection light, the second detection light and the fourth detection light are the same. The first detection device 111 is also used to detect the fifth signal light; the third detection device 211 is also used to detect the first signal light and the second signal light.

In another implementation, the wavelengths of the first detection light and the fifth detection light are different, and the wavelengths of the second detection light and the fifth detection light are different. The first detection device 111 includes a first filter component for filtering out the fifth signal light; the third detection device 211 includes a second filter component for filtering out the first signal light and the second signal light. When the detection device includes a third stroboscopic light source 222, the second filter component is also used to filter out the third signal light.

The first optical filter component includes one or more combinations of an optical filter and a grating; the second optical filter component includes one or more combinations of an optical filter and a grating.

The first stroboscopic light source 121 and the second stroboscopic light source 221 repeatedly and alternately emit detection light to the object under test 110, and the first detection device 111 repeatedly and alternately obtains the first signal light and the second signal light. When there are multiple fourth stroboscopic light sources 224, the multiple fourth stroboscopic light sources 224 repeatedly and alternately emit the fifth detection light to the object under test 110. The fourth stroboscopic light source 224 and the first stroboscopic light source 121, the second stroboscopic light source 221 or the third stroboscopic light source 222 can emit detection light simultaneously.

Specifically, the control device is used to send a first stroboscopic trigger signal to the first stroboscopic light source 121 and the first detection device 111, send a second stroboscopic trigger signal to the second stroboscopic light source 221 and the first detection device 111, and send a fourth stroboscopic trigger signal to the fourth stroboscopic light source 224 and the second detection device 112. When the third stroboscopic light source 222 exists, the control device is also used to send a third stroboscopic trigger signal to the third stroboscopic light source 222 and the first detection device 111.

The processing system acquires a first image according to the trigger time of the first stroboscopic trigger signal and the first detection information of the first detection device 111; acquires a second image according to the trigger time of the second stroboscopic trigger signal and the first detection information of the first detection device 111; acquires a third image according to the trigger time of the third stroboscopic trigger signal and the first detection information of the first detection device 111; and acquires a fourth image according to the trigger times of multiple different fourth stroboscopic trigger signals and the third detection information of the third detection device 211.

The frequency of the first detection device 111 acquiring detection information is greater than or equal to the sum of the first stroboscopic light source 121, the second stroboscopic light source 221 and the third stroboscopic light source 222; when the third stroboscopic light source 222 does not exist, the frequency of the first detection device 111 acquiring detection information is greater than or equal to the sum of the flash frequencies of the first stroboscopic light source 121 and the second stroboscopic light source 221. The frequency of the third detection device 211 acquiring detection information is greater than or equal to the flash frequency of the fourth stroboscopic light source 224.

In this embodiment, the frequency at which the first detection device 111 acquires detection information is the frequency at which the first detection device 111 takes images; the frequency at which the third detection device 211 acquires detection information is the frequency at which the third detection device 211 takes images.

The triggering time of the fourth stroboscopic trigger signal can partially or completely overlap with the triggering time of the first stroboscopic trigger signal, the second stroboscopic trigger signal and the third stroboscopic trigger signal, so that the detection information of different detection channels can be obtained at the same time, and the detection speed can be improved. At the same time, the frequency of the first detection device 111 taking images can be low, so that the exposure time of the taken images can be increased, thereby increasing the clarity of the image and improving the detection accuracy.

FIG. 7 is a flow chart of the steps of an embodiment of a detection method of the present invention.

Referring to FIG. 7 , an embodiment of the present invention further provides a detection method, including:

Step S01, placing the object to be tested on the carrying surface of the testing equipment.

Step S02, emitting a first detection light and a second detection light to the object to be tested alternately multiple times by a first stroboscopic light source and a second stroboscopic light source, wherein the first detection light forms a first signal light after passing through the object to be tested, and the second detection light forms a second signal light after passing through the object to be tested;

Step S03: using a first detection device to detect the first signal light and the second signal light alternately for multiple times to obtain first detection information.

