TWI806430B - Defect detection method and defect detection device - Google Patents

Abstract

A defect detection method includes the following steps: making a defect detection device distance from a tested object by a first distance, and executing long distance detection on the tested object by a camera of a detection device; obtaining at least one suspicious area on the tested object according to the result of the long distance detection; moving the defect detection device near the at least one suspicious area, and distancing from the at least one suspicious area of the tested object by a second distance, wherein the second distance is smaller the first distance, and executing close-up detection on the tested object by a camera of a detection device.

Description

Defect detection method and defect detection device

The present invention relates to a detection method and a detection device, in particular to a defect detection method and a defect detection device.

Generally speaking, there are often small defects in fan blades that are difficult to distinguish with the naked eye (such as small cracks on the surface of the blade or flaws under the surface of the blade), and if these small defects cannot be detected immediately, they may deteriorate from small defects to big problems. As a result, the maintenance organization needs to spend more money and time to repair the fan blades. However, it is still difficult to efficiently find small defects that are difficult to distinguish with the naked eye in the defect detection of fan blades. Therefore, how to further improve the accuracy and efficiency of defect detection of fan blades has become a major design issue.

The present invention provides a defect detection method and a defect detection device, so as to improve the accuracy and efficiency of defect detection of fan blades.

A defect detection method disclosed in an embodiment of the present invention includes the following steps. Make a defect detection device a first distance away from an item to be tested, and pass through the defect detection device One of the shooting lens groups performs a long-distance detection on the object to be tested. At least one suspicious region on the object to be tested is obtained according to the remote detection result. Make the defect detection device move to at least one suspicious area, and a second distance away from at least one suspicious area of the object to be tested, the second distance is smaller than the first distance, and take a close-up shot of the object to be tested through the camera lens group of the defect detection device detection.

The defect detection device disclosed in another embodiment of the present invention is used for detecting an item to be tested. The defect detection device includes a flying body, a photographing mirror group, a spraying component, an early warning receiver and a processor. The shooting mirror assembly is arranged on the flight body. The spray assembly includes a liquid storage container, a spray head and a fluid driver. The liquid storage container is installed on the aircraft body and used for storing a liquid. The spray head is communicated with the liquid storage container. The fluid driver is installed in the liquid storage container and is used to make the liquid stored in the liquid storage container spray out from the spray head. The early warning receiver is installed on the body and used to receive at least one wind shear early warning signal. The processor adjusts the position of the flying body according to at least one wind shear warning signal.

According to the flaw detection method and flaw detection device of the above-mentioned embodiments, the object to be tested is firstly inspected remotely, and then close-up detection is performed on suspicious areas based on the screening results of the remote inspection, which can effectively improve the efficiency and accuracy of flaw detection .

In addition, by installing a spraying component on the defect detection device, volatile liquid can be sprayed on suspicious areas during close-up detection to improve the accuracy and probability of defect detection.

The above description of the content of the present invention and the following description of the implementation are used to demonstrate and explain the principle of the present invention, and provide further explanation of the patent application scope of the present invention.

10: Defect detection device

20: Items to be tested

22: Suspicious area

30: Another Drone

40: Ground Monitoring Station

100: flight body

110: Fuselage

120: spiral blade

130: Protective parts

200: Shooting lens group

210:Visible light lens

220: thermal imaging lens

300: spraying components

310: liquid storage container

320: fluid drive

330: Nozzle

340: block

400: early warning receiver

500: Processor

600: tripod

610: first extension

620: second extension

630: The third extension

700: parachute

S100~S330: steps

D1: first distance

D2: second distance

D3: Distance

FIG. 1 is a schematic plan view of a defect detection device according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view of the remote inspection performed by the defect inspection device in FIG. 1 .

FIG. 3 is a schematic plan view of the close-up detection performed by the defect detection device in FIG. 1 .

FIG. 4 and FIG. 5 are schematic flowcharts of the defect detection method executed by the defect detection device in FIG. 1 .

6 to 9 are schematic diagrams of simulated images of the close-up detection of the first suspicious area performed by the defect detection device in FIG. 1 .

10 to 12 are schematic diagrams of simulated images of the close-up detection of the second suspicious area performed by the defect detection device in FIG. 1 .

