CN204598152U - Based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter - Google Patents
Based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter Download PDFInfo
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- CN204598152U CN204598152U CN201520174723.3U CN201520174723U CN204598152U CN 204598152 U CN204598152 U CN 204598152U CN 201520174723 U CN201520174723 U CN 201520174723U CN 204598152 U CN204598152 U CN 204598152U
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Abstract
The utility model discloses the infrared imaging evidence-obtaining system based on acousto-optic tunable filter, comprise infrared lens, Infrared Acousto-optical Tunable Filter, indium gallium arsenic area array CCD infrared image sensor, acousto-optic tunable filter driver, image capture module and computer.After Infrared Acousto-optical Tunable Filter is positioned at infrared lens, after indium gallium arsenic area array CCD infrared image sensor is positioned at Infrared Acousto-optical Tunable Filter, the picture signal that image capture module exports for gathering indium gallium arsenic area array CCD infrared image sensor, and the picture signal of collection is sent to computer, the interface of computer is connected with the input of acousto-optic tunable filter driver, and the output of acousto-optic tunable filter driver is connected with the signal input part of Infrared Acousto-optical Tunable Filter.The utility model can carry out infrared imaging evidence obtaining at criminal case crime scene, have the precision of higher infrared imaging, and detectivity is strong.
Description
Technical field
The utility model relates to the technology of forensic science criminal case crime scene evidence obtaining, particularly relates to the infrared imaging evidence-obtaining system based on acousto-optic tunable filter.
Background technology
Infrared ray is the sightless heat ray of a kind of human eye, and it observes the laws such as the straightline propagation of light, reflection and refraction.A lot of materials in nature to ultrared absorption, reflect, ability and the visible ray such as to penetrate, ultraviolet is different, infrared penetration ability is stronger, material inside can be entered and arrive more deep layer position, even can penetrate some visible rays and the intransitable material of ultraviolet.Therefore, infrared imaging is carried out to object, the object information different from visible ray and ultraviolet imagery or details can be obtained.
In forensic science and material evidence qualification field, infrared photography technology is often adopted to manifest and extract potential material evidence.As: manifest all kinds of writing words and by the writing smeared; Carry out the discriminating of true and false coin; The writing burnt on paper is taken pictures reduction; Taken pictures in outdoor haze flue dust scene; Swoon vestige and dust footprint of rifle is manifested; Writing on dark cloth, seal, bloodstain etc. are taken pictures and manifests.The current restriction by camera devices, the infrared filter of scene evidence taking adopts long-pass optical filtering usually, because long-pass optical filtering wave-length coverage is wider, is unfavorable for the discriminating of material evidence.
In addition, in forensic science and material evidence qualification field, conventional infrared photography wave band is 700-1200nm.Because Infrared wavelength its penetration capacity longer is also stronger, therefore, be necessary that research and development wavelength is greater than the infrared imaging device of 1200nm, to improve the extractability of on-the-spot potential material evidence, for solving criminal cases provides technical support.
Imaging spectrometer is developed by the principle of the multiple remote sensing instrument such as infrared line scanner and multispectral scanner, can achieve scanning imagery and meticulous light splitting simultaneously.It is on the basis of scanning imagery principle, the wave band of image-forming radiation is divided into more narrow multiple wave bands and carries out imaging, same scenery is obtained to the image of more spectral band.Imaging spectrometer comprises image-generating unit and spectrum unit two parts, and image-generating unit is used for the aerial image to ground object target, and spectrophotometric unit is used for spectral band segmentation or the scanning of spectrum dimension.Spectrographic detection instrument can be divided into optical filtering flap-type, grating type, Fourier blade profile, diode array type, acousto-optic tunable filter (Acousto-Optic Tunable Filter is called for short AOTF) type etc. by the difference of spectroscopic modes.
Wherein, acousto-optic tunable filter (AOTF) is a kind of automatically controlled light filter, it is based on the principle of acoustooptical effect, when a branch of polychromatic light by a dither there is the crystal of Photoelasticity time, the monochromatic light of a certain wavelength will produce diffraction at crystals, transmit from crystal at a certain angle, the polychromatic light that diffraction do not occur then along former light transmition direction directly transmitted through crystal, reach the object of light splitting thus.Acousto-optic tunable filter is mainly divided into conllinear type acousto-optic tunable filter and non-co-line style acousto-optic tunable filter, because non-co-line style acousto-optic tunable filter has larger bore and the angle of visual field, diffraction light and non-diffraction light have certain separation angle simultaneously, spatially achieve separation, crystalline material is easy to obtain, diffraction can be carried out to natural daylight, become the type generally used at present.When crystal vibration frequency changes, diffraction light wavelength is corresponding change also, the general principle of acousto-optic tunable filter light splitting that Here it is.
Summary of the invention
The precision that technical problem to be solved in the utility model is to provide a kind of can carry out infrared imaging evidence obtaining at criminal case crime scene, have higher infrared imaging, the infrared imaging evidence-obtaining system that detectivity is strong.