The detection method is described in detail below with reference to the accompanying drawings.

With reference to FIG. 4 , a test object 110 is provided, wherein the test object 110 includes a test area; and a detection device is provided.

In this embodiment, the object to be tested 110 is a curved or flat glass. Specifically, the object to be tested 110 is a mobile phone case. The object to be tested 110 includes a first surface and a second surface opposite to each other, the first surface is a concave surface, and the second surface is a convex surface. The second surface includes a plane and a curved surface connected to both ends of the plane.

Continuing with reference to FIG. 4 , step S01 is performed to place the object to be tested 110 on the carrying surface of the testing device.

In this embodiment, placing the object to be tested 110 on the carrying surface of the conveying device includes: making the second surface contact with the carrying surface. The contact between the second surface and the carrying surface can make the plane of the object to be tested 110 contact with the carrying surface, can stabilize the object to be tested 110, and reduce the deviation of the object to be tested 110 during the detection process.

4 , after the object to be tested 110 is placed on the carrying surface, the object to be tested 110 is moved relative to the first detection device 111 , the first stroboscopic light source 121 and the second stroboscopic light source 122 .

In this embodiment, the carrying device includes a moving device, and the moving device is used to drive the object to be detected 110 to move along the conveying direction. In other embodiments, the moving device can drive the first detection device, the first stroboscopic light source, and the second stroboscopic light source to move.

In this embodiment, the transmission device drives the object to be tested 110 to move along the transmission direction. When the object to be tested 110 reaches the second gap, the detection method further includes: causing the first illumination light source 131 to emit a fourth detection light to the object to be tested 110, the fourth detection light is reflected by the object to be tested 110 to form a fourth signal light; and detecting the fourth signal light by the third detection device 211 to obtain second detection information.

In this embodiment, the light-emitting surface of the first illumination light source 131 is arc-shaped, and at least part of the first illumination light source 131 and the second detection device 112 are located on the side of the bearing surface close to the second gap, and the light-emitting surface of the first illumination light source 131 is recessed in the direction away from the bearing surface, and the fourth signal light formed by reflection from the plane and the arc surface can be detected by the second detection device 112, so that bright field detection can be performed on the convex surface of the object to be measured 110.

The detection area of the second detection device 112 passes through the detection area along the vertical transmission direction. Therefore, after the object to be detected 110 passes through the second gap, the detection device can detect the entire second surface of the detection area.

During the process of detecting the object to be detected 110 , the object to be detected 110 moves relative to the first illumination light source 131 and the second detection device 112 .

When the object to be measured 110 reaches the third gap, the detection method further includes: enabling the second illumination light source 141 to emit a sixth detection light to the object to be measured 110, and the sixth detection light forms a sixth signal light through the object to be measured 110; detecting the sixth signal light by the fourth detection device 113 to obtain fourth detection information; enabling the third illumination light source 142 to emit a seventh detection light to the object to be measured 110, and the seventh detection light forms a seventh signal light through the object to be measured 110; detecting the seventh signal light by the fifth detection device 114 to obtain fifth detection information.

In this embodiment, the sixth signal light is the scattered light formed by the fifth detection light being scattered by the first surface of the object to be tested 110; the seventh signal light is the scattered light formed by the seventh detection light being scattered by the second surface of the object to be tested 110. After the object to be tested 110 passes through the third gap, dark field detection of the first surface and the second surface of the test area can be achieved.

Continuing with reference to FIG4 , step S02 is performed, wherein the first stroboscopic light source 121 and the second stroboscopic light source 122 are used to alternately emit the first detection light and the second detection light to the object under test 110 for multiple times, wherein the first detection light forms a first signal light through the object under test 110, and the second detection light forms a second signal light through the object under test 110; step S03 is performed, wherein the first detection device 111 is used to alternately detect the first signal light and the second signal light for multiple times to obtain first detection information.

