CN106802184B - The fast compact noise immunity type optical field imaging full-polarization spectrum detection device of illuminated and method - Google Patents
The fast compact noise immunity type optical field imaging full-polarization spectrum detection device of illuminated and method Download PDFInfo
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Abstract
The present invention discloses a kind of compact noise immunity type optical field imaging full-polarization spectrum detection device of fast illuminated and method, device include object lens, light field modulation unit, micro optical array, planar array detector and data acquisition process display system；Object lens, light field modulation unit, micro optical array and planar array detector are along incident light to setting gradually；Light field modulation unit is placed in the aperture diaphragm position of object lens, and micro optical array is placed in the image planes position of object lens, and planar array detector is placed on the back focal plane of micro optical array, and is connected with data acquisition process display system；Light field modulation unit includes Polarization Modulation module and spectral filtering chip arrays.The device of the invention is suitable for detecting dynamic or the fast all-optical information for becoming target, can be effectively prevented from the negative effect as brought by the factors such as object variations, jittering noise or environmental change, has potential application in fields such as astronomical observation, space exploration, earth remote sensing, machine vision and biomedical diagnostics.
Description
Technical field
The invention belongs to optical remote sensing field of detecting, in particular to a kind of polarization spectrum imaging device.
Background technique
The important remote sensing informations such as space, spectrum and polarization in the electromagnetic wave of object radiation containing target, can be used not only for
The characteristics such as the form of inverting target and physical chemistry, moreover it is possible to remove ambient noise provide the surface of high contrast, pattern, shade and
The information such as roughness.To make space, spectrum and polarization three-dimensional information have complementary advantages, the energy of target in enhancing detection complex background
Power has come into being and has integrated the novel forward position remote sensing that three-dimensional information obtains technical ability: polarization spectrum imaging technology.
Its data product both can be considered the corresponding multidimensional polarization image of each wavelength, also be considered as the corresponding spectrum picture of each polarization state,
To improve target acquisition, identification and classification efficiency and precision have certain potentiality, military surveillance, earth resource generaI investigation,
Many necks such as environmental health monitoring and surveilliance, natural calamity forecast, Atmospheric Survey, astronomical observation, the bionical, biomedical diagnostic of machine vision
It domain all will be with important application value and prospect.
Polarization spectrum imaging technology is merged by Polarization Modulation module and spectrum module, itself both rear work
Feature decides the former characteristic.If dividing in the way of the polarization and spectral information for obtaining two-dimensional space target, Polarization Modulation
Module and spectrum module can be divided into sequential keyboard encoder and fast illuminated two major classes.Currently, most of polarization spectrum imaging technologies are all
The polarization spectrum image that two-dimensional scene is obtained using sequence scanning mode (such as Frame projection, push-broom type or window sweep formula), is needed never
The polarization spectrum image of two-dimensional space target is extracted and recombinated in the multiple image data obtained in the same time.The technology being related to is main
It is by sequential keyboard encoder Polarization Modulation module in conjunction with fast illuminated spectrum module, or by sequential keyboard encoder Polarization Modulation module and timing
Formula spectrum module combines, or by fast illuminated Polarization Modulation module in conjunction with sequential keyboard encoder spectrum module.Timing acquisition
Technology is unsuitable for dynamic or quick variation targets, and the unstability of atmosphere or ambient enviroment also will affect image quality, it is also necessary to
Accurate space positioning system.
In contrast, fast illuminated Polarization Modulation module and fast illuminated spectrum module are organically blended, it can be quickly real
When detect the polarization spectrum image of two-dimensional space target, not only increase working efficiency, when also can effectively avoid multiple measurement because
Environmental change and bring influence, therefore fast illuminated polarization spectrum imaging technology is the Main way of current and future development, tool
There is important application potential.Current fast illuminated full-polarization spectrum imaging device is mainly based upon compression sensing and calculating computed tomography meter
It calculates, not only system complex, it is also necessary to heavy data reconstruction inversion algorithm.In addition, when optical system is by Gaussian noise or photon
When influence of noise, Stokes polarization parameter image that existing polarization spectrum imaging technology detects can not achieve noise variance most
Smallization, while rear three Stokes parameters (S1, S2, S3) image noise variance it is also different, therefore can not fair precise quantification
Weight shared by each Stokes polarization parameter.
