CN104535189A - Coaxial static space frequency modulation full-polarization imaging detector - Google Patents
Coaxial static space frequency modulation full-polarization imaging detector Download PDFInfo
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- CN104535189A CN104535189A CN201410850597.9A CN201410850597A CN104535189A CN 104535189 A CN104535189 A CN 104535189A CN 201410850597 A CN201410850597 A CN 201410850597A CN 104535189 A CN104535189 A CN 104535189A
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Abstract
The invention provides a coaxial static space frequency modulation full-polarization imaging detector. The detector comprises a front-arranged optical system, a Savart panel type polarization modulation module, an imaging lens set, a signal area array detecting device, and a data collecting and processing module connected with the signal area array detecting device, wherein the front-arranged optical system, the Savart panel type polarization modulation module, the imaging lens set, the signal area array detecting device and the data collecting and processing module are sequentially arranged in the light transmitting direction. The front-arranged optical system is used for collecting and collimating target light and eliminating stray light; the polarization modulation system is used for modulating collimated incident light to different spatial frequencies to enable the light to be mutually separated on the spatial frequencies; the imaging lens set is used for focusing the modulated incident light onto the signal area array detecting device; the signal area array detecting device is used for receiving emergent light of the imaging lens set, obtaining an image and all pieces of polarization information of the target light, and outputting electrical signals to the data collecting and processing module; the data collecting and processing system is used for carrying out filtering and Flourier transforming on the electrical signals, demodulating a two-dimensional spatial image of a target and all pieces of polarization information comprising four Stokes vectors, and displaying a pseudo-color image.
Description
Technical field
The present invention relates to technical field of optical instrument, be specially a kind of coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer.
Background technology
Polarization imaging Detection Techniques are fusions of camera (imager) and polarization technology, can obtain two-dimensional space information and the polarization information of target simultaneously.Polarization imaging Detection Techniques are international study hotspots from the eighties in 20th century always, and this technology is widely used in the technical fields such as atmospheric exploration, earth resources survey, medical diagnosis, target detection identification and machine vision at present.
The detection mode of polarization imaging device is initially time-ordered measurement mode, the modulation systems such as which rotating polarization element type structure or employing electric light, acousto-optic, magneto-optic obtain the polarization image in different polarization direction according to this according to sequential, obtain the polarization characteristic of target, owing to having moving component in the method, vibration resistance is poor, can not carry out real-time detection to target polarization information.There has been proposed the detection mode that can carry out Real-time Obtaining target polarization information afterwards, spatial match metering system and intensity modulation type polarization imaging mode.Spatial match metering system application many groups polarimetry unit spatially combines the polarization characteristic obtaining same target, comprise a point amplitude type, point Xing Hefen focal plane, aperture type, divide amplitude type and a point aperture type complex structure, optical path adjusting difficulty, and owing to using multiplex optical element and detector simultaneously, the difference of the polarization response of element and detector will bring larger measuring error; Point focal plane type then requires the film in integrated multiple different polarization printing opacity direction on one piece of detector array, and technological requirement is high, and process is very complicated.Cause luminous flux not high containing diaphragm in intensity modulation type polarization imaging device, this device light path is complicated and technological requirement is high, and containing spectrometer architecture, conversion speed is slower.
Summary of the invention
For problems of the prior art, the invention provides a kind of light channel structure compact, without kinematic optical device, can the coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer of disposable acquisition target two-dimensional space picture and whole polarization informations.
The present invention is achieved through the following technical solutions:
Coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer, comprise the preposition optical system arranged along optical transmission direction order, Savart template Polarization Modulation module, imaging lens group and signal face array detector, and the digital sampling and processing be connected with signal face array detector; Preposition optical system is used for gathering and collimated object light, and eliminates parasitic light; Polarization Modulation system for by collimation after the incident beam modulated to different spatial frequencys, make it be separated from each other in spatial frequency; Imaging lens group for by modulation after focus incoming light to signal face array detector; Signal face array detector, for receiving the emergent light of imaging lens group, obtains the image of target light and whole polarization information, and the electric signal exported is to digital sampling and processing; Data acquisition processing system is used for carrying out filtering and Fourier transform to electric signal, demodulates the two-dimensional space image of target simultaneously and comprises whole polarization informations of four Stokes vectors, and being shown as pseudo-colours picture.
Preferably, preposition optical system comprises the objective lens set gradually by light path order, diaphragm and picture mirror group.
Preferably, Savart template Polarization Modulation module is made up of the first polaroid set gradually along light path order or polarizing prism, birefringece crystal group and the second polaroid or polarizing prism.
Further, birefringece crystal group comprises the Savart plate set gradually along light path order, half-wave plate and the 2nd Savart plate.
Preferably, the focal plane of imaging lens group is positioned on signal face array detector.