The detection device includes a first stroboscopic light source 121 and a second stroboscopic light source 122. Since the first stroboscopic light source 121 and the second stroboscopic light source 122 are configured to emit the first detection light and the second detection light to the object to be detected 110 alternately for multiple times, and the first detection device 111 is configured to detect the first signal light and the second signal light alternately for multiple times, the first detection information obtained by the first detection device 111 according to the first signal light and the second signal light can be separated according to the detection time, and the first detection information of different channels can be obtained. Since there is no overlap in time, the detection accuracy can be improved. At the same time, the detection device can obtain the first detection information of the first signal light and the second signal light through a first detection device 111, so that the structure of the detection device can be simplified, the integration can be improved, and the cost can be reduced.

When the object to be detected 110 reaches the first gap, the first detection light and the second detection light are emitted to the object to be detected 110 .

Multiple times of alternately emitting the first detection light and the second detection light to the object under test 110 by the first stroboscopic light source 121 and the second stroboscopic light source 122 include: sending a first stroboscopic trigger signal to the first stroboscopic light source 121 and the first detection device 111, and sending a second stroboscopic trigger signal to the second stroboscopic light source 122 and the second detection device 112 by the control device.

In this embodiment, the first signal light is the reflected light formed by the first detection light reflected by the first surface, and the first stroboscopic light source 121 and the first detection device 111 can realize bright field detection of the first surface. The second stroboscopic light source 122 is a backlight source, and the second stroboscopic light source 122 and the first detection device 111 can realize backlight detection of the object to be detected 110.

The detection method further includes extracting first detection information of the first signal light and the second signal light respectively according to first detection information of the first detection device 111 at different times by a processing system to form a first image and a second image.

Specifically, forming the first image and the second image includes: acquiring first detection information of the first signal light according to the trigger time of the first stroboscopic trigger signal to form the first image; acquiring first detection information of the second signal light according to the trigger time of the second stroboscopic trigger signal to form the second image.

Specifically, forming the first image includes: acquiring the first detection information of the first detection device 111 according to the trigger time of the first stroboscopic trigger signal, and splicing it to form the first image; forming the second image includes: acquiring the first detection information of the first detection device 111 according to the trigger time of the second stroboscopic trigger signal, and splicing it to form the second image.

With reference to FIG6 , another detection method is also provided in the embodiment of the present invention.

The similarities between the detection method of this embodiment and the previous embodiment are not described in detail here, and the differences include:

Alternatingly emitting the first detection light and the second detection light to the object to be tested for multiple times includes: causing the first stroboscopic light source 121, the second stroboscopic light source 221, and the fourth stroboscopic light source 224 to alternately emit the detection light to the object to be tested 110 for multiple times;

Acquiring the first detection information includes: alternately detecting the first signal light, the second signal light, the third signal light and the fifth signal light multiple times by the first detection device 111. When the third stroboscopic light source does not exist, the third signal light is not detected.

The detection method further includes: acquiring third detection information by alternately detecting the first signal light, the second signal light, the third signal light and the fifth signal light multiple times by the third detection device 211. When the third stroboscopic light source does not exist, the third signal light is not detected.

The detection method further includes: sending a first stroboscopic trigger signal, a second stroboscopic trigger signal, and a third stroboscopic trigger signal to the third detection device 211, so that the third detection device 211 obtains fourth detection information according to the first stroboscopic trigger signal, the second stroboscopic trigger signal, and the third stroboscopic trigger signal. When the third stroboscopic light source 222 does not exist, the third stroboscopic trigger signal is not sent.

In this embodiment, the detection method further includes: sending a fourth stroboscopic trigger signal to the third detection device 211 and the fourth stroboscopic light source 224, so that the third detection device 211 obtains third detection information according to the fourth stroboscopic trigger signal.

