CN112285795A - Non-contact laser explosive rapid detection system and method - Google Patents
Non-contact laser explosive rapid detection system and method Download PDFInfo
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- CN112285795A CN112285795A CN202011069682.3A CN202011069682A CN112285795A CN 112285795 A CN112285795 A CN 112285795A CN 202011069682 A CN202011069682 A CN 202011069682A CN 112285795 A CN112285795 A CN 112285795A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Abstract
The invention provides a non-contact laser explosive rapid detection system, which comprises: the laser module is used for generating laser with preset power and preset wavelength; the auxiliary optical module is used for controlling the irradiation angle and the area of the laser generated by the laser module and expanding the laser into a surface light source; the thermal imaging module is used for collecting a thermal imaging signal of a target object in an irradiation area of the surface light source; the explosive identification module is used for acquiring a thermal imaging signal acquired by the thermal imaging module, judging whether a target object is an explosive or not according to the thermal imaging signal, judging the type of the explosive to which the target object belongs if the target object is the explosive, and outputting a judgment result; and the alarm display module is used for acquiring the judgment result of the explosive identification module, displaying the judgment result and giving an alarm. The invention provides a method for realizing non-contact detection of explosives of different types by utilizing laser and infrared thermal imaging technologies; the dual-wavelength laser is utilized for irradiation, and the dual-waveband infrared thermal imaging is used for detection, so that the adaptability to different types of explosives is enhanced.
Description
Technical Field
The invention relates to the technical field of explosive detection, in particular to a non-contact laser explosive rapid detection system and a non-contact laser explosive rapid detection method.
Background
Traditional explosive detection is mostly carried out the manual work and detects to make relevant departments cost a large amount of manpower and materials, criminal suspects can also avoid inspection personnel's inspection, bring inconvenience for relevant departments work. Therefore, how to carry out unmanned automatic detection in outdoor public places and ensure the coverage area and the safety and stability of a detection area becomes a technical problem to be solved urgently.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a non-contact laser explosive rapid detection system and a non-contact laser explosive rapid detection method.
The invention provides a non-contact laser explosive rapid detection system, which comprises:
the laser module is used for generating laser with preset power and preset wavelength;
the auxiliary optical module is used for controlling the irradiation angle and the area of the laser generated by the laser module and expanding the laser into a surface light source;
the thermal imaging module is used for collecting a thermal imaging signal of a target object in an irradiation area of the surface light source;
the explosive identification module is used for acquiring a thermal imaging signal acquired by the thermal imaging module, judging whether a target object is an explosive or not according to the thermal imaging signal, judging the type of the explosive to which the target object belongs if the target object is the explosive, and outputting a judgment result;
and the alarm display module is used for acquiring the judgment result of the explosive identification module, displaying the judgment result and giving an alarm.
Preferably, the laser module is a dual-wavelength laser, and the laser wavelength is 8-14 μm.
Preferably, the auxiliary optical module comprises an optical path component and a beam expanding device; the light path component is used for controlling the angle and the area of laser irradiation; the beam expanding device is used for expanding the laser into a surface light source; preferably, the beam expanding means is a lens made of calcium fluoride material.
Preferably, the thermal imaging module comprises a first thermal imager with a working wave band of 8-14 μm and a second thermal imager with a working wave band of 3-5 μm, and the first thermal imager and the second thermal imager are respectively used for acquiring thermal imaging signals of the target object.
Preferably, the explosive identification module acquires thermal imaging signals acquired by the first thermal imager and the second thermal imager, compares the thermal imaging signals acquired by the first thermal imager and the second thermal imager with the characteristics in the explosive thermosensitive characteristic database respectively, and comprehensively analyzes and judges whether the target object is an explosive or not.
Preferably, the system further comprises a management control module, and the management control module is used for realizing real-time information interaction between the user instruction and the laser module and the thermal imaging module.
The invention also provides a non-contact laser explosive rapid detection method, which comprises the following steps:
s1, generating laser with preset power and preset wavelength;
s2, controlling the laser irradiation angle and area and expanding the laser into a surface light source;
s3, collecting thermal imaging signals of the target object in the irradiation area of the surface light source;
s4, judging whether the target object is an explosive or not according to the thermal imaging signal; if yes, judging the explosive type of the target object and outputting a judgment result, and executing the step S5; if not, go to step S3;
and S5, displaying the judgment result and giving an alarm.
Preferably, in step S1, the laser is a two-wavelength laser with a single-frequency output.
