CN102879097A - Circular polarization hyperspectral image detection system - Google Patents
Circular polarization hyperspectral image detection system Download PDFInfo
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Abstract
The invention relates to a hyperspectral image detection system capable of simultaneously acquiring left-hand and right-hand circular polarization components of a target. The system includes a pre-positioned collimation system, a double-refraction beam splitting system, an imaging lens and an image acquisition and processing system that are sequentially arranged in the direction of incoming rays. According to the invention, a double-channel circular polarization detection system is adopted to simultaneously acquire an interference figure of the left-hand and right-hand circular polarization components of a target, the detection system improves the capability of acquiring a difference circular polarization spectral image as compared with the single-channel polarization imaging spectrometer only capable of detecting a single linear polarization component, avoids quiver noise as compared with the sequence acquisition technology adopting a rotary component, can be used for acquiring the circular polarization spectral image of the target within a wide band range from the ultraviolet band to the infrared band, and has potential application values in the fields of space exploration, earth remote sensing, machine vision, biomedical diagnosis and the like.
Description
[technical field]
The invention belongs to optical imagery process instrumentation technical field, relate to a kind of Fourier transform imaging spectrometer for the imaging spectral field, particularly a kind of circular polarization high light spectrum image-forming detection system.
[background technology]
The light that target is sent not only has spectral characteristic, and has certain polarization properties, if can quantification ground spectrum and the polarization information of target are described, then can provide strong instrument for target identification and assessment.Current two kinds of important remote sensing technologies can obtaining polarization and spectral information are polarization art and spectroscopy, and their combination then can be carried out many information detections to target.Circularly polarized light is a kind of of polarized light, and nature or man-made target all can reflect or give off circularly polarized light, especially metal surface or scattering medium.In the passive detection field, the energy of circularly polarized light is relatively low, needs the sensitive system of a cover if will survey it.The circular polarization technology is used wider in the active probe field, general method is that artificial circularly polarized light is shone on the Scattering Targets, receive rear orientation light by the circular polarization detection system, utilize the information such as granularity, concentration, distribution and phase place of the left-handed and right-hand circular polarization optical information inverting target in the scattered light, have important using value at material and medical domain.
It mainly is the combination that utilizes quarter-wave plate and line analysis device that early stage circularly polarized light is surveyed, and once can only obtain single left-handed or right-hand circular polarization component.After this people make up thick delayer (fixed delay amount or tunable retardation) and line analysis device, by rotational latency device or tunable delay amount, can not only obtain each circular polarization information, and can obtain other polarization information.Here the circular polarization information of obtaining is the poor of left circularly polarized light and right-circularly polarized light, i.e. the 4th Stokes' parameter.In addition, said method or obtain panchromatic polarization information, or obtain monochromatic polarization information, or obtain the polarization information of a few wave band, all can not carry out the high light spectrum image-forming analysis.
(patent No. is: US7623236B2) [1] had once reported a kind of non-imaging band spectrum polarizing technology to United States Patent (USP), two proportional thick delayers and analyzer combination are placed on the spectrometer front, need not to rotate the spectral information of four Stokes' parameters that can obtain target.The principle of this technology has determined the resolution of each stokes spectrum far below the resolution of spectrometer, numerically is about seven times of spectrometer resolution; And energy will be distributed on seven passages, so it is not high that the measurement sensitivity of component is visited in circular polarization; It can not obtain independent left-handed or right-hand circular polarization component in addition.(patent No. is document [2]: on principle basis 20060170921A1) at United States Patent (USP), two proportional thick delayers and analyzer are made up the imaging spectrometer front that is placed on based on wollaston prism, be used for obtaining simultaneously the spectrum picture information of four Stokes' parameters of target.Although can obtain polarization spectrum imaging, the defective of channel spectrum technology still exists.