In this embodiment, the detection method further includes: sending a fourth stroboscopic trigger signal to the first detection device 111; sending a first stroboscopic trigger signal, a second stroboscopic trigger signal and a third stroboscopic trigger signal to the third detection device 211. When the third stroboscopic light source 222 does not exist, the third stroboscopic trigger signal is not sent.

The triggering times of the first stroboscopic trigger signal, the second stroboscopic trigger signal, the third stroboscopic trigger signal and the fourth stroboscopic trigger signal are arranged alternately in sequence. The first stroboscopic light source 121, the second stroboscopic light source 221, the third stroboscopic light source 222 and the fourth stroboscopic light source 224 emit detection light to the object to be measured 110 alternately in sequence, and each time the light source emits detection light, the first detection device 111 and the third detection device 211 detect the signal light to obtain the first detection information and the third detection information.

In this embodiment, during the detection of the object 110 by the first detection device 111 and the third detection device 211 , the object 110 moves relative to the first detection device 111 , the third detection device 211 , the first stroboscopic light source 121 , the second stroboscopic light source 221 and the fourth stroboscopic light source 224 .

The detection areas of the first detection device 111 and the third detection device 211 overlap.

The first stroboscopic light source 121 , the second stroboscopic light source 221 , the third stroboscopic light source 222 and the fourth stroboscopic light source 224 sequentially and alternately emit detection light to the object to be detected 110 to the first detection device 111 to obtain detection information of the first surface of the entire test area.

In other embodiments, the first strobe trigger signal, the second strobe trigger signal and the third strobe trigger signal are only sent to the first detection device 111; the fourth strobe trigger signal is only sent to the third detection device 211. The triggering time of the fourth strobe trigger signal may partially or completely overlap with the first strobe trigger signal, the second strobe trigger signal or the third strobe trigger signal. That is, the fourth strobe light source 224 may partially or completely overlap with the time when the first strobe light source 121, the second strobe light source 221 or the third strobe light source 222 emits detection light. When there are multiple fourth strobe light sources 224, the multiple fourth strobe light sources 224 alternately emit detection light to the object to be measured 110 multiple times.

The first filter component can filter out the fifth signal light, thereby improving detection accuracy. The second filter component can filter out the first signal light, the second signal light and the third signal light, thereby improving detection accuracy.

In this embodiment, different objects to be detected can be detected at the first gap, the second gap, and the third gap at the same time.

Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims (16)