See Figures 1 through 3. FIG. 1 is a schematic plan view of a defect detection device 10 according to a first embodiment of the present invention. FIG. 2 is a schematic plan view of the remote detection performed by the defect detection device 10 in FIG. 1 . FIG. 3 is a schematic plan view of the close-up detection performed by the defect detection device 10 in FIG. 1 .

The defect detection device 10 of this embodiment is used to detect an object 22 to be tested. The object to be tested 22 is, for example, a fan blade of a wind generator 20 . The wind turbine blades may have surface defects or subsurface defects (hidden damage) due to the test of the environment. For example, the flaw detection device 10 can fly to a high altitude, and detect surface flaws or subsurface flaws (hidden flaws) of the fan blade through image changes.

In this embodiment, the defect detection device 10 includes, for example, an aircraft body 100 , a camera lens assembly 200 , a spraying assembly 300 , an early warning receiver, and a processor 500 . The flying body 100 is, for example, an unmanned aerial vehicle, and includes a fuselage 110 , a plurality of spiral blades 120 and two protective pieces 130 . Some helical blades 120 are disposed on the fuselage 110 . When the spiral blade 120 rotates, it can drive the fuselage 110 to fly. The protection member 130 is, for example, a mesh structure or a baffle structure. The two protective parts 130 are disposed on the fuselage 110 and respectively located on one side of the two helical blades 120 on the front side of the fuselage 110 to protect the two helical blades 120 on the front side of the fuselage 110 from collision. Generally speaking, since the helical blade 120 is often impacted by external objects, the protective member 130 is usually disposed on the outer side of the helical blade 120 so that the protective member 130 can protect the helical blade 120 in a focused manner. However, the form, shape and position of the guard 130 are not intended to limit the present invention. In other embodiments, the protective member may also be in the shape of a ring and surround the helical blade to provide more complete protection for the helical blade.

In this embodiment, there are two protective parts 130 , which are respectively located at the front side of the fuselage 110 to protect the two helical blades 120 at the front side of the fuselage 110 from collisions, but the invention is not limited thereto. In other embodiments, the number of guards can also be changed to a single one, or the number of guards can also be changed to match the number of helical blades. That is, each helical blade is provided with a protective piece, so that the protective piece can prevent each helical blade from being collided.

The shooting lens group 200 is installed on the flying body 100 through a three-axis stabilized gimbal, for example, and includes a visible light lens 210 and a thermal image lens 220 . The visible light lens 210 and the thermal image lens 220 are used, for example, to photograph the object under test 22 to judge the damage condition of the object under test 22 through the real-time image of the object under test 22 . For example, if the defect detection device 10 is far away from the object 22 to be tested, a long-distance detection can be performed on the object 22 to be tested through the high-magnification visible light lens 210 . Conversely, if the defect detection device 10 is closer to the object 22 to be tested, it can pass through the heat The image lens 220 performs a close-up detection on the object 22 to be tested. The details of long-distance detection and close-up detection will be explained later.

The spray assembly 300 includes a liquid storage container 310 , a spray head 330 and a fluid driver 320 . The liquid storage container 310 is installed on the aircraft body 100 and used for storing a liquid (not shown). Liquids are, for example, volatile liquids. The spray head 330 communicates with the liquid storage container 310 . The fluid driver 320 is, for example, a pump, and is installed in the liquid storage container 310 . When the fluid driver 320 is activated, the liquid stored in the liquid storage container 310 is sprayed from the spray head 330 so as to atomize the liquid and spray it on the surface of the object 22 to be tested.

In this embodiment, the spraying assembly 300 may also include two baffles, for example, which respectively cover the left and right sides of the spray head 330, so as to prevent the lateral airflow of the aircraft body 100 from affecting the accuracy of the spraying area of the spray head 330. . In this way, the spraying accuracy of the spray head 330 can be improved by blocking the left and right sides of the liquid outlet of the spray head 330 through the baffle.

In this embodiment, the number of blocking pieces is two, but it is not limited thereto. In other implementations, the number of baffles can also be changed to one, and the nozzle can be surrounded inside, or the number of baffles can also be changed to four, and they are respectively located on the top, bottom, left, and right sides of the nozzle, so as to prevent the flying body from flying The vertical airflow and lateral airflow at the time affect the accuracy of the spraying area of the nozzle.

