CN206292170U - Article based on Raman spectrum checks equipment - Google Patents

Abstract

The present application discloses an item inspection device based on Raman spectroscopy. The article inspection equipment includes: a laser, used to emit laser light; an optical guiding device, used to guide the laser light to the measured object and collect Raman scattered light from the measured object; a spectrum generating device, used to receive The Raman scattered light collected by the guide device generates a Raman spectrum signal; the spectrum analysis device is used to analyze the Raman spectrum signal to obtain an inspection result; The state of the object under test is used to control the item inspection operation. The above-mentioned item inspection equipment based on Raman spectroscopy can improve the reliability and accuracy of the item inspection operation by monitoring the detection process.

Description

Item inspection equipment based on Raman spectroscopy

technical field

The utility model relates to a Raman spectrum detection technology, in particular to an article inspection device based on the Raman spectrum.

Background technique

In recent years, Raman spectroscopy has been widely used in the fields of dangerous goods inspection and substance identification. Among them, in the field of dangerous goods inspection, various dangerous chemicals have become one of the main means of committing crimes due to the increasingly diversified means of terrorists targeting violent terrorist activities in public places. In response to this situation, the security inspection agency has added inspection requirements for hazardous chemicals on the basis of the previous security inspection of luggage and packages; in addition, in the field of substance identification, due to the different colors and shapes of various substances, people usually It is impossible to accurately judge the properties of the substance, and the Raman spectrum is determined by the molecular energy level structure of the detected object, so the Raman spectrum can be used as the "fingerprint" information of the substance for substance identification. Therefore, Raman spectroscopy analysis technology is widely used in customs, public security, food and drug, environment and other fields.

In the application field of Raman spectroscopic analysis technology, due to the wide variety of detected objects, the physical properties of various substances will be different, and their thermal sensitivity to laser irradiation used for Raman spectroscopic analysis technology will be different. However, the existing Raman spectroscopy detection instrument does not provide the function of monitoring the detection process of Raman spectroscopy.

Utility model content

The purpose of the present utility model is to provide an item inspection device based on Raman spectroscopy, which can monitor the detection process, especially monitor the state of the object to improve the reliability of the item inspection device.

The embodiment of the utility model provides a kind of item inspection equipment based on Raman spectrum, comprising:

a laser for emitting laser light;

an optical guiding device, used to guide the laser light to the measured object and collect Raman scattered light from the measured object;

a spectrum generating device, configured to receive the Raman scattered light collected by the optical guiding device and generate a Raman spectrum signal;

A spectral analysis device, configured to analyze the Raman spectral signal to obtain an inspection result; and

The monitoring device is used for monitoring the state of the object under test and controlling the inspection operation of the object according to the state of the object under test.

In one embodiment, the monitoring device includes:

an information acquisition unit configured to acquire state information of the measured object;

A control unit configured to start or stop an item inspection operation based on the state information of the object under test.

In an embodiment, the information acquisition unit includes a photographing unit configured to photograph a part of the object to be measured to acquire color information of the part to be measured as state information of the object to be measured.

In one embodiment, the control unit is configured to stop the item inspection operation when the color of the part to be tested is a predetermined color.

In an embodiment, the information acquisition unit includes a temperature measurement unit configured to measure the temperature of the object under test during an item inspection operation.

In one embodiment, the control unit is configured to stop the item inspection operation when the magnitude or the slope of change of the temperature of the object exceeds a predetermined threshold.

In one embodiment, the temperature measurement unit includes an infrared temperature measurement device.

In an embodiment, the information acquisition unit further includes a laser irradiation hazard identification unit configured to identify whether a non-irradiation object falls into an area irradiated or to be irradiated by the laser.

In an embodiment, the non-irradiated object includes a human face.

In an embodiment, the monitoring device further includes a recording unit configured to record the physical image of the measured object.

In one embodiment, the item inspection operation includes lasing with a laser.

In an embodiment, the Raman spectroscopy-based item inspection device further includes a weight identification device for identifying the item according to the weight of the object to be tested.

In one embodiment, the weight identification device includes:

The weighing unit is used to measure the weight of the measured object;

a storage unit for storing a database of predetermined reference weights and barcodes corresponding thereto;

a comparison unit, configured to compare the measured weight of the measured object with the reference weight to determine the barcode corresponding to the reference weight closest to the measured weight of the measured object; and

The output unit outputs the determined barcode as a weight recognition result.