1996, document [1] reported a kind of panchromatic light-field camera, and the opticator of system contains a primary mirror,
One micro optical array and a set of secondary imaging optical lens.Wherein, micro optical array can be microlens array and either tie up
Array of apertures；If primary mirror aperture stop position carry out optical modulation can be formed different performance fast illuminated polarization and
Optical spectrum imaging device, therefore light field modulation element and technology are to realize polarization spectrum imaging key point.2005, document [2]
It proposes to remove the secondary imaging optical lens in document [1], the panchromatic light field of hand-held is realized merely with primary mirror and lenticule
Image camera has simple and compact advantageous feature.2009, document [3] proposed the primary mirror aperture light in document [2] device
Spectral filtering chip arrays and linear polarization filter array arranged side by side are placed at door screen place, using microaperture arrays obtain linear polarization image with it is more
Spectrum picture；The device cannot obtain the information of circularly polarized light, and polarization image is separated with spectrum picture, cannot obtain
Polarization information related with wavelength.Then, document [4] proposes to change the filter arrays in document [3] device into linear gradient
Spectral filter is to improve spectral resolution.2010, document [5] proposition changed the micropore diameter battle array of document [4] device into micro-
For lens array to improve luminous flux, this is consistent with the method that document [2] uses.2013, document [6] was proposed in document [2]
Linear polarization filter array and linear gradient spectral filter arranged side by side are placed at primary mirror aperture diaphragm in device, obtain separation
Polarization image and high spectrum image.2012, document [7] devised several groups of different spectral filtering chip arrays to improve spectrum
Resolution ratio, and the microaperture arrays in document [3] and [4] are replaced with into microlens array, to improve luminous flux.
2012, Chinese invention patent " a kind of spectrum imaging method and optical spectrum imagers of fast illuminated high throughput " (authorization
Notification number: CN 102944305B) [8] it is also proposed that the microaperture arrays in document [3] and [4] are replaced with microlens array, use
To improve luminous flux, this is consistent with the method for document [5].2013, the Chinese invention patent " imaging side of multispectral light-field camera
Method " (Authorization Notice No.: CN 103234527B) [9] is proposed in a kind of Chinese invention patent " light spectrum image-forming of fast illuminated high throughput
Combination relay lens are introduced behind the device of method and optical spectrum imagers " (Authorization Notice No.: CN 102944305B) [8], it will be micro-
In the back focal plane secondary transferring to detector photosurface of optical array, in favor of arranging detector；But this method can increase
The volume of adding system is unfavorable for minimizing；And the method one that this secondary imaging method and document [1] were reported in 1996
Sample, the innovation of document [2] are that the postposition secondary imaging optics of removal document [1] to realize system compact.2013
Year Chinese invention patent " a kind of the polarization imaging method and polarization imager of fast illuminated high throughput " (Authorization Notice No.: CN
103472592B) [10] propose at primary mirror place four subregions linear polarization filter arrays (0 °, 45 °, 90 °, 135 °), this
Kind method, which is similar to, removes the spectral filter in document [3] and [6], only realizes linear polarization imaging；Chinese invention in 2015
Patent application " a kind of polarization calibrating method of light field polarized imaging system " (application publication number: 105300523 A of CN) [11] and
A kind of Chinese invention patent application " channel of polarization calibrating method of polarization multi-spectrum imaging system " (application publication number: CN
105890761 A) [12], it was recently reported that one kind for calibrate Chinese invention patent " a kind of fast illuminated it is high-throughput polarize image space
The method of method and polarization imager " (Authorization Notice No.: CN 103472592B) [10] reported polarized imaging system.