The early warning receiver is installed on the body and used to receive at least one wind shear early warning signal. The wind shear warning signal is, for example, wind speed information, wind direction information, or wind shear arrival time information, and is provided, for example, by another drone or a LiDAR device on a ground station.

The processor 500 adjusts the position of the flying body 100 according to at least one wind shear warning signal. For example, if the received wind shear warning signal is that the wind suddenly becomes stronger and will blow the defect detection device 10 to the object 22 to be tested, the processor 500 can make the defect detection device 10 and the object to be tested The distance of the object 22 is increased to prevent the defect detection device 10 from accidentally colliding with the object 22 to be tested and causing damage to the defect detection device 10 .

In this embodiment, the defect detection device 10 may further include a tripod 600 . The stand 600 includes, for example, a first extension part 610 , a second extension part 620 and a third extension part 630 . The first extension portion 610 and the second extension portion 620 are connected to opposite sides of the third extension portion 630 respectively, and jointly form a triangular structure. The first extension part 610 and the second extension part 620 are assembled on the flying body 100 . The structural strength of the stand 600 can be enhanced by the design of the third extension portion 630 connecting the first extension portion 610 and the second extension portion 620 . In this way, if the flying body 100 falls to the ground unexpectedly, the lens can be prevented from hitting the ground due to the damage of the first extension part 610 and the second extension part 620 .

In this embodiment, the defect detection device 10 may further include a parachute 700 , and the parachute 700 is installed on the flying body 100 to prevent accidents of the flying body 100 and allow the flying body 100 to land safely through the parachute 700 . For example, the defect detection device 10 can be equipped with a speed sensor, and judge whether the defect detection device 10 is in a stalled state through the speed information of the speed sensor. If the defect detection device 10 is in a stall state, the parachute 700 is opened to prevent accidents of the flying body 100 .

See Figures 2 through 5. 4 and 5 are schematic flow charts of the defect detection method executed by the defect detection device 10 in FIG. 1 .

First, as shown in FIG. 2 and step S100 of FIG. 4 , the photographing mirror group 200 of a defect detection device 10 is separated from an object 22 to be tested by a first distance D1, and treated through the photographing mirror group 200 of the defect detection device 10 The test item is subjected to a remote test. In detail, the first distance D1 is, for example, in the range of 50 to 150 meters, and photographs the object 22 to be tested, for example, through the visible light lens 210 of the photographing mirror assembly 200 .

Next, as shown in step S200 of FIG. 4 , the processor 500 obtains at least one suspicious region 24 on the object under test 22 according to the remote detection result.

Next, as shown in step S300 of FIG. 3 and FIG. 4 , the defect detection device 10 is moved to at least one suspicious area 24 , and the photographing lens group 200 of the defect detection device 10 is a distance from at least one suspicious area 24 of the object 22 to be tested. Two distance D2. The second distance D2 is smaller than the first distance D1, and a close-up detection is performed on the object to be tested through the camera lens group 200 of the defect detection device 10 . Specifically, the second distance D2 is, for example, between 2.5 and 5 meters, and the suspicious area 24 of the object under test 22 is photographed, for example, through the thermal imaging lens 220 of the photographing mirror assembly 200 . In addition, when the camera lens group 200 of the defect detection device 10 conducts close-up detection of the object to be tested, the distance D3 between the nozzle 330 and the suspicious area 24 is, for example, 0.5 to 1.5 meters to improve the accuracy of the spraying area of the nozzle 330 .

Please refer to FIG. 3 and FIG. 5 for detailed close-up detection steps. As shown in step S310 , before spraying liquid on the surface of the object 22 to be tested, the object 22 to be tested is first photographed to obtain at least one first thermal imaging image. Next, as shown in step S320 , a liquid is sprayed on the object 22 to be tested through the spray head 330 , and the object 22 to be tested is photographed after spraying the liquid, so as to obtain at least one second thermal imaging image. Next, as shown in step S330 , the defect detection is based on the comparison result of at least one first thermal imaging frame and at least one second thermal imaging frame.