The aforementioned at least one embodiment of the utility model can improve the reliability and accuracy of the Raman spectrum-based item inspection equipment and method by monitoring the detection process.

Description of drawings

FIG. 1 shows a schematic structural view of an item inspection device based on Raman spectroscopy according to an embodiment of the present invention;

Fig. 2 shows a schematic diagram of modules of a spectral analysis device in a Raman spectrum-based item inspection device according to an embodiment of the present invention;

Fig. 3 shows the module schematic diagram of the weight identification device in the article inspection equipment based on Raman spectrum according to the embodiment of the present utility model; And

Fig. 4 shows the flowchart of the article inspection method based on Raman spectrum according to an embodiment of the present invention;

FIG. 5 shows a schematic diagram of an item inspection device based on Raman spectroscopy according to an embodiment of the present invention;

FIG. 6 shows a schematic diagram of an item inspection device based on Raman spectroscopy according to another embodiment of the present invention;

Fig. 7 shows a schematic diagram of an item inspection device based on Raman spectroscopy according to yet another embodiment of the present invention;

Fig. 8 shows a schematic diagram of an item inspection device based on Raman spectroscopy according to yet another embodiment of the present invention;

Fig. 9 shows a schematic diagram of an item inspection device based on Raman spectroscopy according to another embodiment of the present invention;

FIG. 10 shows a flow chart of a monitoring method for an item inspection device based on Raman spectroscopy according to an embodiment of the present invention; and

Fig. 11 shows a schematic diagram of an item inspection device based on Raman spectroscopy according to another embodiment of the present invention.

detailed description

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following descriptions of the embodiments of the utility model with reference to the accompanying drawings are intended to explain the overall utility model concept of the utility model, and should not be construed as a limitation of the utility model.

Fig. 1 schematically shows a Raman spectroscopy-based item inspection device 100 according to an embodiment of the present invention. The item inspection device 100 includes: a laser 10 for emitting laser light; an optical guiding device 20 for guiding the laser light onto the object 60 to be measured and collecting Raman scattered light from the object 60 to be measured; a spectrum generating device 30 , for receiving the Raman scattered light collected by the optical guiding device 20 and generating a Raman spectrum signal; the spectrum analysis device 40 is used for analyzing the Raman spectrum signal to obtain an inspection result; and the monitoring device 50 is used for It monitors the state of the object under test 60 and controls the inspection operation of the object according to the state of the object under test 60 .

Due to the wide range of applications of Raman spectroscopy, the detection objects vary widely and may have different physical properties, and their thermal sensitivity to the laser irradiation used for Raman spectroscopy will vary. Some substances have the possibility of being ignited, burned or even exploded during laser irradiation. Before the detection, the characteristics of the object to be tested are often not clearly determined. Therefore, for safety considerations, the object inspection device 100 in the embodiment of the present invention is provided with a monitoring device 50 . The monitoring device 50 can monitor the state of the measured object 60 . When it is found that the state of the detected object 60 is abnormal, the monitoring device 50 can stop the operation of the object inspection device 100 in time to prevent danger or obtain incorrect detection results.

In an example, the monitoring device 50 may include: a control unit 51 and an information acquisition unit 52 . The information acquiring unit 52 is configured to acquire state information of the object under test 60 , and the control unit 51 is configured to start or stop the item inspection operation based on the state information of the object under test 60 . As an example, the state information of the measured object 60 may be the color information of the portion to be measured of the measured object, and correspondingly, the information acquisition unit 52 may include a photographing unit 53, which may be configured to monitor the measured object 60 The part to be tested is photographed to obtain the color information of the part to be tested. As an example, when the color of the part to be tested is black, it often means that the part to be tested has been burnt. Therefore, when the color of the part to be tested is captured by the photographing unit 53 as black, the control unit 51 can be configured to stop Item inspection operations, such as stopping lasers from emitting lasers, etc. As an example, the photographing unit 53 may include photographing tools known in the art such as a camera or a camera. The photographing unit 53 can acquire an overall or partial image of the object under test, and acquire state information such as the color and shape of the object under test. It should be understood that although the above is described with black as an example, the embodiment of the present invention is not limited thereto. For example, the control unit 51 may also be configured such that the color of the part to be tested captured by the photographing unit 53 is other predetermined colors or a combination of multiple colors stops the item inspection operation.