Further technical problem to be solved in the utility model is to provide a kind of infrared imaging evidence-obtaining system with automatic focusing function.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
Based on an infrared imaging evidence-obtaining system for acousto-optic tunable filter, comprise infrared lens, Infrared Acousto-optical Tunable Filter, indium gallium arsenic area array CCD infrared image sensor, acousto-optic tunable filter driver, image capture module and computer; After Infrared Acousto-optical Tunable Filter is positioned at infrared lens, after indium gallium arsenic area array CCD infrared image sensor is positioned at Infrared Acousto-optical Tunable Filter, the picture signal that image capture module exports for gathering indium gallium arsenic area array CCD infrared image sensor, and the picture signal of collection is sent to computer, the interface of computer is connected with the input of acousto-optic tunable filter driver, and the output of acousto-optic tunable filter driver is connected with the signal input part of Infrared Acousto-optical Tunable Filter.
The above-mentioned infrared imaging evidence-obtaining system based on acousto-optic tunable filter, wherein, this infrared imaging evidence-obtaining system of this automatic focusing device also comprises an automatic focusing device, described automatic focusing device comprise stepping motor for focusing to described infrared lens, stepper motor driving circuit, for detecting position-detection sensor and the controller of the focusing position of described infrared lens; The signal input part of described controller is connected with the signal output part of described position-detection sensor, and the control output end of controller is connected with the input of described stepper motor driving circuit, and the output of stepper motor driving circuit is connected with stepping motor.
After adopting technique scheme, the utility model has the following advantages:
1, the utility model replaces traditional long-pass infrared ray optical filtering with Infrared Acousto-optical Tunable Filter, makes ultrared imaging band more accurate, thus enhances the distinguishing ability of infrared imaging to similar material evidence; In addition, the utility model have employed indium gallium arsenic area array CCD infrared image sensor and carries out imaging, the wave band that infrared imaging is collected evidence reaches 1000 nm-1700nm, has stronger penetration capacity, thus enhances the detectivity of infrared imaging to potential material evidence;
2, the utility model is also provided with automatic focusing device, its lens focusing position detection signal that can detect according to position-detection sensor, infrared lens is adjusted to the focusing position of setting, compared with the mode of manual focusing, alleviate the labour intensity of operating personnel.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the infrared imaging evidence-obtaining system based on acousto-optic tunable filter according to the utility model one embodiment.
Fig. 2 shows the theory diagram of the automatic focusing device according to the utility model one embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model made and further illustrating.
Please refer to Fig. 1.According to the infrared imaging evidence-obtaining system based on acousto-optic tunable filter of the utility model one embodiment, comprise infrared lens 1, Infrared Acousto-optical Tunable Filter 2, indium gallium arsenic area array CCD infrared image sensor 3, acousto-optic tunable filter driver 4, image capture module 5, computer 6 and automatic focusing device 7.
After Infrared Acousto-optical Tunable Filter 2 is positioned at infrared lens 1.Infrared Acousto-optical Tunable Filter can adopt the TeO of Brimrose company of the U.S.
2non-co-line style acousto-optic tunable filter, service band is 1000 ~ 1700nm, clear aperture 10 × 10mm, and spectral resolution becomes with diffraction centre wavelength, and excursion is 0.6 ~ 8nm.Peak value diffraction efficiency is 75%, and radiofrequency signal modulation frequency is 60 ~ 130MHz ~ 208MHz.
After indium gallium arsenic area array CCD infrared image sensor 3 is positioned at acousto-optic turnable filter 2.In a specific embodiment, its valid pixel number 320 (H) × 256 (V).Indium gallium arsenic area array CCD infrared image sensor to the infrared ray responsive of 1000-1700nm wave-length coverage, thus has stronger penetration capacity, enhances the detectivity of infrared imaging to potential material evidence.The opto-electronic conversion of this Array CCD transducer settling signal, electric charge read, A/D conversion and digital signal export, and are accompanied with controller and Pierre pastes cooling assembly.
The signal output part of acousto-optic tunable filter driver 4 is connected with the signal input part of Infrared Acousto-optical Tunable Filter 2, generation that frequency resolution is the radio-frequency (RF) driving signal of Hz level, conditioning, amplification and output can be realized, control the work of Infrared Acousto-optical Tunable Filter 2, i.e. the spectral selection of control system.
The picture signal that image capture module 5 exports for gathering indium gallium arsenic area array CCD infrared image sensor 3, and the picture signal of collection is sent to computer 6.Image capture module 4 preferably adopts Camera Link image pick-up card, and image pick-up card is inserted in the slot of computer 6.
The interface of computer 6 is connected with the input of acousto-optic tunable filter driver 4.The output parameter of the configurable acousto-optic tunable filter driver 4 of computer 6, configure the running parameter of indium gallium arsenic area array CCD infrared image sensor 3 and the picture signal of storage of collected by image capture module 5.