Preferably, in step S3, the first thermal imager with an operating wavelength band of 8-14 μm and the second thermal imager with an operating wavelength band of 3-5 μm are used to collect thermal imaging signals of the target object in the irradiation area of the surface light source, respectively.
Preferably, in step S4, the thermal imaging signals of the target object collected by the first thermal imager and the second thermal imager are respectively compared with the characteristics in the thermal characteristic database of the explosive, and the comprehensive analysis is performed to determine whether the target object is an explosive.
The non-contact laser explosive rapid detection system provided by the invention has the following advantages: (1) based on the vibration-rotation absorption characteristic of N-O molecular groups in explosives under the laser radiation condition, the laser and infrared thermal imaging technology is provided, the non-contact detection of different types of explosives is realized, the accuracy rate is high, the safety is good, and the blank of the domestic non-contact explosive trace detection field is filled; (2) the dual-wavelength laser is used for irradiation, and dual-waveband infrared thermal imaging is used for detection, so that the adaptability to different types of explosives is enhanced, the detection accuracy is improved, and the false alarm rate is reduced; (3) a data model is constructed according to a people flow intensive scene, an explosive feature processing and target recognition algorithm is provided, the problems of extraction and analysis processing of explosive thermosensitive features in an infrared image in a complex environment are effectively solved, the environmental adaptability of the detection device is effectively improved, and the detection accuracy is further improved.
Drawings
Fig. 1 is a frame diagram of a non-contact laser explosive rapid detection system according to the present invention;
FIG. 2 is a schematic diagram of a non-contact laser explosive rapid detection system according to the present invention;
fig. 3 is a flowchart of a non-contact laser explosive rapid detection method according to the present invention.
Detailed Description
Referring to fig. 1, the present invention provides a non-contact laser explosive rapid detection system, including: the system comprises a laser module, an auxiliary optical module, a thermal imaging module, an explosive identification module, an alarm display module and a management control module.
The laser module is a single-frequency output dual-wavelength laser, is used for generating laser with preset power and preset wavelength, and requires uniform light beams and high stability and reliability, and the wavelength of the laser can be selected to be 10.6 microns and 9.3 microns.
The auxiliary optical module mainly comprises an optical path component and a beam expanding device; the light path component is used for controlling the angle and the area of laser irradiation; the beam expanding device is used for expanding laser into a surface light source, and is a lens made of calcium fluoride material, and the material has high transmittance for a wave band of 8-14 mu m and small refractive index.
The thermal imaging module comprises a first thermal imager with a working wave band of 8-14 mu m and a second thermal imager with a working wave band of 3-5 mu m, wherein the 8-14 mu m wave band can cover the working wave band of the laser, the 3-5 mu m wave band can be used for observing laser reflection in an auxiliary manner, the first thermal imager and the second thermal imager are respectively used for collecting thermal imaging signals of a target object, and the characteristics and the differences of the target under different detection conditions are obtained by detecting the radiation temperature change in the process.
The explosive identification module acquires thermal imaging signals acquired by the first thermal imager and the second thermal imager, compares the thermal imaging signals acquired by the first thermal imager and the second thermal imager with the characteristics in the explosive thermosensitive characteristic database respectively, comprehensively analyzes and judges whether the target object is an explosive or not, judges the type of the explosive to which the target object belongs if the target object is the explosive, and outputs a judgment result.
And the alarm display module acquires the judgment result of the explosive identification module, displays the judgment result and gives an alarm at the same time.
And the management control module is used for realizing the real-time information interaction between the user instruction and the laser module and between the user instruction and the thermal imaging module. The user can set parameters such as the power and the wavelength of the laser, the laser irradiation angle, the area, the spot size and the intensity of the laser and the like through the management control module according to the needs.
In the molecular structure of common explosives and dangerous goods, N-O molecular groups are generally contained. Under the laser irradiation condition of a laser wave with a specific wavelength and power, the groups can cause the surface temperature of the explosive to rise rapidly due to the existence of vibration-rotation absorption bands. As the irradiation time continues to increase, the explosive particles absorb heat and release heat in equilibrium, the surface temperature is stable, and the maximum temperature is maintained at about 40-60 degrees. For non-explosive substances, N-O groups in molecules are few, and the temperature rise speed is slow under the condition of the same radiation dose, so that the temperature difference between the non-explosive substances and the explosive substances is generally 3-15 degrees.