In an example, the information acquisition unit 52 includes a temperature measurement unit 54 configured to measure the temperature of the object under test 60 during an item inspection operation. The temperature of the measured object 60 under laser irradiation can be measured by the temperature measuring unit 54 , and then it can be monitored whether the temperature amplitude or rising speed (change slope) exceeds a predetermined threshold. The threshold can be determined according to the specific material of the measured object and the allowable working temperature of the optical guiding device. For example, the threshold of the temperature amplitude can be 80 degrees or 100 degrees, and the threshold of the temperature change slope can be 10 degrees/second, etc. As an example, when the temperature amplitude or change slope exceeds a predetermined threshold, it often means that the measured object is in danger of being ignited, burnt or exploded. Therefore, as an example, the control unit 51 may be configured to stop the item inspection operation when the amplitude or change slope of the temperature of the object under test 60 exceeds a predetermined threshold, such as stopping the laser from emitting laser light. As an example, the temperature measuring unit 54 may include one or more infrared temperature measuring devices, and may also include other temperature measuring devices known in the art. As an example, the temperature measurement unit 54 may measure the temperature in a non-contact manner, or may measure the temperature in a contact manner.

In an example, the information acquisition unit 52 may further include a laser irradiation hazard identification unit 55 . The laser irradiation hazard identification unit 55 may be configured to identify whether a non-irradiation object falls into an area irradiated or to be irradiated by laser light. For example, the laser irradiation risk identification unit 55 may be an imaging device capable of identifying non-irradiated objects. As an example, the non-irradiated objects include human faces and even human eyes. In an example, the laser irradiation risk identification unit 55 can monitor whether the human face or human eyes fall into the area that may be irradiated by laser light, and once it is found that the human face or human eyes fall into the area that may be irradiated by laser light, The control unit 51 will immediately stop the item inspection operation, such as stopping the laser from emitting laser light, etc., to avoid danger.

In the above embodiments, the information acquisition unit 52 may include any one of the photographing unit 53 , the temperature measurement unit 54 , and the laser irradiation hazard identification unit 55 , or any combination thereof. As an example, the information acquiring unit 52 may include one or more camera devices. As an example, the imaging unit 53 and the laser irradiation risk identification unit 55 may also be realized by the same imaging device. Any one or both of the photographing unit 53 , the temperature measurement unit 54 and the laser irradiation hazard identification unit 55 may be integrated with the spectrum analysis device 40 . As an example, one or more lasers 10, one or more spectrum generating devices 30 (such as spectrometers), one or more optical path guiding devices 20 may be provided in the article inspection device 100 according to the embodiment of the present invention. .

In an example, the monitoring device 50 may further include a recording unit 56 configured to record an actual image of the object under test 60 . With the help of the recording unit 56, the material information detected by the Raman spectroscopic analysis technology and the physical image such as the appearance and shape of the measured object can be recorded at the same time, which is convenient for evidence collection, information recording and transmission in practical applications.

As an example, the optical guide 20 may comprise a combination of discrete optical elements, or may be formed from a fiber optic probe. The spectrum generation device 30 can be realized by a spectrometer, for example, and the spectrum analysis device 40 can be realized by a data processing device (such as a computer, a microprocessor, etc.), for example, or a spectrometer with data processing functions. In an example, the spectrum analysis device 40 may include a storage unit for storing a reference Raman spectrum library, for comparing the detected Raman spectrum signal with the reference Raman spectrum signal in the reference Raman spectrum library to determine A comparison unit for the material composition of the item and an output unit for outputting a comparison result of the comparison unit. As an example, a barcode corresponding to each reference Raman spectrum signal in the reference Raman spectrum library can also be stored in the storage unit in the spectrum analysis device 40, and the comparison unit can determine the detected Raman spectrum signal during the comparison process. The barcode information corresponding to the reference Raman spectrum signal matched with the Raman spectrum signal, and the output unit can also output the barcode as one of the results.