1. A testing device, comprising a bearing surface for placing an object to be tested, characterized in that the testing device comprises: A first stroboscopic light source is configured to emit a first detection light to the object to be measured on the carrying surface, wherein the first detection light forms a first signal light through the object to be measured; A second stroboscopic light source is configured to emit a second detection light to the object to be tested on the carrying surface, the second detection light forms a second signal light through the object to be tested, and the first stroboscopic light source and the second stroboscopic light source are configured to emit the first detection light and the second detection light to the object to be tested alternately for multiple times; A first detection device is configured to detect the first signal light and the second signal light alternately for multiple times to obtain first detection information; The detection device further includes: a first illumination light source, the first illumination light source is an arc light source, the light emitting surface of the arc light source is an arc surface, and the arc surface of the arc light source is concave in a direction away from the bearing surface; The first illumination light source is configured to emit a fourth detection light to the convex surface of the object to be measured, and the fourth detection light is reflected by the object to be measured to form a fourth signal light, wherein the object to be measured includes a first surface and a second surface opposite to each other, the first surface is a concave surface, the second surface is a convex surface, and the second surface is in contact with the bearing surface; the second detection device is used to detect the fourth signal light to obtain second detection information; The detection device further comprises: a moving device, the moving device comprises a plurality of conveyor belt devices, the plurality of conveyor belt devices are used to move the object to be detected along the same conveying direction, the bearing surface is located on the surface of the conveyor belt device; there is a gap between adjacent conveyor belt devices; the conveyor belt device has one or more gaps, the one or more gaps include a second gap, and during detection, the object to be detected is located on the bearing surface and spans the second gap; The fourth detection device and at least part of the first illumination light source are located on the side of the bearing surface close to the second gap, and the fourth detection light is used to pass through the second gap to reach the surface of the object to be detected; The first stroboscopic light source is a bright field light source, and the second stroboscopic light source is a dark field light source or a backlight source; or, the first stroboscopic light source and the second stroboscopic light source are both dark field light sources, and the propagation directions of the first detection light and the second detection light are different; or, the second stroboscopic light source is a bright field light source, and the first stroboscopic light source is a dark field light source or a backlight source; The first illumination light source and the first stroboscopic light source are used to illuminate two opposite surfaces of the object to be measured respectively. 2 . The detection device as described in claim 1 , characterized in that the wavelengths of the first detection light and the second detection light are the same. 3. The detection device as described in claim 1 is characterized in that the detection device also includes a third stroboscopic light source, which is configured to emit a third detection light to the object to be detected, and the third detection light forms a third signal light through the object to be detected, and the first stroboscopic light source, the second stroboscopic light source and the third stroboscopic light source are configured to alternately emit the first detection light, the second detection light and the third detection light to the object to be detected multiple times; the first detection device is also configured to detect the third detection light; the third stroboscopic light source is a dark field light source, the number of the third stroboscopic light sources is one or more, and the propagation directions of the detection lights emitted by the multiple dark field light sources are different. 4. The detection equipment as described in claim 1 is characterized in that the first stroboscopic light source and the second stroboscopic light source are linear light sources, and the extension direction of the light spots formed by the first stroboscopic light source and the second stroboscopic light source on the surface of the object to be tested is perpendicular to the transmission direction, and the light spots pass through the test area of the object to be tested along the transmission direction. 5. The detection equipment as described in claim 1 is characterized in that the frequency of the first detection device is 15k to 25k times/second; the flash frequency of the first stroboscopic light source is 30k to 50k times/second; and the flash frequency of the second stroboscopic light source is 30k to 50k times/second. 6 . The detection device according to claim 1 , wherein the first stroboscopic light source is a bright field light source, and the light-emitting surface of the first stroboscopic light source is a plane or a curved surface. 7. The detection device according to claim 1, characterized in that the first stroboscopic light source is a bright field light source, the second stroboscopic light source is a backlight source; the one or more gaps include a third gap; the detection device further comprises: A second illumination light source is used to emit a sixth detection light to the third gap, wherein the sixth detection light is scattered by the object to be detected to form a sixth signal light; a fourth detection device, used for detecting the sixth signal light to obtain fourth detection information; A third illumination light source is used to emit a seventh detection light to the third gap, the seventh detection light is scattered by the object to be measured to form a seventh signal light, and the third illumination light source and the second illumination light source are used to illuminate two opposite surfaces of the object to be measured respectively; The fifth detection device is used to detect the seventh signal light to obtain fourth detection information. 8. The detection device as described in claim 1 is characterized in that it also includes: a processing system for extracting the first detection information of the first signal light and the second signal light respectively according to the first detection information of the first detection device at different times to form the first image and the second image. 