As can be seen that the fast illuminated polarization of the existing compact based on optical field imaging and optical spectrum imaging device or method, only
Can obtain the information of linearly polarized light, and linearly polarized light image and spectrum picture be separate it is incoherent.2012, Chinese invention
Patent, " high spectrum full polarization detection device is imaged in interference optical field " (Authorization Notice No.: CN102680101 B) [13] and middle promulgated by the State Council
Bright patent, " synchronous Polarization Modulation interference imaging spectral polarization detecting device and method " (application publication number: CN102680101A)
[14], the separation picture point that lenticule back focal plane in document [2] device is received using the lateral shear interferometer of imaging type is proposed,
And the full polarization modulation element of four subregions is placed at the aperture diaphragm of primary mirror, to obtain the spectrum of full Stokes polarization parameter
Image；But the corresponding interference pattern of whole optical path differences could be obtained since lateral shear interferometer needs to scan target, two
The device of a patent of invention report requires to can not achieve fast illuminated using timing acquisition mode and obtain, and system complex, body
Product is larger.
Bibliography
【1】E.H.Adelson and J.Y.A.Wang,“Single lens stereo with a plenoptic
camera,”IEEE Trans.Pattern Anal.Machine Intell.14,99-106(1992).
【2】R.Ng,M.Levoy,M.Bredif,G.Duval,M.Horowitz,and P Hanrahan,“Light
field photography with a handheld plenoptic camera,”Stanford Tech Report CTSR
2005-02(2005).
【3】R.Horstmeyer,G.Euliss,R.Athale,and M.Levoy,“Flexible multimodal
camera using a light field architecture,”International Conference on
Computational Photography(2009).
【4】R.Horstmeyer,R.Athale,G.Euliss,“Modified light field architecture
for reconfigurable multimode imaging,”SPIE Vol.7468,746804(2009).
【5】Z.L.Zhou,Y Yuan,B Xiangli,“Light field imaging spectrometer:
conceptual design and simulated performance,Front.Opt.,FThM3(2010).
【6】B.D.Bartlett,M.D.Rodriguez,“Snapshot Spectral and Polarimetric
Imaging；Target Identification with Multispectral Video,"SPIE Vol.8743,87430R-
1(2013).
【7】K.Berkner,S.A.Shroff,“Design framework for a spectral mask for a
plenoptic camera,”SPIE Vol.8743,87430R-1(2013).
[8] Chinese invention patent, " a kind of spectrum imaging method and optical spectrum imagers of fast illuminated high throughput ", Granted publication
Number: CN 102944305B.
[9] Chinese invention patent, " imaging method of multispectral light-field camera ", Authorization Notice No.: CN 103234527B.
[10] Chinese invention patent, " a kind of the polarization imaging method and polarization imager of fast illuminated high throughput ", authorization are public
Announcement number: CN 103472592B.
[11] Chinese invention patent application, " a kind of polarization calibrating method of light field polarized imaging system ", application publication number:
CN 105300523 A.
[12] Chinese invention patent application, " a kind of channel of polarization calibrating method of polarization multi-spectrum imaging system ", application
Publication number: CN 105890761A.
[13] Chinese invention patent, " high spectrum full polarization detection device is imaged in interference optical field ", Authorization Notice No.:
CN102680101B.
[14] Chinese invention patent, " synchronous Polarization Modulation interference imaging spectral polarization detecting device and method " application are open
Number: CN102680101A.
Summary of the invention
The purpose of the present invention is to provide a kind of fast compact noise immunity type optical field imaging full-polarization spectrum detection dresses of illuminated
It sets and method, using the advantage of light field modulation imaging, compressibility size, later data processing is simple and fast, avoids heavy
Data reconstruction algorithm reduces the Inversion Calculation time, realizes real-time acquisition and the video of the polarization spectrum radiation of two-dimensional space target
Monitoring.