As an example, considering the physical structure, as shown in Figure 2, the spectral analysis device 40 may include: an acquisition data memory 41, a read-only memory (ROM) 42, a random access memory (RAM) 43, an internal bus 44, an input device 45 , a processor 46 and a display device 47 . Acquisition data memory 41 is used for storing the Raman spectral signal data collected from spectrum generating device 30 (such as a spectrometer), and read-only memory 42 is used for storing configuration information and programs of spectral analysis device 40 (such as a data processing device), random access The memory 43 is used to temporarily store various data during the working process of the processor 46, the input device 45 (such as buttons, sensors, keyboards and mice, etc.) Means 47 are used to output the calculation results. In addition, computer programs for data processing may also be stored in the collected data memory 41 . The internal bus 44 connects the acquisition data memory 41 , the read only memory 42 , the random access memory 43 , the input device 45 , the processor 46 and the display device 47 .

After the operation command input by the user through the input device 45, the instruction code in the computer program instructs the processor to execute a predetermined data processing algorithm, and after obtaining the data processing result, it is displayed on a display device 47 such as an LCD display, or Output processing results directly in hard copy.

In an embodiment, the Raman spectroscopy-based item inspection device 100 may further include a weight identification device 70 for identifying the item according to the weight of the object 60 to be tested. As an example, as shown in FIG. 3 , the weight recognition device 70 may include: a weighing unit 71 for measuring the weight of the object 60 to be tested; a storage unit 72 for storing a predetermined reference weight and a corresponding barcode database; comparison unit 73, for comparing the weight of the measured object 60 with the reference weight to determine the barcode corresponding to the closest reference weight to the measured weight of the measured object and an output unit 74 for outputting the determined barcode as a weight identification result.

With the help of the weight identification device 70, the operator can comprehensively determine the material composition of the item through Raman spectral analysis and gravimetric analysis, thereby improving the reliability and accuracy of the item inspection result.

As an example, the weight identification device 70 and the spectral analysis device 40 may be implemented by the same data processing device (such as a computer, a microprocessor, etc.), or may be respectively implemented by different data processing devices.

As an example, the control unit 51 in the monitoring device 50 can also be realized by the same data processing device (such as computer, microprocessor, embedded system, etc.) The device 70 and the spectral analysis device 40 are implemented as independent data processing devices.

Embodiments of the present utility model also provide a method for inspecting items based on Raman spectroscopy, including:

Monitor the state of the measured object to determine whether the state of the measured object is normal;

If the state of the measured object is normal, start the laser to emit laser light to the measured object and collect the Raman scattered light from the measured object to detect the Raman spectrum of the measured object. If the state of the measured object is abnormal, stop The laser emits laser light to interrupt detection.

In an example, the state of the tested object includes the color of the tested object, and the abnormal state of the tested object includes that the color of the tested object is a predetermined color (such as black or other colors or a combination of multiple colors) , the state of the measured object is normal includes that the color of the measured object is a color other than the predetermined color (for example, not black).

In an example, the article inspection method based on Raman spectroscopy may further include: if the state of the measured object is normal, start real-time monitoring of the temperature of the measured object during the detection process, and once the temperature of the measured object is found If the predetermined threshold is exceeded, the laser is stopped to emit laser light and the detection is interrupted.

In an example, the Raman spectrum-based item inspection method may further include: comparing the detected Raman spectrum with a reference Raman spectrum and outputting a comparison result.

As an example, the article inspection method based on Raman spectroscopy may further include: taking an image of the whole or part of the object under test to form an image of the object and recording the image of the object. This can simultaneously record the material information detected by Raman spectroscopy and the physical images such as the appearance and shape of the measured object, which is convenient for evidence collection, information recording and transmission in practical applications.

The article inspection device and method based on Raman spectroscopy according to the embodiments of the present invention can effectively identify substances and monitor the operation process to improve the safety of inspection, and is especially suitable for inspection of dangerous articles.

FIG. 5 shows a schematic structural diagram of a Raman spectroscopy-based item inspection device 300 according to an embodiment of the present invention. The article inspection device 300 based on Raman spectroscopy includes: a laser 310 for emitting excitation light 311; an optical device 320 for guiding the excitation light 311 to the sample 330 to be tested and collecting The spectrometer 340 is used to split the received light signal to generate the Raman spectrum of the sample to be tested 330 ; and the safety detector 350 is used to detect the infrared light 331 emitted by the sample to be tested 330 . As an example, the Raman spectrum of the sample to be tested 330 generated by the spectrometer 340 can be compared with the Raman spectrum of a known substance to determine the composition of the sample to be tested 330 . This comparison can be done, for example, by a computer or processor.