The application text of the patent of invention of Chinese patent (number of patent application is 200710017517.1) [3] had once been reported a kind of polarization interference imaging spectrometer of spatial modulation.System adopts the space-time hybrid modulation to obtain technology based on the static birefringent interferometer, has the characteristics such as common road, compactness, stable state and sensitivity height.But the preposition polarizer is fixed, so scan period can only obtain the spectrum picture information of a linear polarization component.The application text of the patent of invention of Chinese patent (number of patent application is 201110260041.0) [4] had once been reported a kind of Double-channel differential polarizing interference imaging spectrometer, polarization spectro technology and birefringent interferometer are combined, in order to the spectrum picture information of the orhtogonal linear polarizaiton component of obtaining simultaneously target.Although above-mentioned two kinds of methods have the advantage of structure and sensitivity, all can't obtain circular polarization information.
List of references
【1】K.Oka,A.Taniguchi?and?H.Okabe,“Spectroscopic?polarimetry”,US?Patent?US7623236B2(2009).
【2】J.C.Jones,M.W.Kudenov，M.G.Stapelbroek,and?E.L.Dereniak,″Infrared?hyperspectral?imaging?polarimeter?using?birefringent?prisms,″Appl.Opt.50,1170-1185(2011).
[3] Chinese patent application numbers 200710017517.1, " static birefringent polarizing inteference imaging spectrometer, " (on October 3rd, 2007).
[4] Chinese patent application numbers 201110260041.0, " a kind of Double-channel differential polarizing interference imaging spectrometer, " (on Dec 28th, 2011).
[summary of the invention]
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of simple and compact for structure, sampling degree of accuracy height, good stability, without spin with tuning part, can obtain simultaneously the circular polarization high light spectrum image-forming detection system of the spectrum picture information of the left-handed of target and right-hand circular polarization component.
For achieving the above object, the present invention is achieved by the following technical solutions.
A kind of circular polarization high light spectrum image-forming detection system is comprised of the incident light colimated light system that sets gradually along the incident light direction, birefringence beam splitting system, imaging len and Image Acquisition and disposal system; A branch of circularly polarized light that target is sent is by the directional light behind the incident light colimated light system collimation, by the angle beam splitting in paper plane of birefringence beam splitting system, forms in twos parallel four bundle light of the direction of propagation and polarization direction; Wherein the two bundle polarized lights that are divided into through the birefringence beam splitting system of the Left-hand circular polarization component in the directional light behind the incident light colimated light system collimation will produce the interference image of left-hand polarization component after imaging len is assembled; The two bundle polarized lights that right-hand circular polarization component in the directional light behind the incident light colimated light system collimation is divided into through the birefringence beam splitting system will produce the interference image of dextropolarization component after imaging len is assembled; Image Acquisition and disposal system are obtained left-handed and interference image corresponding to right-hand circular polarization component simultaneously.
The present invention further improves and is: left-handed and interference image corresponding to right-hand circular polarization component are carried out Fourier transform for Image Acquisition and disposal system and image co-registration is processed the spectrum picture information that obtains the left-handed of target and right-hand circular polarization component.
The present invention further improves and is: the incident light colimated light system is by forming to the object lens that set gradually, field stop and collimating mirror along incident light; Field stop is positioned on the image planes of object lens, also is the object space focal plane of collimation lens simultaneously.
The present invention further improves and is: object lens are telephotolens, microcobjective or common object lens; When object lens were telephotolens, target was positioned at the infinite distance distance; When object lens were microcobjective or common object lens, target was positioned at finite distance.