Further, signal face array detector adopts ccd array, CMOS array, photodiode array, photomultiplier tube array, infrared focal plane array or ultraviolet light detector array.
Preferably, digital sampling and processing adopts the information that planar array detector can be received to carry out the computing machine of spatial filtering and Fourier transform process operation.
Compared with prior art, the present invention has following useful technique effect:
The Polarization Modulation module that the present invention adopts Savart template birefringece crystal to form carries out Space Frequency Modulation to four Stokes vectors: adopt preposition optical system to carry out collimator and extender to target incident light and become directional light; Then enter Savart template Polarization Modulation module, spatial frequency carries out spatial modulation to incident light, four components of incident light Stokes vector are modulated in different spatial frequencys, make it be separated from each other in spatial frequency; Incident light after modulation interferes after imaging lens group, forms the image of interference fringe modulation on the detector, not only includes the intensity signal of incident light, and include whole polarization informations of incident light in this image; Carry out spatial filtering and Fourier transform to the image information obtained, final realization obtains the two-dimensional space image of target simultaneously and comprises whole polarization informations of four Stokes vectors.Adopt the setting that light path is coaxial, structure is simple, and same set of light path can obtain target two-dimensional space image simultaneously and comprise whole polarization informations of four Stokes vectors.
Further, by the restriction formed each module, except signal face array detector, the components and parts in all light paths are full light work, and not containing moving component, the light path making it be formed has static and full light advantage; The complete real-time detection to polarization information can be realized.
Accompanying drawing explanation
Fig. 1 is the structural representation of device described in example of the present invention.
Fig. 2 is the structural representation of birefringece crystal group in Savart template Polarization Modulation module in example of the present invention.
In figure: 1 is preposition optical system, 11 is objective lens, and 12 is diaphragm, 13 picture mirror groups; 2 is Savart template Polarization Modulation module, and 21 is the first polaroid or polarizing prism, and 22 is birefringece crystal group, and 23 is the second polaroid or polarizing prism; 221 is a Savart plate, and 222 is half-wave plate, and 223 is the 2nd Savart plate; 3 is imaging lens group; 4 is signal face array detector; 5 is digital sampling and processing.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
Device of the present invention, as shown in Figure 1, it comprises preposition optical system 1, Savart template Polarization Modulation module 2, imaging lens group 3 and the signal face array detector 4 coaxially arranged successively with target light source, the digital sampling and processing 5 be connected with signal face array detector 4.
Wherein, as shown in Figure 1, preposition optical system 1 is positioned at whole device foremost, comprising preposition optical system lens group 11, diaphragm 12 and preposition optical system image space mirror group 13 that coaxial order is successively arranged, for gathering and collimated object light, and eliminating parasitic light.
Savart template Polarization Modulation module 2 is positioned at after preposition optical system 1, is made up of the first polaroid or polarizing prism 21, birefringece crystal group 22 and subsequent the second polaroid or polarizing prism 23; Birefringece crystal group 22 comprises the Savart plate 221 arranged in order, half-wave plate 222, the 2nd Savart plate 223, as shown in Figure 2.Savart template Polarization Modulation module 2 pairs of incident lights are modulated in spatial frequency, four components of incident light Stokes vector are modulated in different spatial frequencys, make it be separated from each other in spatial frequency.
Imaging lens group 3 is for focusing on detector by emergent light, and its focal plane is positioned on follow-up planar array detector 4.
Signal face array detector 4 adopt in ccd array, CMOS array, photodiode array, photomultiplier tube array, infrared focal plane array or ultraviolet light detector array any one, for receiving the emergent light of imaging lens group 3, obtain the image of target light and whole polarization information, the electric signal that signal face array detector 4 exports is sent into follow-up signal and is obtained and disposal system 5.
The computing machine that digital sampling and processing 5 carries out Fourier transform process by the information that signal face array detector 4 can be received is formed, for demodulating the two-dimensional space image of target and comprising whole polarization informations of four Stokes vectors, and be shown as pseudo-colours picture.
Apparatus of the present invention are in use: after the light that target light source sends is collimated by preposition optical system 1, enter Savart template Polarization Modulation module 2 and carry out Polarization Modulation, target light becomes two-beam through a Savart plate 221 of this module, this two-beam rotates 45 ° respectively by half-wave plate rear polarizer direction, 4 bundle light are become again through the 2nd Savart plate 222, the light path that this 4 bundle light passes through is different, so it is by becoming the coherent light beam with identical polarization direction and fixed skew after polariscope 23, after imaging lens group 3, the planar array detector 4 be positioned on imaging lens focal plane forms interference pattern, thus, four components of incident light Stokes vector are modulated onto in different spatial frequencys, spatial frequency is separated from each other, the signal that signal face array detector 4 receives carries out image and the polarization information that can obtain target after spatial filtering and Fourier transform process through digital sampling and processing 5 again.