In the Raman detection process, safety problems are often caused by the temperature rise caused by the heat absorption of the sample, which may lead to ablation of the measured object, and even ignition and detonation. However, in the embodiment of the present utility model, a safety detector (such as an infrared detector) 350 is used to detect the infrared light 331 emitted by the sample 330 to be tested, so as to monitor the temperature of the sample 30 to be tested. This is because when the temperature of the sample rises, the radiation energy of the infrared light is often accompanied by an increase. By monitoring the radiation energy of the infrared light, the temperature change of the sample 330 to be tested can be found, thereby avoiding safety accidents.

In an example, as shown in FIG. 6 , the optical device 320 may include a Raman optical signal collection optical path 321 for collecting Raman optical signals from the sample 330 to be tested. A first spectroscope 322 is arranged in the Raman optical path signal collection optical path 321, and the first spectroscopic mirror 322 is arranged to form an infrared radiation branch 323 from the Raman optical path signal collection optical path 321, so as to transmit radiation from the sample to be tested. Infrared light in the light of 330 is directed towards security detector 350 . The first spectroscope 322 can extract the infrared light emitted by the sample 330 to be tested from the Raman optical path signal collection optical path 321 , and can detect the infrared light without affecting the Raman optical signal as much as possible. As an example, the first spectroscope 322 is required to reflect the infrared light in the response band of the safety detector to the safety detector as much as possible under the premise of not affecting the Raman light (generally in the range of 0-3000 cm ⁻¹ ). Of course, the infrared light in the infrared radiation branch 323 may also be subjected to band selection, convergence and other processing as required.

In the above example, the optical path passed by the infrared light and the optical path passed by the Raman light are the same at the front end (the end near the sample 330 to be tested), and the infrared light collected in this way can better reflect the sample to be tested. 30 actual temperature.

As an example, the first beam splitter 322 is a short-pass dichroic mirror configured to reflect light with a wavelength greater than a predetermined wavelength toward the security detector 350 and transmit light with a wavelength smaller than the predetermined wavelength. through the short-pass dichroic mirror. For example, the predetermined wavelength may be between 700 nanometers and 300 micrometers, such as between 900 nanometers and 1500 nanometers, for example, the predetermined wavelength may be set to 1200 nanometers. However, the predetermined wavelength of the short-pass dichroic mirror in the embodiment of the present invention is not limited to this range. Generally, the wavelength range of the Raman spectrum processed by the spectrometer in the Raman spectrum-based item inspection equipment is 550 to 900 nanometers. Light with a wavelength shorter than the predetermined wavelength can be transmitted through the short-pass dichroic mirror (for example, the transmittance can be above 90%), which has basically no effect on Raman spectrum detection, and light with a wavelength longer than the predetermined wavelength can be detected The reflections into the infrared radiation branch are transmitted to the security detector 350 . The corresponding infrared light will be received and analyzed by the safety detector. A typical safety detector response waveband is, for example, 1500 to 3000 nanometers. But the embodiments of the present invention are not limited thereto.

Although in the above examples, the first beam splitter 322 is introduced as a short-pass dichroic mirror, this is not necessary, and any other wavelength selective beam splitting components known in the art can also be used to implement the first beam splitter 322 .

In an example, as shown in FIG. 6 in an exemplary Raman spectrum-based article inspection device 300b, a first converging lens 324, a second converging lens 341 and a second beam splitter 325. The first converging lens 324 is used for converging the excitation light 311 to the sample 330 to be tested and collecting the light signal from the sample 330 to be tested. The second converging lens 341 is used for converging the collected optical signal to the spectrometer. The second beam splitter 325 is located between the first converging lens 324 and the first beam splitter 322 in the Raman optical signal collection optical path 321, and is arranged to converge the excitation light 311 from the laser 310 to the first beam splitter. The lens 324 reflects and transmits at least a part of the reflected light collected by the first converging lens 324 from the sample 330 to be transmitted to the first dichroic mirror 322 or the second converging lens 341 . In this example, the optical path where the excitation light 311 is guided to the sample to be tested 330 overlaps with the Raman optical signal collection optical path 321 between the second spectroscope 325 and the sample to be tested 330 . In the optical path, the first beam splitter 322 is located downstream of the second beam splitter 325, which can avoid interference with the front end of the optical path.