To achieve the goals above, the present invention adopts the following technical scheme:
The fast compact noise immunity type optical field imaging full-polarization spectrum detection device of illuminated, including object lens, light field modulation unit,
Micro optical array, planar array detector and data acquisition process display system；Object lens, light field modulation unit, micro optical array and face
Array detector is along incident light to setting gradually；Light field modulation unit is placed in the aperture diaphragm position of object lens, and micro optical array is placed in
The image planes position of object lens, planar array detector are placed on the back focal plane of micro optical array, and with data acquisition process display system phase
Even；Light field modulation unit includes Polarization Modulation module and spectral filtering chip arrays；Polarization Modulation module includes along incident light direction
The four subregion retardation plates and linear polarizer being sequentially placed；Spectral filtering chip arrays include four subregions, with four subregion retardation plates
Each subregion is corresponding.
Further, four subregion retardation plates include the different achromatism retardation plate of four pieces of retardations placed side by side, each
The angle of polarization direction of fast axis direction and linear polarizer of achromatism retardation plate is different；Each subregion in spectral filtering chip arrays
Filter arrays distribution it is identical, all include multiple and different central wavelengths narrow band filter or linear variable filter.
Further, micro optical array is microlens array, microaperture arrays, low-light fibre array or micro- binary optical battle array
Column.
Further, four subregion retardation plates, linear polarizer and spectral filtering chip arrays are close to successive placement.
The detection method of the compact noise immunity type optical field imaging full-polarization spectrum detection device of fast illuminated, comprising: two dimension is empty
Between any point in target issue light beam and enter object lens, by light field modulation unit carry out polarization with after spectral modulation, shape
The light beam of different polarization and spectroscopic optics information is carried at all directions, then the light beam converges at the micro-optics battle array at object lens image planes
On column, then continue to transmit through micro optical array, forms the separation picture point battle array for carrying different optical information on focal plane behind
Column, data acquisition process display system control the picture point array that one frame of planar array detector snapshot carries different polarization and spectral information
Image, through extracting and processing the frame image data obtain tested two dimension target space pattern, one-dimensional spectrum, full Stokes it is inclined
The information of three aspect of parameter of shaking.
Further, four subregion Polarization Modulations are carried out by Polarization Modulation module first by the light beam of light field modulation unit,
Then the light of each subregion carries out spectral modulation, the emergent ray of last each subregion by the correspondence subregion of spectral filtering chip arrays
With different wavelength and identical Polarization Modulation.
7, detection method according to claim 5, which is characterized in that when the polarization direction of linear polarizer is along level side
The light intensity expression of Xiang Shi, four subregion emergent rays are respectively as follows:
I1(λ)=0.5 [S0+S1(cos2 2θ1+sin2 2θ1cosδ1)+S2(sin2(δ1/2)sin 4θ1)-S3(sin 2θ1sinδ1)],
I2(λ)=0.5 [S0+S1(cos2 2θ2+sin2 2θ2cosδ2)+S2(sin2(δ2/2)sin 4θ2)-S3(sin 2θ2sinδ2)],
I3(λ)=0.5 [S0+S1(cos2 2θ3+sin2 2θ3cosδ3)+S2(sin2(δ3/2)sin 4θ3)-S3(sin 2θ3sinδ3)],
I4(λ)=0.5 [S0+S1(cos2 2θ4+sin2 2θ4cosδ4)+S2(sin2(δ4/2)sin 4θ4)-S3(sin 2θ4sinδ4)],
In formula, λ is wavelength, S0, S1, S2, S3It is four Stokes polarization parameters, (δ1, δ2, δ3, δ4) it is that four subregions prolong respectively
The retardation of each subregion, (θ in slow plate1, θ2, θ3, θ4) be respectively each subregion in four subregion retardation plates fast axis direction and line
The angle of the polarization direction of polarizer (213).