Claims (7)
1. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer, it is characterized in that, comprise the preposition optical system (1) arranged along optical transmission direction order, Savart template Polarization Modulation module (2), imaging lens group (3) and signal face array detector (4), and the digital sampling and processing (5) be connected with signal face array detector (4);
Preposition optical system (1) for gathering and collimated object light, and eliminates parasitic light;
Polarization Modulation system (2) for by collimation after the incident beam modulated to different spatial frequencys, make it be separated from each other in spatial frequency;
Imaging lens group (3) for by modulation after focus incoming light to signal face array detector (4);
Signal face array detector (4), for receiving the emergent light of imaging lens group (3), obtains the image of target light and whole polarization information, and the electric signal exported is to digital sampling and processing (5);
Data acquisition processing system (5), for carrying out filtering and Fourier transform to electric signal, demodulates the two-dimensional space image of target simultaneously and comprises whole polarization informations of four Stokes vectors, and being shown as pseudo-colours picture.
2. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer according to claim 1, it is characterized in that, preposition optical system (1) comprises the objective lens (11) set gradually by light path order, diaphragm (12) and picture mirror group (13).
3. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer according to claim 1, it is characterized in that, Savart template Polarization Modulation module (2) is made up of the first polaroid set gradually along light path order or polarizing prism (21), birefringece crystal group (22) and the second polaroid or polarizing prism (23).
4. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer according to claim 3, it is characterized in that, birefringece crystal group (22) comprises the Savart plate (221) set gradually along light path order, half-wave plate (222) and the 2nd Savart plate (223).
5. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer according to claim 1, it is characterized in that, the focal plane of imaging lens group (3) is positioned on signal face array detector (4).
6. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer according to claim 1 or 5, it is characterized in that, signal face array detector (4) adopts ccd array, CMOS array, photodiode array, photomultiplier tube array, infrared focal plane array or ultraviolet light detector array.
7. coaxial Static-state Space frequency modulation (PFM) full polarization imaging sniffer according to claim 1, it is characterized in that, digital sampling and processing (5) adopts the computing machine that the information that planar array detector (4) receive can be carried out spatial filtering and Fourier transform process operation.
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| CN105181141A (en) * | 2015-09-22 | 2015-12-23 | 中国科学院光电研究院 | Heterodyne polarization interference spectral imaging method and spectrometer |
| CN105258801A (en) * | 2015-11-11 | 2016-01-20 | 北京航空航天大学 | Polarization characteristic detection system of polarized light after passing through spherical alkali metal air chamber |
| CN110514598A (en) * | 2019-08-20 | 2019-11-29 | 北京理工大学 | A kind of the spectrum polarizing detection system and detection method of frequency domain modulation |
| CN112326203A (en) * | 2020-10-28 | 2021-02-05 | 桂林电子科技大学 | Method for determining imaging system parameters through interference fringe central area data |
| CN112326032A (en) * | 2020-10-28 | 2021-02-05 | 桂林电子科技大学 | Method for increasing polarization information based on multiband incident light polarization imaging |
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| CN105181141A (en) * | 2015-09-22 | 2015-12-23 | 中国科学院光电研究院 | Heterodyne polarization interference spectral imaging method and spectrometer |
| CN105258801A (en) * | 2015-11-11 | 2016-01-20 | 北京航空航天大学 | Polarization characteristic detection system of polarized light after passing through spherical alkali metal air chamber |
| CN105258801B (en) * | 2015-11-11 | 2017-07-11 | 北京航空航天大学 | One kind passes through spherical alkali metal air chamber rear polarizer light polarization detecting system |
| CN110514598A (en) * | 2019-08-20 | 2019-11-29 | 北京理工大学 | A kind of the spectrum polarizing detection system and detection method of frequency domain modulation |
| CN112326203A (en) * | 2020-10-28 | 2021-02-05 | 桂林电子科技大学 | Method for determining imaging system parameters through interference fringe central area data |
| CN112326032A (en) * | 2020-10-28 | 2021-02-05 | 桂林电子科技大学 | Method for increasing polarization information based on multiband incident light polarization imaging |
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Inventor after: Zhang Hualiang Inventor after: Xie Yongjie Inventor after: Zhang Song Inventor after: Zhao Yan Inventor after: Long Jianqian Inventor after: Jiao Jiao Inventor after: Yi Kai Inventor before: Zhang Hualiang Inventor before: Xie Yongjie Inventor before: Zhang Song Inventor before: Zhao Yan Inventor before: Long Jianqian Inventor before: Jiao Jiao Inventor before: Yi Kai |
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Application publication date: 20150422 |
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