9. The detection device according to claim 8, characterized in that it also includes: a control device for sending a first stroboscopic trigger signal to the first stroboscopic light source and the first detection device, and sending a second stroboscopic trigger signal to the second stroboscopic light source and the first detection device, wherein the triggering times of the first stroboscopic trigger signal and the second stroboscopic trigger signal are alternately arranged; The processing system is used to acquire first detection information of the first signal light according to the trigger time of the first stroboscopic trigger signal to form a first image, and to acquire first detection information of the second signal light according to the trigger time of the second stroboscopic trigger signal to form a second image. 10. The detection equipment as described in claim 1 is characterized in that it also includes: a fourth stroboscopic light source, used to emit a fifth detection light to the object to be detected, the fifth detection light forms a fifth signal light through the object to be detected, and the fourth stroboscopic light source and the first stroboscopic light source are respectively located on both sides of the carrying surface; a third detection device, used to detect the fifth signal light to obtain third detection information, and the third detection device and the first detection device are respectively located on both sides of the carrying surface. 11. The detection device according to claim 10, characterized in that the first stroboscopic light source, the second stroboscopic light source and the fourth stroboscopic light source are used to alternately emit detection light to the object to be detected; Alternatively, the wavelength of the fourth detection light is different from that of the first detection light, and the wavelength of the fourth detection light is different from that of the second detection light; the first detection device includes a first filter component for filtering out the fourth signal light; and the third detection device includes a second filter component for filtering out the first signal light and the second signal light. 12. A detection method based on the detection device according to any one of claims 1 to 11, characterized in that it comprises: Place the object to be tested on the carrying surface of the testing equipment; The first detection light and the second detection light are emitted alternately to the object to be tested by a first stroboscopic light source and a second stroboscopic light source for multiple times, wherein the first detection light forms a first signal light after passing through the object to be tested, and the second detection light forms a second signal light after passing through the object to be tested; Alternately detecting the first signal light and the second signal light multiple times by a first detection device to obtain first detection information; When the detection device further comprises: a first illumination light source, the first illumination light source is an arc light source, the light emitting surface of the arc light source is an arc surface, and the arc surface of the arc light source is concave in a direction away from the bearing surface; the fourth detection light is used to pass through the second gap to reach the surface of the object to be detected; The object to be tested comprises a first surface and a second surface opposite to each other, the first surface is a concave surface, and the second surface is a convex surface; Placing the object to be tested on the carrying surface of the testing device includes: bringing the second surface into contact with the carrying surface. 13. The detection method as described in claim 12 is characterized in that when the detection equipment also includes a processing system, the detection method also includes: extracting the first detection information of the first signal light and the second signal light respectively according to the first detection information of the first detection device at different times through the processing system to form the first image and the second image. 14. The detection method according to claim 13, characterized in that when the detection device further includes a control device, emitting the first detection light and the second detection light to the object to be detected multiple times by the first stroboscopic light source and the second stroboscopic light source alternately comprises: sending a first stroboscopic trigger signal to the first stroboscopic light source and the first detection device by the control device; sending a second stroboscopic trigger signal to the second stroboscopic light source and the second detection device; Forming the first image and the second image includes: acquiring first detection information of the first signal light according to the trigger time of the first stroboscopic trigger signal to form the first image; acquiring first detection information of the second signal light according to the trigger time of the second stroboscopic trigger signal to form the second image. 15. The detection method according to claim 12, characterized in that when the detection device further comprises: a fourth stroboscopic light source and a third detection device; The method of multiple times alternately emitting the first detection light and the second detection light to the object to be measured comprises: causing the first stroboscopic light source, the second stroboscopic light source and the fourth stroboscopic light source to multiple times alternately emit detection light to the object to be measured, wherein the fourth stroboscopic light source is used to emit a fifth detection light to the object to be measured, and the fifth detection light forms a fifth signal light through the object to be measured; Acquiring the first detection information includes: alternately detecting the first signal light, the second signal light, and the fifth signal light multiple times by a first detection device; The detection method further includes: alternately detecting the first signal light, the second signal light and the fifth signal light multiple times by a third detection device to obtain third detection information. 16. The detection method according to claim 15, wherein the wavelength of the fifth detection light is different from that of the first detection light, and the wavelength of the fifth detection light is different from that of the second detection light; The detection method further includes: detecting the fifth signal light by a third detection device to obtain third detection information; and the time when the third detection device detects the fifth signal light partially or completely overlaps with the time when the first detection device detects the first signal light or the second signal light.