Please refer to FIG. 6 to FIG. 9 . FIG. 6 to FIG. 9 are schematic diagrams of simulated images of the close-up detection of the first suspicious area 24 performed by the defect detection device 10 in FIG. 1 . In fact, when the defect detection device 10 performs close-up detection, the thermal imaging lens 220 will look at the suspicious area 24 of the object under test 22 Continuous shooting. In the initial stage of the continuous shooting period, the nozzle 330 does not spray liquid on the object 22 to be tested, so that the thermal imaging lens 220 can obtain a first thermal image image without spraying liquid (as shown in FIG. 6 ). In the middle and later stages of the continuous shooting period, the spray head 330 sprays the liquid on the suspicious area 24 of the object under test 22, for example, every preset time, so that the thermal imaging lens 220 can obtain the second thermal imaging image with the sprayed liquid (as shown in FIG. 7 to Figure 9). The preset time is, for example, 5 seconds, that is, the spray head 330 sprays on the suspicious area 24 every 5 seconds. The total time from the first spraying of the liquid to the last spraying of the liquid by the spray head 330 is, for example, 30-50 seconds. The spraying time of the spray head 330 each time is, for example, 0.5-2 seconds. As can be seen from Fig. 6 to Fig. 9, if the suspicious area 24 of the object to be tested 22 has damage, then under the influence of the liquid, the area with the condition in the second thermal imaging picture will become more and more obvious (such as the thin line frame selection) ). The situation shown in the images of FIGS. 6 to 9 is, for example, that the internal foam of the object under test 22 is damaged.

Please refer to FIG. 10 to FIG. 12 . FIG. 10 to FIG. 12 are schematic diagrams of simulated images of the close-up detection of the second suspicious area 24 performed by the defect detection device 10 in FIG. 1 . In fact, when the defect detection device 10 performs close-up detection, the thermal imaging lens 220 will continuously take pictures of the suspicious area 24 of the object 22 to be tested. In the initial stage of the continuous shooting period, the nozzle 330 does not spray liquid on the object 22 to be tested, so that the thermal imaging lens 220 obtains a first thermal image image without spraying liquid (as shown in FIG. 10 ). In the middle and late stages of the continuous shooting period, the spray head 330 sprays liquid on the suspicious area 24 of the object under test 22 at intervals of a preset time, so that the thermal imaging lens 220 can obtain a second thermal imaging image with sprayed liquid (as shown in FIG. 11 , shown in Figure 12). The preset time is, for example, 5 seconds, that is, the spray head 330 sprays on the suspicious area 24 every 5 seconds. The total time from the first spraying of the liquid to the last spraying of the liquid by the spray head 330 is, for example, 30-50 seconds. The spraying time of the spray head 330 each time is, for example, 0.5-2 seconds. It can be seen from Fig. 10 to Fig. 12 that if the suspicious area 24 of the object to be tested 22 is damaged, the area with the condition in the second thermal imaging picture under the influence of the liquid will become more and more obvious (such as the thin line frame selection) ). The situation shown in the images of FIGS. 10 to 12 is, for example, the occurrence of fine cracks on the surface of the object 22 to be tested.

Please refer to FIG. 3 again. During the close-up inspection of the object to be inspected by the camera lens group 200 of the defect detection device 10, the defect detection device 10 receives at least one wind shear from another drone 30 or a ground monitoring station 40, for example. The early warning signal allows the processor 500 to adjust the position of the defect detection device 10 according to the wind shear early warning signal. For example, assuming that the distance D3 between the UAV and the object 22 to be tested is 300 meters, and the wind speed is 30 meters per second, a wind shear warning signal of 10 seconds countdown to the wind shear impact can be sent to the defect detection device 10, And allow the operation defect detection device 10 to react in advance.

According to the flaw detection method and flaw detection device of the above-mentioned embodiments, the object to be tested is firstly inspected remotely, and then close-up detection is performed on suspicious areas based on the screening results of the remote inspection, which can effectively improve the efficiency and accuracy of flaw detection .

In addition, by installing a spraying component on the defect detection device, volatile liquid can be sprayed on suspicious areas during close-up detection to improve the accuracy and probability of defect detection.

Although the present invention is disclosed above with the foregoing embodiments, it is not intended to limit the present invention. Any person familiar with similar skills may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection for inventions shall be defined in the scope of patent application attached to this specification.