Further, the corresponding separation picture point battle array of lower four pairs of differences (δ, the θ) value of phase co-wavelength planar array detector obtained
Column carry out equation solution, obtain the full Stokes polarization parameter image of target point at that wavelength；Each wavelength is all done similar
Processing, obtains the full Stokes polarization parameter spectrum picture of target point；Separation picture point array corresponding to all target points is all done
Identical processing obtains the full Stokes polarization parameter spectrum picture of two-dimensional space target.
Further, when optical system is influenced by Gaussian noise and photon noise simultaneously or only by photon influence of noise
When, take [δ1=102 °, θ1=72 °], [δ2=102 °, θ2=-72 °], [δ3=142 °, θ4=35 °], [δ4=142 °, θ4=-
35 °] when or each value left and right deviation less than 1 degree when the smallest make an uproar so that all Stokes polarization parameters detected have
Sound variance；When optical system by Gaussian noise by only being influenced, [δ is taken1=132 °, θ1=51.2 °], [δ2=132 °, θ2=-
51.7 °], [δ3=132 °, θ4=15.1 °], [δ4=132 °, θ4=-15.1 °] when or each value left and right deviation less than 1 degree
When, so that all Stokes polarization parameters detected have the smallest noise variance.
Compared with the prior art, the present invention has the following beneficial effects:
1, a frame image of snapshot two-dimensional space target, can be obtained the polarization spectrum information of each target element, retains simultaneously
The spatial information of each target element, temporal resolution is high, and bring influences due to environmental change when avoiding multiple measurement, and two dimension is empty
Between data correlation it is effective, work efficiency is high.
2, light field modulation unit is only set at primary mirror aperture location, not the secondary imaging device of postposition, is had simple
The superiority of compact.
3, data recombination processing is simple lucid and lively, can be monitored in real time to target on a monitor.
4, acquired Stokes polarization parameter has the smallest noise variance, while rear three Stokes parameters (S1, S2,
S3) noise variance with approximate equivalent, be conducive to weight shared by each Stokes polarization parameter of fair precise quantification.
The present invention relative to using timing acquisition mode picture type, push away the type of sweeping or window sweeps type polarization spectrum imaging device
For, without rotation, tuning or step-scan device and related precision positioning device, there is the superior spy obtained real-time, quickly
Sign.Relative to the compression sensing or the fast illuminated polarization spectrum imaging dress of calculating computed tomography type using the heavy algorithm for reconstructing of large amount of complex
For setting, there is the advantageous feature rebuild real-time, quickly.The device of the invention is suitable for detecting dynamic or the fast full light for becoming target
Information can be effectively prevented from the negative effect as brought by the factors such as object variations, jittering noise or environmental change, in astronomy
The fields such as observation, space exploration, earth remote sensing, machine vision and biomedical diagnostic have potential application.
Detailed description of the invention
Fig. 1 is the structural representation of the compact noise immunity type optical field imaging full-polarization spectrum detection device of the fast illuminated of the present invention
Figure.
Fig. 2 is the schematic diagram of the light field modulation unit in Fig. 1.
