CN104535190A - Corner shearing type spatial frequency modulation full-polarization imaging detecting device - Google Patents
Corner shearing type spatial frequency modulation full-polarization imaging detecting device Download PDFInfo
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- CN104535190A CN104535190A CN201410853994.1A CN201410853994A CN104535190A CN 104535190 A CN104535190 A CN 104535190A CN 201410853994 A CN201410853994 A CN 201410853994A CN 104535190 A CN104535190 A CN 104535190A
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Abstract
The invention relates to a corner shearing type spatial frequency modulation full-polarization imaging detecting device. The corner shearing type spatial frequency modulation full-polarization imaging detecting device comprises a front-loading optical system, a corner shearing type polarization modulation module, an imaging microscopic group, a signal area array detector and a data collecting processing module connected with the signal area array detector. The front-loading optical system is used for collecting and collimating target light and eliminating stray light; a polarization modulation system is used for modulating the collimated incident light to be at different spatial frequencies and enables the incident light to be separated at the spatial frequencies; the imaging microscopic group is used for focusing the modulated incident light to the signal area array detector; the signal area array detector is used for receiving emergent light of the imaging microscopic group, obtaining images of the target light and all pieces of polarization information, and outputting electrical signals to the data collecting processing module; the data collecting processing module is used for conducting filtering and Fourier transformation on the electrical signals, and two-dimensional space images of a target and the polarization information including four Stokes vectors are demodulated to be displayed as pseudo-color pictures.
Description
Technical field
The present invention relates to technical field of optical instrument, be specially a kind of angle shearing-type Space Frequency Modulation full polarization imaging sniffer.
Background technology
Target is in the process of radiation, reflection, transmission and diffuse lightwave, capital causes the change of light wave intensity and polarization state, wherein camera (imager) can obtain the two-dimensional space information of target, and polarimeter can the information such as surface properties of detecting object.Afterwards, camera merged mutually with polarimeter technology, defined and can obtain the two-dimensional space information of target and the polarization imaging detection device of polarization information simultaneously.
Polarization imaging detection device initial rotating polarization element type structure, owing to having moving component, this device vibration resistance is poor, can not carry out real-time detection to target polarization information.Developed again on this basis and adopted the modulation systems such as electric light, acousto-optic, magneto-optic to obtain the polarization image in different polarization direction according to this according to sequential, obtain the polarization characteristic of target, the method can not carry out real-time detection to target polarization information equally.People also been proposed the detection mode that can carry out Real-time Obtaining target polarization information, 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
The invention provides a kind of light channel structure compact, without kinematic optical device, can the angle shearing-type Space Frequency Modulation 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:
Angle of the present invention shearing-type Space Frequency Modulation full polarization imaging sniffer, comprise the preposition optical system, angle shearing-type Polarization Modulation module, imaging lens group and the signal face array detector that arrange along optical transmission direction order, 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, angle shearing-type 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 is made up of four pieces of birefringent wedge crystal, wherein two pieces of birefringent wedge crystal of incident light side form first jiao of shearing-type prism, its optical axis of crystal direction is mutually vertical, two pieces of birefringent wedge crystal of emergent light side form second jiao of shearing-type prism, its optical axis of crystal direction is mutually vertical, and respectively with optical axis of crystal direction angle at 45 ° in first jiao of shearing-type prism.
Preferably, the focal plane of imaging lens group is positioned on follow-up planar array detector.
Preferably, 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 angle shearing-type 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 entering angle shearing-type Polarization Modulation module, spatial frequency is modulated incident light, four components of incident light Stokes vector is modulated in different spatial frequencys, makes 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 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 in angle shearing-type 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 angle shearing-type 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 first jiao of shearing-type prism, and 222 is second jiao of shearing-type prism; 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, angle shearing-type 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 the preposition optical system lens group 11 of coaxial order successively setting, diaphragm 12 and preposition optical system as mirror group 13, for gathering and collimated object light, and eliminating parasitic light.
Angle shearing-type 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 is made up of four pieces of birefringent wedge crystal, wherein front two pieces of birefringent wedge crystal composition angle shearing-type prism 221, its optical axis of crystal direction is mutually vertical, rear two pieces of birefringent wedge crystal composition angle shearing-type prism 222, its optical axis of crystal direction is mutually vertical, and respectively with 221 in optical axis of crystal direction angle at 45 °, as shown in Figure 2.Angle shearing-type 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 information faces 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, entering angle shearing-type Polarization Modulation module 2 carries out Polarization Modulation, target light becomes line polarisation through the first polariscope 21 of this module, two-beam is become again through jiao shearing-type prism 221 of first above, 4 bundle light are become again through jiao shearing-type prism 222 of second below, 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. angle shearing-type Space Frequency Modulation full polarization imaging sniffer, it is characterized in that, comprise arrange along optical transmission direction order preposition optical system (1), angle shearing-type 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. angle shearing-type Space Frequency Modulation 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. angle shearing-type Space Frequency Modulation full polarization imaging sniffer according to claim 1, it is characterized in that, angle shearing-type 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. angle shearing-type Space Frequency Modulation full polarization imaging sniffer according to claim 3, it is characterized in that, birefringece crystal group (22) is made up of four pieces of birefringent wedge crystal, wherein two pieces of birefringent wedge crystal of incident light side form first jiao of shearing-type prism (221), its optical axis of crystal direction is mutually vertical, two pieces of birefringent wedge crystal of emergent light side form second jiao of shearing-type prism (222), its optical axis of crystal direction is mutually vertical, and respectively with optical axis of crystal direction angle at 45 ° in first jiao of shearing-type prism (221).
5. angle shearing-type Space Frequency Modulation full polarization imaging sniffer according to claim 1, it is characterized in that, the focal plane of imaging lens group (3) is positioned on follow-up planar array detector (4).
6. angle shearing-type Space Frequency Modulation full polarization imaging sniffer according to claim 1, 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. angle shearing-type Space Frequency Modulation 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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| CN106872037A (en) * | 2017-02-22 | 2017-06-20 | 西安交通大学 | Fast illuminated compact optical field imaging full-polarization spectrum detection device and method |
| CN106949967A (en) * | 2017-02-22 | 2017-07-14 | 西安交通大学 | The fast compact channel modulation type optical field imaging full-polarization spectrum detection device of illuminated and method |
| 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 |
| 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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| 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: Zhao Yan Inventor after: Zhang Song Inventor after: Long Jianqian Inventor after: Jiao Jiao Inventor after: Yi Kai Inventor before: Zhang Hualiang Inventor before: Xie Yongjie Inventor before: Zhao Yan Inventor before: Zhang Song Inventor before: Long Jianqian Inventor before: Jiao Jiao Inventor before: Yi Kai |
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Application publication date: 20150422 |