As an example, the positions of the first beam splitter 322 and the second beam splitter 325 in FIG. 6 can be interchanged. For example, as shown in FIG. 11 , in the Raman spectrum detection device 300b', the second beamsplitter 325 is located between the first beamsplitter 322 and the second converging lens 341 in the Raman optical signal collection optical path 321.

As an example, the second beam splitter 325 may be a long-pass dichroic mirror, which only allows light with a wavelength longer than a certain threshold to pass through, and blocks light with a wavelength shorter than the threshold. The advantage of this scheme is that the Rayleigh light from the sample 330 to be tested can be weakened. When the sample 330 to be tested produces Raman light, it also often produces Rayleigh light with a wavelength smaller than Raman light, and the threshold of the long-pass dichroic mirror can be set to weaken or even eliminate Rayleigh light with a shorter wavelength, thereby improving the Raman light. The signal-to-noise ratio of the Mann optical signal. The specific threshold of the long-pass dichroic mirror can be selected according to the actual measurement requirements. In the embodiment of the present invention, the second beam splitter 325 is not limited to a long-pass dichroic mirror, for example, any other beam splitting components known in the art may also be used to realize the second beam splitter 325 .

In an example, in order to better suppress Rayleigh light, a long-pass filter or notch filter 326 can also be set downstream of the first beam splitter in the Raman optical signal collection optical path 321 to filter out the Rayleigh light in the optical signal behind the mirror. Certainly, the embodiment of the present invention is not limited thereto, for example, the long-pass filter or the notch filter 326 may not be provided.

In another example, as shown in FIG. 7 and FIG. 8 , the optical device 320' may further include: a Raman optical signal collection optical path 321 for collecting the Raman optical signal from the sample to be measured; and an infrared light collection The optical path 323 ′ is used to collect infrared light from the sample 330 to be tested. Different from the infrared radiation branch 323 in the example shown in Fig. 5 and Fig. 6 above, the infrared light collection optical path 323' is completely independent from the Raman optical signal collection optical path 321. This can preserve the original optical path structure of the Raman spectroscopy detection device as much as possible. The safety detector 350 can be set at any position near the sample 330 to be tested, as long as the intensity of the infrared signal can meet the detection requirements of the safety detector 350 .

The difference between the exemplary Raman spectroscopy-based article inspection device 300c shown in FIG. 7 and the exemplary Raman spectroscopy-based article inspection device 300d shown in FIG. Be guided to the optical path on the sample 330 to be tested and the Raman light signal collection optical path 321 is overlapped from the part between the second beam splitter 325 and the sample 330 to be measured, and in FIG. 8 , the excitation light 311 is guided to The optical path on the sample to be tested 330 is completely independent from the Raman optical signal collection optical path 321 (or called the excitation light 311 is irradiated off-axis to the sample to be tested 330 ).

In the examples of Fig. 5 and Fig. 8, as an example, before the excitation light is irradiated on the sample 330 to be tested, the direction can be changed by some optical elements (such as mirrors, etc.) so as to be more conveniently and accurately guided to On the sample 330 to be tested.

As shown in FIG. 9 , in an example, the Raman spectroscopy-based item inspection device 300 e may further include a controller 360 . The controller 360 receives the detection result of the safety detector 350 and sends a control signal to the laser 310 . The controller 360 may be configured to reduce the power of the laser 310 or turn off the laser 310 when the radiation energy of the infrared light detected by the security detector 350 exceeds a predetermined threshold. As an example, since there is a corresponding relationship between the temperature of the sample 330 to be tested and the radiant energy of the infrared light it emits, the predetermined threshold value of the radiant energy of the infrared light set in the controller 360 may correspond to a threshold not exceeding the radiant energy of the sample to be tested. The temperature value of the maximum allowable temperature of 330, so as to prevent the sample 330 to be tested from being destroyed due to excessive temperature. The controller 360 may be implemented by components such as integrated circuits, signal processors, computers, and the like.