In figure, 1 be object lens, 2 be light field modulation unit, 3 be micro optical array, 4 be planar array detector, 5 be data acquisition
Display system is handled, 21 be Polarization Modulation module, and 22 be spectral filtering chip arrays, and 211 be four subregion retardation plates, and 213 is inclined for line
Shake device.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Such as Fig. 1, a kind of fast compact noise immunity type optical field imaging full-polarization spectrum detection device of illuminated of the present invention is entered by edge
Light is penetrated to show to the object lens 1, light field modulation unit 2, micro optical array 3, planar array detector 4, data acquisition process set gradually
System 5 forms；Wherein, light field modulation unit 2 is placed in the aperture diaphragm position of object lens 1, and micro optical array 3 is placed in the picture of object lens 1
Face position, planar array detector 4 are placed on the back focal plane of micro optical array 3, and are connected with data acquisition process display system 5；Light
Field modulation unit 2 includes Polarization Modulation module 21 and spectral filtering chip arrays 22；Polarization Modulation module includes along incident light direction
The four subregion retardation plates 211 and linear polarizer 213 being sequentially placed；Spectral filtering chip arrays 22 include four subregions, with four subregions
Each subregion of retardation plate 211 is corresponding；Four subregion retardation plates 211 include that four pieces of different achromatisms of retardation placed side by side prolong
The fast axis direction of slow plate, each achromatism retardation plate is different from the angle of the polarization direction of linear polarizer 213；Spectral filter battle array
The filter arrays distribution of each subregion is identical in column 22, all the narrow band filter comprising multiple and different central wavelengths or linear
Gradual filter；Micro optical array 3 is microlens array or microaperture arrays or low-light fibre array or micro- binary optical
Array；
Such as Fig. 1, object lens 1 are telephotolens, microcobjective or common object lens.
Such as Fig. 1, micro optical array 3 is microlens array, microaperture arrays, low-light fibre array, micro- binary optical array, and
It is placed in the image planes of object lens 1；
Such as Fig. 1, planar array detector 4 is placed on the back focal plane of micro optical array 3, and with data acquisition process display system 5
It is connected；
If the receiving end of Fig. 2, light field modulation unit 2 are four subregion retardation plates 211, exit end is spectral filtering chip arrays
22, it is placed on the aperture diaphragm of object lens 1.
Such as Fig. 2, Polarization Modulation module 21 includes four subregion retardation plates 211 and linear polarizer 213.
Retardation such as Fig. 2, each subregion of four subregion retardation plate 211 is different, the fast axis direction and linear polarization of each subregion
The polarization direction angle of device 213 is different.
The detection method of the compact noise immunity type optical field imaging full-polarization spectrum detection device of the fast illuminated of the present invention are as follows: two dimension
Any point in extraterrestrial target issues light beam and enters object lens 1, carries out polarization and spectral modulation by light field modulation unit 2
Afterwards, the light beam that all directions carry different polarization and spectroscopic optics information is formed, then the light beam converges at micro- at 1 image planes of object lens
On optical array 3, then continue to transmit through micro optical array 3, forms point for carrying different optical information on focal plane behind
From picture point array, data acquisition process display system 5 controls 4 snapshot of planar array detector, one frame and carries different polarization and spectral information
Picture point array image, the space pattern of tested two dimension target, one-dimensional can be obtained by extracting and processing the frame image data
The information of spectrum, three aspect of full Stokes polarization parameter；Wherein by the light beam of light field modulation unit 2 first by Polarization Modulation mould
Block 21 carries out four subregion Polarization Modulations, and then the light of each subregion carries out spectrum tune by the correspondence subregion of spectral filtering chip arrays 22
The emergent ray of system, last each subregion has different wavelength and identical Polarization Modulation；When the polarization side of linear polarizer 213