The present invention further improves and is: the birefringence beam splitting system by along incident light to the achromatic quarter waveplate that sets gradually, birefringent prism to, birefringent waveplates plate to and polarizer form; Direction along incident light transmission is the z direction of principal axis, is the y direction of principal axis perpendicular to the vertical direction of z axle, is the x direction of principal axis perpendicular to the horizontal direction of z axle, and x axle, y axle, z axle three meet right-hand screw rule; Wherein the angle of the fast and slow axis of achromatic quarter waveplate and x axle be respectively ± 45 °; The angle of the optical axis that birefringent prism is right and x axle is respectively 0 ° and 90 °; The angle of the optical axis that the birefringent waveplates plate is right and z axle is 45 °, and its left plate optical axis is-45 ° in the projection on xy plane and the angle of x axle, and the right panel optical axis is 45 ° in the projection on xy plane and the angle of x axle; The direction of thoroughly shaking of polarizer is parallel to the x axle.
The present invention further improves and is: polarizer is crystal prism type polaroid, dichroic polarizing sheet or wire grating polaroid.
The present invention further improves and is: Image Acquisition is processed by planar array detector, connection wire and data with disposal system and display system forms.
The present invention further improves and is: planar array detector places on the focal plane, picture side of imaging len; Planar array detector is silica-based CCD camera, CMOS camera or infrared focal plane array.
With respect to prior art, the present invention has the following advantages: the present invention can obtain the polarization spectrum image of the left-handed of target and right-hand circular polarization component simultaneously; Make up the polarized component of detection of Duoing than the quarter-wave plate that obtains single circular component and polaroid, and have the hyperspectral analysis function; Compare with the combination of line analysis device with the thick delayer of rotation or tunable delayer, do not have moving-member or electric transition element, can effectively avoid vibration noise, and belong to passive beam splitting system; Compare with the channel spectrum polarization technology, the spectral resolution of native system is exactly the resolution of interferometer, has the ability of high light spectrum image-forming; And only survey two circular component, the optics utilization ratio is higher; Compare with binary channels linear polarization imager with single channel linear polarization imaging spectrometer, increased the acquisition capability of circular polarization spectrum picture.The present invention adopts altogether light path system of birefringence, without moving-member, have the advantages such as stable, microminiature, real-time, all have extremely important using value at aspects such as space exploration, earth remote sensing, machine vision and biomedical diagnostic fields, can be widely used in Deep Space Target Detection, atmospheric surveillance, earth resources and pollute the key areas such as generaI investigation, camouflaged target identification, material properties discriminating, focus diagnosis.
[description of drawings]
Fig. 1 is light channel structure figure of the present invention.
[embodiment]
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Referring to accompanying drawing 1, circular polarization high light spectrum image-forming detection system of the present invention is by forming to the incident light colimated light system 100 that sets gradually, birefringence beam splitting system 200, imaging len 300 and Image Acquisition and disposal system 400 along incident light.
Incident light colimated light system 100 is by forming to the object lens 102 that set gradually, field stop 103 and collimation lens 104 along incident light; Birefringence beam splitting system 200 by along incident light to the achromatic quarter waveplate 201 that sets gradually, birefringent prism to 202, the birefringent waveplates plate to 203 and polarizer 204 form; Image Acquisition is connected by planar array detector 401, is connected wire 402 and data are processed and display system 403 forms with disposal system;
The principle of work of circular polarization high light spectrum image-forming detection system of the present invention is: the light that is sent by target 101 is imaged on field stop 103 places through object lens 102, is called intermediate image plane; Wherein object lens 102 both can be telephotolens, microcobjective or common object lens; When object lens 102 were telephotolens, target 101 should be positioned at the infinite distance distance; When object lens were microcobjective or common object lens, target should be positioned at finite distance.Field stop 103 is positioned on the object space focal plane of collimation lens 104, is used for preventing that the interference image of two passages from overlapping phenomenon occurring at planar array detector.The light that intermediate image plane on the field stop 103 is sent incides on the achromatic quarter waveplate 201 through becoming directional light behind the collimation lens 104; Left-handed and right-hand circular polarization component in the incident light will be converted into respectively the horizontal and vertical linearly polarized light by behind the achromatic quarter waveplate 