As an example, the optical device 320 can be integrated in the fiber probe 370, the excitation light 311 emitted by the laser 310 can be introduced into the fiber probe 370 through the introduction fiber 371, and the fiber probe 370 collects the collected light through the collection fiber 372. The Raman optical signal is transmitted to the spectrometer 340 . Of course, the optical device 320 can also be constructed by discrete optical elements. However, the use of the optical fiber probe 370 can improve the stability of the system.

As an example, the excitation light may also pass through a collimator lens 327 and a narrow-band filter 328 before reaching the second beam splitter 325 or the first converging lens 324 . The collimator lens 327 can make the excitation light nearly parallel to improve directivity and optical efficiency. The narrowband filter 328 can remove interference and improve the signal-to-noise ratio of the excitation light in the desired wavelength band. As an example, in order to realize the folding of the optical path, one or more deflection mirrors 329 may also be provided. As an example, in order to better couple the Raman signal light into the spectrometer 340 , a second converging lens 341 may also be provided upstream of the collecting optical fiber 372 .

The embodiment of the present utility model also provides a safety monitoring method 200 for an item inspection device based on Raman spectroscopy. As shown in Figure 10, the security monitoring method 200 may include:

Step S10: emitting excitation light from a laser;

Step S20: guiding the excitation light to the sample to be tested and collecting Raman optical signals from the sample to be tested; and

Step S30: Detecting the radiation energy of the infrared light emitted by the sample to be tested by the safety detector to monitor the temperature of the sample to be tested.

The method can be used to monitor the temperature of the sample to be tested when the Raman spectroscopy-based item inspection equipment is working.

As an example, the security monitoring method 200 may also include:

Step S40: reducing the power of the laser or turning off the laser when the temperature of the sample to be measured is greater than a predetermined threshold.

This step S40 can monitor in real time whether the temperature of the sample to be tested is greater than a predetermined threshold (the predetermined threshold can be, for example, 80 degrees, 100 degrees, 150 degrees, etc. Sample 330 to determine), so as to ensure the safety of the detection work.

As an example, the monitoring method 200 may also include:

Step S50: Turn off the laser after the laser emits excitation light for a predetermined period of time, and determine the safety of the sample to be tested according to the temperature change of the sample to be tested during the predetermined period of time.

This step S50 can be used to evaluate the safety of the detection before formally performing the Raman spectrum detection operation. The predetermined period of time may be, for example, 0.5 seconds, 1 second, 3 seconds and so on. If it is expected that the temperature of the sample to be tested may be too high, Raman detection parameters (such as laser power, position of the sample to be tested, etc.) can be controlled in a targeted manner, so as to avoid safety risks in the formal detection.

In the embodiment of the present utility model, step S40 and step S50 can be used alternatively, or can be used in combination. The dotted line part in Fig. 10 indicates optional steps.

The above detailed description has set forth numerous embodiments of the aforementioned Raman spectroscopy-based item inspection device and monitoring method thereof by using schematic diagrams, flow charts and/or examples. Where such schematic diagrams, flowcharts, and/or examples include one or more functions and/or operations, those skilled in the art will understand that each function and/or operation in such schematic diagrams, flowcharts, or examples may Individually and/or collectively implemented by various structures, hardware, software, firmware, or essentially any combination thereof. In one embodiment, several parts of the subject matter described in the embodiments of the present invention may be implemented by Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), or other integrated formats . However, those skilled in the art will recognize that some aspects of the embodiments disclosed herein may be equivalently implemented in whole or in part in an integrated circuit, implemented as one or more Computer programs (e.g., implemented as one or more programs running on one or more computer systems), implemented as one or more programs running on one or more processors (e.g., implemented as One or more programs running on multiple microprocessors), implemented as firmware, or substantially implemented as any combination of the above methods, and those skilled in the art will have the ability to design circuits and/or write software and and/or firmware code capabilities. Furthermore, those skilled in the art will recognize that the mechanisms of the presently disclosed subject matter can be distributed as a variety of forms of program products and that regardless of the particular type of signal-bearing media actually used to carry out the distribution, the subject matter of the presently disclosed Exemplary embodiments are applicable. Examples of signal bearing media include, but are not limited to: recordable-type media, such as floppy disks, hard drives, compact discs (CD, DVD), digital tape, computer memory, etc.; and transmission-type media, such as digital and/or analog communication media (e.g. , fiber optic cable, waveguide, wired communication link, wireless communication link, etc.).