To in the horizontal direction when, the light intensity expression of four subregion emergent rays is respectively as follows:
I1(λ)=0.5 [S0+S1(cos2 2θ1+sin2 2θ1cosδ1)+S2(sin2(δ1/2)sin 4θ1)-S3(sin 2θ1sinδ1)],
I2(λ)=0.5 [S0+S1(cos2 2θ2+sin2 2θ2cosδ2)+S2(sin2(δ2/2)sin 4θ2)-S3(sin 2θ2sinδ2)],
I3(λ)=0.5 [S0+S1(cos2 2θ3+sin2 2θ3cosδ3)+S2(sin2(δ3/2)sin 4θ3)-S3(sin 2θ3sinδ3)],
I1(λ)=0.5 [S0+S1(cos2 2θ4+sin2 2θ4cosδ4)+S2(sin2(δ4/2)sin 4θ4)-S3(sin 2θ4sinδ4)],
In formula, λ is wavelength, S0, S1, S2, S3It is four Stokes polarization parameters, δ1, δ2, δ3, δ4It is the delay of four subregions respectively
The retardation of each subregion, θ in plate 2111, θ2, θ3, θ4Be respectively in four subregion retardation plates 211 fast axis direction of each subregion with
The angle of the polarization direction of linear polarizer 212；Lower four pairs of differences (δ, the θ) value of phase co-wavelength obtained to planar array detector 4 is corresponding
Separation picture point array carry out simple equation solution, the full Stokes polarization parameter figure of target point at that wavelength can be obtained
Picture；Similar processing is all done to each wavelength, the full Stokes polarization parameter spectrum picture of target point can be obtained；To all targets
The corresponding separation picture point array of point all does identical processing, and the full Stokes polarization parameter spectrum of two-dimensional space target can be obtained
Image.When optical system simultaneously influenced by Gaussian noise and photon noise when or only by photon influence of noise when, take [δ1=
102°,θ1=72 °], [δ2=102 °, θ2=-72 °], [δ3=142 °, θ4=35 °], [δ4=142 °, θ4=-35 °] when or
When each value left and right deviation is less than 1 degree, it may make all Stokes polarization parameters detected that there is the smallest noise variance, together
Shi Housan Stokes parameter (S1, S2, S3) noise variance with approximate equivalent, it is inclined for each Stokes of fair precise quantification
The weight for parameter of shaking.When optical system by Gaussian noise by only being influenced, [δ is taken1=132 °, θ1=51.2 °], [δ2=132 °,
θ2=-51.7 °], [δ3=132 °, θ4=15.1 °], [δ4=132 °, θ4=-15.1 °] when or each value left and right deviation less than 1
When spending, it may make all Stokes polarization parameters detected that there is the smallest noise variance, while rear three Stokes parameters
(S1, S2, S3) noise variance with approximate equivalent, the weight for each Stokes polarization parameter of fair precise quantification.
Claims (6)
1. the fast compact noise immunity type optical field imaging full-polarization spectrum detection device of illuminated, which is characterized in that including object lens (1),
Light field modulation unit (2), micro optical array (3), planar array detector (4) and data acquisition process display system (5)；
Object lens (1), light field modulation unit (2), micro optical array (3) and planar array detector (4) are along incident light to setting gradually；
Light field modulation unit (2) is placed in the aperture diaphragm position of object lens (1), and micro optical array (3) is placed in the image planes position of object lens (1)
It sets, planar array detector (4) is placed on the back focal plane of micro optical array (3), and is connected with data acquisition process display system (5)；
Light field modulation unit (2) includes Polarization Modulation module (21) and spectral filtering chip arrays (22)；Polarization Modulation module includes
The four subregion retardation plates (211) and linear polarizer (213) being sequentially placed along incident light direction；Spectral filtering chip arrays (22) include
Four subregions, it is corresponding with each subregion of four subregion retardation plates (211)；
Four subregion retardation plates (211) include the different achromatism retardation plate of four pieces of retardations placed side by side, and each achromatism prolongs
The fast axis direction of slow plate is different from the angle of polarization direction of linear polarizer (213)；Spectral filtering chip arrays each divide in (22)
The filter arrays distribution in area is identical, all includes the narrow band filter or linear variable filter of multiple and different central wavelengths；
Four subregion retardation plates (211), linear polarizer (213) and spectral filtering chip arrays (22) are close to successive placement；
Micro optical array (3) is microlens array, microaperture arrays, low-light fibre array or micro- binary optical array.