As shown in Figure 2.Automatic focusing device 7 comprise stepping motor 71 for focusing to infrared lens 1, stepper motor driving circuit 72, for detecting position-detection sensor 73 and the controller 74 of the focusing position of infrared lens 1.The signal input part of controller 74 is connected with the signal output part of position-detection sensor 73, the lens focusing position detection signal that receiving position detecting sensor 73 exports, the control output end of controller 74 is connected with the input of stepper motor driving circuit 72, the output of stepper motor driving circuit 72 is connected with stepping motor 71, in order to the action of Driving Stepping Motor 71.Controller 74, according to the lens focusing position of setting, sends control signal to stepper motor driving circuit 72, drives infrared lens 1 to move to regulate the focusing position of the infrared lens 1 of front end by stepping motor 71.The current location of the infrared lens 1 detected can be fed back to controller 74 by position-detection sensor 73, and when the position of feeding back and the position consistency of setting, controller 74 control step motor 71 stops, thus realizes automatic focusing.Above-mentioned position-detection sensor 73 can adopt grating scale; Controller 74 can adopt single-chip microcomputer.
Roughly as follows according to the course of work of the infrared imaging evidence-obtaining system based on acousto-optic tunable filter of the utility model one embodiment: target optical spectrum incides in Infrared Acousto-optical Tunable Filter 2 by infrared lens 1, and acousto-optic tunable filter driver 4 produces rf signal and is applied in Infrared Acousto-optical Tunable Filter 2.TeO in Infrared Acousto-optical Tunable Filter 2
2transducer excited crystal surface under radiofrequency signal effect of crystal one end produces ultrasonic wave, diffraction grating is formed at plane of crystal, impact is by the wave propagation of plane of crystal light, like this by changing radiofrequency signal source frequency size, just can change the wavelength of the light wave by Infrared Acousto-optical Tunable Filter 2, thus have object selective light spectrum wavelength, reach the object of light splitting.After Infrared Acousto-optical Tunable Filter 2, the light of selected spectral band is detected by indium gallium arsenic area array CCD infrared image sensor 3, defines the spectrum picture of corresponding spectral band, is finally stored in computer 6 by image capture module 5 collection.By automatic focusing device 7, infrared lens 1 can be adjusted to the focusing position of needs, to obtain gratifying picture rich in detail.
Claims (5)
1. based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter, it is characterized in that: comprise infrared lens, Infrared Acousto-optical Tunable Filter, indium gallium arsenic area array CCD infrared image sensor, acousto-optic tunable filter driver, image capture module and computer;
After described Infrared Acousto-optical Tunable Filter is positioned at described infrared lens, after described indium gallium arsenic area array CCD infrared image sensor is positioned at Infrared Acousto-optical Tunable Filter, the picture signal that described image capture module exports for gathering indium gallium arsenic area array CCD infrared image sensor, and the picture signal of collection is sent to described computer, the interface of computer is connected with the input of described acousto-optic tunable filter driver, and the output of acousto-optic tunable filter driver is connected with the signal input part of Infrared Acousto-optical Tunable Filter.
2. as claimed in claim 1 based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter, it is characterized in that, this infrared imaging evidence-obtaining system also comprises an automatic focusing device, described automatic focusing device comprise stepping motor for focusing to described infrared lens, stepper motor driving circuit, for detecting position-detection sensor and the controller of the focusing position of described infrared lens; The signal input part of described controller is connected with the signal output part of described position-detection sensor, and the control output end of controller is connected with the input of described stepper motor driving circuit, and the output of stepper motor driving circuit is connected with stepping motor.
3., as claimed in claim 2 based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter, it is characterized in that, described controller is single-chip microcomputer.
4., as claimed in claim 2 based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter, it is characterized in that, described position-detection sensor is grating scale.
5., as claimed in claim 1 based on the infrared imaging evidence-obtaining system of acousto-optic tunable filter, it is characterized in that, described image capture module is image pick-up card, and this image pick-up card is inserted in the slot of described computer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106529510A (en) * | 2016-12-12 | 2017-03-22 | 中国科学院合肥物质科学研究院 | Wrinkle recognition method and apparatus for capacitor thin film |
| CN107105200A (en) * | 2017-04-28 | 2017-08-29 | 陕西理工大学 | A kind of collecting image of computer system and its acquisition method for remotely showing |
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2015
- 2015-03-26 CN CN201520174723.3U patent/CN204598152U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106529510A (en) * | 2016-12-12 | 2017-03-22 | 中国科学院合肥物质科学研究院 | Wrinkle recognition method and apparatus for capacitor thin film |
| CN106529510B (en) * | 2016-12-12 | 2019-07-05 | 中国科学院合肥物质科学研究院 | A kind of fold recognition methods and device for capacitor thin film |
| CN107105200A (en) * | 2017-04-28 | 2017-08-29 | 陕西理工大学 | A kind of collecting image of computer system and its acquisition method for remotely showing |
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