Unless there are technical obstacles or contradictions, the above-mentioned various implementation modes of the present utility model can be freely combined to form other embodiments, and these other embodiments are all within the protection scope of the present utility model.

Although the utility model has been described in conjunction with the drawings, the embodiments disclosed in the drawings are intended to illustrate the preferred implementation of the utility model, and should not be construed as a limitation of the utility model. The size ratios in the drawings are only schematic and should not be construed as limitations on the present invention.

Although the utility model has been described in conjunction with the drawings, the embodiments disclosed in the drawings are intended to illustrate the preferred implementation of the utility model, and should not be construed as a limitation of the utility model.

Although some embodiments of the present general inventive concept have been shown and described, those skilled in the art will appreciate that changes can be made to these embodiments without departing from the principles and spirit of the present general inventive concept. The scope of the utility model is defined by the claims and their equivalents.

Claims (13)

1. a kind of article based on Raman spectrum checks equipment, it is characterised in that including：

Laser, for launching laser；

Optical directory means, for by the laser aiming to measured object and collect the Raman diffused light from measured object；

Spectrum generating means, for receive by optical directory means collect Raman diffused light and generate raman spectral signal；

Spectral analysis device, for being analyzed to draw inspection result to the raman spectral signal；And

Supervising device, for monitoring the state of measured object and according to the state of measured object controlling article inspection operation.

2. the article based on Raman spectrum according to claim 1 checks equipment, it is characterised in that the supervising device bag Include：

Information acquisition unit, described information acquiring unit is configured to obtain the status information of measured object；

Control unit, described control unit is configured to the status information based on the measured object to start or stop article inspection behaviour Make.

3. the article based on Raman spectrum according to claim 2 checks equipment, it is characterised in that described information obtains single Unit includes shooting unit, and the shooting unit is configured to shoot the detected part of measured object obtain the detected part Colouring information as measured object status information.

4. the article based on Raman spectrum according to claim 3 checks equipment, it is characterised in that described control unit is matched somebody with somebody It is set to and stops article inspection operation when the color of the detected part is predetermined color.

5. the article based on Raman spectrum according to claim 2 checks equipment, it is characterised in that described information obtains single Unit includes temperature measurement unit, and the temperature measurement unit is configured to be measured in article inspection operation the temperature of the measured object Degree.

6. the article based on Raman spectrum according to claim 5 checks equipment, it is characterised in that described control unit is matched somebody with somebody It is set to and stops article inspection operation when the amplitude or change slope of the temperature of the measured object exceed predetermined threshold value.

7. the article based on Raman spectrum according to claim 5 checks equipment, it is characterised in that the temperature survey list Unit includes infrared temperature measurement apparatus.

8. the article based on Raman spectrum according to claim 2 checks equipment, it is characterised in that described information obtains single Unit also includes that laser irradiates dangerous discernment unit, and whether the laser irradiation dangerous discernment unit is configured to identification non-irradiated object Fall into by laser or the region that will be irradiated with a laser.

9. the article based on Raman spectrum according to claim 8 checks equipment, it is characterised in that the non-irradiated object Face including people.

10. the article based on Raman spectrum according to claim 2 checks equipment, it is characterised in that the supervising device Also include recording unit, the recording unit is configured to record the material picture of the measured object.

11. article based on Raman spectrum according to any one of claim 1-10 checks equipment, it is characterised in that institute Stating article inspection operation includes sending laser with laser.

12. article based on Raman spectrum according to any one of claim 1-10 checks equipment, it is characterised in that also Including weight identifying device, article is distinguished for the weight according to measured object.

13. articles based on Raman spectrum according to claim 12 check equipment, it is characterised in that the weight identification Device includes：

Weighing unit, measures for the weight to measured object；

Memory cell, the database for storing predetermined referential weight and corresponding bar code；

Comparing unit, for the weight of measured measured object is compared with the referential weight with determine with it is measured Bar code corresponding to the immediate referential weight of weight of the measured object for arriving；And

Output unit, exports identified bar code as weight recognition result.