2. the detection side of the compact noise immunity type optical field imaging full-polarization spectrum detection device of fast illuminated described in claim 1
Method characterized by comprising any point in two-dimensional space target issues light beam and enters object lens (1), modulates by light field
Unit (2) carries out polarization and after spectral modulation, forms the light beam that all directions carry different polarization and spectroscopic optics information, then should
Light beam converges on the micro optical array (3) at object lens (1) image planes, then continues to transmit through micro optical array (3), behind
The separation picture point array for carrying different optical information, the detection of data acquisition process display system (5) control plane battle array are formed on focal plane
One frame of device (4) snapshot carries the picture point array image of different polarization and spectral information, by extracting and processing the frame image data
Obtain the information in terms of the space pattern, one-dimensional spectrum, full Stokes polarization parameter three of tested two dimension target.
3. detection method according to claim 2, which is characterized in that by light field modulation unit (2) light beam first by
Polarization Modulation module (21) carries out four subregion Polarization Modulations, and then the light of each subregion is by the correspondence of spectral filtering chip arrays (22)
Subregion carries out spectral modulation, and the emergent ray of last each subregion has different wavelength and identical Polarization Modulation.
4. detection method according to claim 2, which is characterized in that when the polarization direction of linear polarizer (213) is along level
When direction, the light intensity expression of four subregion emergent rays is respectively as follows:
I1(λ)=0.5 [S0+S1(cos22θ1+sin22θ1cosδ1)+S2(sin2(δ1/2)sin4θ1)-S3(sin2θ1sinδ1)],
I2(λ)=0.5 [S0+S1(cos22θ2+sin22θ2cosδ2)+S2(sin2(δ2/2)sin4θ2)-S3(sin2θ2sinδ2)],
I3(λ)=0.5 [S0+S1(cos22θ3+sin22θ3cosδ3)+S2(sin2(δ3/2)sin4θ3)-S3(sin2θ3sinδ3)],
I4(λ)=0.5 [S0+S1(cos22θ4+sin22θ4cosδ4)+S2(sin2(δ4/2)sin4θ4)-S3(sin2θ4sinδ4)],
In formula, λ is wavelength, S0, S1, S2, S3It is four Stokes polarization parameters, (δ1, δ2, δ3, δ4) it is four subregion retardation plates respectively
(211) retardation of each subregion, (θ in1, θ2, θ3, θ4) be respectively each subregion in four subregion retardation plates (211) fast axle side
To the angle of the polarization direction with linear polarizer (213).
5. detection method according to claim 4, which is characterized in that under the phase co-wavelength obtained to planar array detector (4)
The corresponding separation picture point array of four pairs of difference (δ, θ) values carries out equation solution, obtains the full Stokes of target point at that wavelength
Polarization parameter image；Similar processing is all done to each wavelength, obtains the full Stokes polarization parameter spectrum picture of target point；To institute
There is the corresponding separation picture point array of target point all to do identical processing, obtains the full Stokes polarization parameter light of two-dimensional space target
Spectrogram picture.
6. detection method according to claim 4, which is characterized in that when optical system is made an uproar by Gaussian noise and photon simultaneously
Sound shadow ring when or only by photon influence of noise when, take [δ1=102 °, θ1=72 °], [δ2=102 °, θ2=-72 °], [δ3=
142°,θ4=35 °], [δ4=142 °, θ4=-35 °] when or each value left and right deviation less than 1 degree when so that the institute detected
There is Stokes polarization parameter that there is the smallest noise variance；When optical system by Gaussian noise by only being influenced, [δ is taken1=
132°,θ1=51.2 °], [δ2=132 °, θ2=-51.7 °], [δ3=132 °, θ4=15.1 °], [δ4=132 °, θ4=-
15.1 °] when or each value left and right deviation less than 1 degree when so that all Stokes polarization parameters detected have it is the smallest
Noise variance.
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| CN107271039B (en) * | 2017-07-13 | 2019-04-12 | 西安交通大学 | Compact miniature fast illuminated spectral imaging detecting device and detection method |
| CN109655160A (en) * | 2018-03-05 | 2019-04-19 | 曹毓 | A kind of extension target divides visual field polarization measurement system and method in real time |
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