201; Wherein achromatic quarter waveplate 201 can guarantee that system can be than broadband work.To will be in the beam splitting of y deflection after 202, the two-beam that separates still be that the horizontal and vertical linearly polarized light is incorporated into and is mapped to the birefringent waveplates plate on 203 to the horizontal and vertical linearly polarized light by birefringent prism; From birefringent prism to the horizontal linear polarization light of 202 outgoing behind the birefringent waveplates plate 203, will be that parallel and polarization direction, the two bundle directions of propagation and x axle clamp angle are respectively ± 45 ° linearly polarized light by lateral shear in the x direction; From birefringent prism to the perpendicular linear polarization light of 202 outgoing behind birefringent waveplates plate 203, will be that two bundle directions of propagation angle parallel and polarization direction and x axle is respectively 45 ° and 135 ° of linearly polarized lights by lateral shear in the x direction equally.After above-mentioned polarization direction linearly polarized light perpendicular to each other was parallel to the polarizer 204 of x axle through the direction of thoroughly shaking, the x direction was all arrived by naturalization in the polarization direction, interfered the required necessary condition with identical polarized component thereby satisfy; Behind imaging len 300, will be focused onto the both sides of the planar array detector 401 that is on the focal plane, produce respectively two width of cloth interference images after intersecting.The Left-hand circular polarization component in the corresponding incident light of a width of cloth interferogram wherein, right-hand circular polarization component in the corresponding incident light of another width of cloth interferogram, adopt the image pick-up card with planar array detector 401 compatibilities, interferogram is transferred in data processing and the display system 403 through connecting wire 402, utilizes processing and inversion algorithm to restore respectively left-handed and the high spectrum image right-hand circular polarization component.Used polarizer 204 can be that crystal prism type, dichroic polarizing sheet, wire grating polaroid or other can be at the polarizers of wide spectrum work.Wherein, planar array detector 401 can be silica-based CCD camera, CMOS camera or infrared focal plane array etc.
In order to obtain the sequence interference image of finishing, system can be equipped on the aircraft platform or be placed on ground rotation or the translation stage or with microscope interfaces and utilize sample translation stage etc., system and target are at the uniform velocity relatively moved in the horizontal direction carry out window and sweep detection, the optical path difference that relies on field angle to change to modulate two width of cloth interference images, the optical path difference of two width of cloth interferograms changes identical, and a window cycle of sweeping can obtain the complete sequence interference image of the left-handed of target and right-hand circular polarization component; Utilize the data handling system of computing machine that two width of cloth interference images are carried out the spectrum picture that Fourier transform can obtain the left-handed of target and right-hand circular polarization component; Two spectrum pictures subtract each other the difference circular polarization spectrum picture information that can also obtain high-contrast.
Claims (8)
1. circular polarization high light spectrum image-forming detection system, it is characterized in that, formed by the incident light colimated light system (100) that sets gradually along the incident light direction, birefringence beam splitting system (200), imaging len (300) and Image Acquisition and disposal system (400); A branch of circularly polarized light that target is sent is by the directional light behind incident light colimated light system (100) collimation, by birefringence beam splitting system (200) angle beam splitting in paper plane, forms in twos parallel four bundle light of the direction of propagation and polarization direction; Wherein the two bundle polarized lights that are divided into through birefringence beam splitting system (200) of the Left-hand circular polarization component in the directional light behind incident light colimated light system (100) collimation will produce the interference image of left-hand polarization component after imaging len (300) is assembled; The two bundle polarized lights that right-hand circular polarization component in the directional light behind incident light colimated light system (100) collimation is divided into through birefringence beam splitting system (200) will produce the interference image of dextropolarization component after imaging len (300) is assembled; Image Acquisition and disposal system (400) are obtained left-handed and interference image corresponding to right-hand circular polarization component simultaneously.
2. circular polarization high light spectrum image-forming detection system according to claim 1 is characterized in that, incident light colimated light system (100) by along incident light to the object lens that set gradually (102), field stop (103) and collimating mirror (104) form; Field stop (103) is positioned on the image planes of object lens (102), also is the object space focal plane of collimation lens (104) simultaneously.