S100~S300: Steps

Claims (16)

A defect detection method, comprising: placing a defect detection device at a first distance from an object to be tested, and performing a remote detection on the object to be tested through a camera lens group of the defect detection device; according to the remote detection result Obtain at least one suspicious area on the item to be tested; move the defect detection device to the at least one suspicious area, and a second distance from the at least one suspicious area of the item to be tested, the second distance is smaller than the first distance; and performing a close-up inspection on the object under test through the shooting lens group of the defect detection device, including: photographing the object under test to obtain at least one first thermal imaging image; spraying a liquid, and after spraying the liquid, photograph the object to be tested to obtain at least one second thermal image; and based on the comparison result of the at least one first thermal image and the at least one second thermal image as Basis for defect detection. The defect detection method as described in claim 1, wherein the defect detection device receives at least one wind shear early warning signal during the close-up detection of the object to be tested through the camera lens group of the defect detection device, so as to The position of the defect detection device is adjusted according to the at least one wind shear warning signal. The defect detection method as described in Claim 1, wherein when the defect detection device performs the close-up detection, the distance between a nozzle of the defect detection device and the object to be tested is between 0.5 and 1.5 meters. The defect detection method as described in claim 1, wherein when the defect detection device performs the close-up detection, the distance between the camera lens group of the defect detection device and the object to be tested is 2.5 to 5 meters. The defect detection method as described in claim 1, wherein one of the nozzles of the defect detection device sprays the liquid on the object under test every preset time, and the preset time is 5 seconds. The defect detection method according to claim 1, wherein the total time from the first spraying of liquid to the last spraying of liquid by one of the nozzles of the defect detection device is 30 to 50 seconds. The defect detection method as described in Claim 1, wherein the time for each spraying of the liquid by one of the nozzles of the defect detection device is 0.5 to 2 seconds. The defect detection method as described in claim 1, wherein the photographing lens group includes a visible light lens and a thermal image lens, and when the defect detection device performs the remote detection, the object to be tested is detected through the visible light lens, the When the defect detection device performs the close-up detection, it detects the object to be tested through the thermal image lens. The defect detection method as described in Claim 1, wherein when the defect detection device performs the remote detection, the distance between the imaging lens group of the defect detection device and the object to be tested is between 50 and 150 meters. The defect detection method according to claim 1, wherein the liquid is a volatile liquid. A defect detection device is used to detect an item to be tested, and the defect detection device includes: a flight body; a photographing lens group installed on the flight body; a spraying component, including: a liquid storage container installed on the an aircraft body for storing a liquid; a spray head connected to the liquid storage container; and a fluid driver installed in the liquid storage container and used to make the liquid stored in the liquid storage container spray out from the spray head; An early warning receiver is installed on the body and is used to receive at least one wind shear warning signal; and a processor adjusts the position of the flying body according to the at least one wind shear early warning signal; The object to be tested, and obtain at least one first thermal imaging image, the spray head is used to spray a liquid on the object to be tested, and photograph the object to be tested after spraying the liquid, so as to obtain at least one second thermal imaging image A frame, the processor is used to use the comparison result of the at least one first thermal imaging frame and the at least one second thermal imaging frame as a basis for defect detection. The defect detection device as claimed in claim 11, wherein the sprinkler assembly further includes at least one shutter, and the at least one shutter is shielded from one side of the spray head. The defect detection device as described in claim 11 further includes a stand, the stand includes a first extension part, a second extension part and a third extension part, the first extension part and the second extension part They are respectively connected to opposite sides of the third extension part and form a triangular structure together. The first extension part and the second extension part are assembled on the aircraft body. The defect detection device according to claim 11, wherein the aircraft body includes a fuselage, a plurality of spiral blades and at least one guard, the spiral blades are arranged on the fuselage, and the at least one guard is arranged on the fuselage , and protected on one side of one of the helical blades. The defect detection device according to claim 11 further includes a parachute installed on the flying body. The defect detection device as described in claim 11, wherein the camera lens group includes a visible light lens and a thermal image lens, and when the defect detection device performs a remote detection, through the visible The optical lens detects the object to be tested, and when the defect detection device performs a close-up detection, it detects the object to be tested through the thermal image lens.

Images