Referring to fig. 2, when the invention works, the laser generates laser with certain power and wavelength, the incident angle and the irradiation area of the laser can be adjusted through the light path component, the point light source is processed by the beam expanding device, and then expanded into a surface light source which is uniformly irradiated on the surface of the detected target object; the thermal imaging module detects the surface temperature of a target object and collects a thermal imaging signal; the explosive identification module compares the thermal imaging signal with the characteristics in the explosive thermosensitive characteristic database, and judges the type of the explosive after comprehensive analysis; and the alarm display module displays the judgment result and gives an alarm.
Referring to fig. 3, the detection method of the non-contact laser explosive rapid detection system includes the following steps:
s1, generating single-frequency output dual-wavelength laser with preset power and preset wavelength;
s2, controlling the laser irradiation angle and area and expanding the laser into a surface light source;
s3, respectively collecting thermal imaging signals of the target object in the irradiation area of the surface light source by using a first thermal imager with a working waveband of 8-14 microns and a second thermal imager with a working waveband of 3-5 microns;
s4, comparing the thermal imaging signals of the target object collected by the first thermal imager and the second thermal imager with the characteristics in the explosive thermosensitive characteristic database respectively, and comprehensively analyzing and judging whether the target object is an explosive or not; if yes, judging the explosive type of the target object and outputting a judgment result, and executing the step S5; if not, go to step S3;
and S5, displaying the judgment result and giving an alarm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A non-contact laser explosive rapid detection system, comprising:
the laser module is used for generating laser with preset power and preset wavelength;
the auxiliary optical module is used for controlling the irradiation angle and the area of the laser generated by the laser module and expanding the laser into a surface light source;
the thermal imaging module is used for collecting a thermal imaging signal of a target object in an irradiation area of the surface light source;
the explosive identification module is used for acquiring a thermal imaging signal acquired by the thermal imaging module, judging whether a target object is an explosive or not according to the thermal imaging signal, judging the type of the explosive to which the target object belongs if the target object is the explosive, and outputting a judgment result;
and the alarm display module is used for acquiring the judgment result of the explosive identification module, displaying the judgment result and giving an alarm.
2. The system of claim 1, wherein the laser module is a dual-wavelength laser and the laser wavelength is 8-14 μm.
3. The system for rapidly detecting non-contact laser explosives in accordance with claim 1, wherein the auxiliary optical module comprises an optical path component and a beam expanding device; the light path component is used for controlling the angle and the area of laser irradiation; the beam expanding device is used for expanding the laser into a surface light source; preferably, the beam expanding means is a lens made of calcium fluoride material.
4. The non-contact laser explosive rapid detection system according to any one of claims 1 to 3, wherein the thermal imaging module comprises a first thermal imager with an operating wavelength band of 8 to 14 μm and a second thermal imager with an operating wavelength band of 3 to 5 μm, and the first thermal imager and the second thermal imager are respectively used for acquiring thermal imaging signals of the target object.
5. The non-contact laser explosive rapid detection system according to claim 4, wherein the explosive identification module acquires thermal imaging signals collected by the first thermal imager and the second thermal imager, compares the thermal imaging signals collected by the first thermal imager and the second thermal imager with the characteristics in the explosive thermosensitive characteristic database, and comprehensively analyzes and judges whether the target object is an explosive or not.
6. The system for rapidly detecting non-contact laser explosives according to any of claims 1-3, characterized by further comprising a management control module, wherein the management control module is used for realizing real-time information interaction between user instructions and the laser module and the thermal imaging module.
7. A non-contact laser explosive rapid detection method is characterized by comprising the following steps:
s1, generating laser with preset power and preset wavelength;
s2, controlling the laser irradiation angle and area and expanding the laser into a surface light source;
s3, collecting thermal imaging signals of the target object in the irradiation area of the surface light source;
s4, judging whether the target object is an explosive or not according to the thermal imaging signal; if yes, judging the explosive type of the target object and outputting a judgment result, and executing the step S5; if not, go to step S3;
and S5, displaying the judgment result and giving an alarm.
8. The method for rapidly detecting non-contact laser explosives in claim 7, wherein in step S1, the laser is a dual-wavelength laser with single-frequency output.
9. The method for rapidly detecting non-contact laser explosives in claim 7, wherein in step S3, the thermal imaging signals of the target object in the area light source irradiation area are respectively collected by using a first thermal imager with an operating band of 8-14 μm and a second thermal imager with an operating band of 3-5 μm.
10. The method for rapidly detecting non-contact laser explosives in claim 9, wherein in step S4, the thermal imaging signals of the target object collected by the first thermal imager and the second thermal imager are respectively compared with the characteristics in the thermal characteristic database of the explosives, and the comprehensive analysis is performed to determine whether the target object is an explosive or not.
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