3. circular polarization high light spectrum image-forming detection system according to claim 2 is characterized in that, object lens (102) are telephotolens, microcobjective or common object lens; When object lens (102) were telephotolens, target (101) was positioned at the infinite distance distance; When object lens (102) were microcobjective or common object lens, target (101) was positioned at finite distance.
4. circular polarization high light spectrum image-forming detection system according to claim 1, it is characterized in that, birefringence beam splitting system (200) by along incident light to the achromatic quarter waveplate that sets gradually (201), birefringent prism forms (203) and polarizer (204) (202), birefringent waveplates plate; Direction along incident light transmission is the z direction of principal axis, is the y direction of principal axis perpendicular to the vertical direction of z axle, is the x direction of principal axis perpendicular to the horizontal direction of z axle, and x axle, y axle, z axle three meet right-hand screw rule; The fast and slow axis of achromatic quarter waveplate (201) and the angle of x axle be respectively ± and 45 °; Birefringent prism is respectively 0 ° and 90 ° to the optical axis of (202) and the angle of x axle; The birefringent waveplates plate is 45 ° to the optical axis of (203) and the angle of z axle, and its left plate optical axis is-45 ° in the projection on xy plane and the angle of x axle, and the right panel optical axis is 45 ° in the projection on xy plane and the angle of x axle; The direction of thoroughly shaking of polarizer (204) is parallel to the x axle.
5. circular polarization high light spectrum image-forming detection system according to claim 4 is characterized in that, polarizer (204) is crystal prism type polaroid, dichroic polarizing sheet or wire grating polaroid.
6. circular polarization high light spectrum image-forming detection system according to claim 1 is characterized in that Image Acquisition is connected 400 with disposal system) formed by planar array detector (401), connection wire (402) and data processing and display system (403).
7. circular polarization high light spectrum image-forming detection system according to claim 6 is characterized in that, planar array detector (401) places on the focal plane, picture side of imaging len (300); Planar array detector (401) is silica-based CCD camera, CMOS camera or infrared focal plane array.
8. circular polarization high light spectrum image-forming detection system according to claim 1, it is characterized in that, left-handed and interference image corresponding to right-hand circular polarization component are carried out Fourier transform for Image Acquisition and disposal system (400) and image co-registration is processed the spectrum picture information that obtains the left-handed of target and right-hand circular polarization component, and the difference of two circular polarization component obtains difference circular polarization spectrum picture information.
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| CN107192455A (en) * | 2017-05-17 | 2017-09-22 | 西安交通大学 | Image, high-resolution intensity spectrum and linear polarization spectral detection device and method |
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| CN108873366A (en) * | 2018-06-27 | 2018-11-23 | 河海大学 | Multi-band Polarization light splitting and integrated approach and system |
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| CN106197670A (en) * | 2015-05-28 | 2016-12-07 | 广西师范学院 | A kind of double mode full polarization imaging surveys folk prescription method |
| CN107153053A (en) * | 2016-03-04 | 2017-09-12 | 中国科学院大连化学物理研究所 | A kind of multichannel circular polarization XRF |
| CN107192455B (en) * | 2017-05-17 | 2019-04-12 | 西安交通大学 | Image, high-resolution intensity spectrum and linear polarization spectral detection device and method |
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| CN107036713A (en) * | 2017-05-17 | 2017-08-11 | 西安交通大学 | Image, high-resolution intensity spectrum and linear polarization spectrum investigating system and method |
| CN107036713B (en) * | 2017-05-17 | 2019-04-12 | 西安交通大学 | Image, high-resolution intensity spectrum and linear polarization spectrum investigating system and method |
| CN107228711A (en) * | 2017-07-13 | 2017-10-03 | 西安交通大学 | Compact miniature fast illuminated channel modulation full-polarization spectrum imaging detection device and method |
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