CN105404014B - A kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution - Google Patents
A kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution Download PDFInfo
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- CN105404014B CN105404014B CN201510990084.2A CN201510990084A CN105404014B CN 105404014 B CN105404014 B CN 105404014B CN 201510990084 A CN201510990084 A CN 201510990084A CN 105404014 B CN105404014 B CN 105404014B
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- 230000010287 polarization Effects 0.000 title claims abstract description 74
- 238000003384 imaging method Methods 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000011514 reflex Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000011159 matrix material Substances 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 239000013598 vector Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0224—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using polarising or depolarising elements
Abstract
The invention discloses a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, including partial polarization Amici prism, high reflective mirror, first phase delayer, second phase delayer and the Wollaston prisms being sequentially placed along incident light direction.All optical elements are contour relative to instrument base planar coaxial；Partial polarization Amici prism passes through 80% p ripples and 20% s ripples, the p ripples and 80% s ripples of reflection 20%；First phase delayer is quarter wave plate, and the angle of fast axle and transmission p light polarization directions is 45 °；Second phase delayer is 1/2 wave plate, and the angle of fast axle and transmission p light polarization directions is 22.5 °.Present system compact conformation is gently small, and single measurement just can obtain the detection full Stokes polarization information image of target, and subgraph arrangement is in matrix pattern, and spatial resolution is high.
Description
Technical field
The invention belongs to light spectrum image-forming detection technology field, and in particular to a kind of full Stokes of high spatial resolution is inclined
Shake modulation imaging beamsplitter.
Technical background
Polarization imaging detection can provide the polarization state image information of detection target scene, can react detection object table
The characteristics such as face shape, roughness and shade, have important application value in fields such as astrosurveillance, military surveillance and remote sensing.
The Stokes vector that polarization information can be constituted with four Stokes polarization parameters is represented.Based on this of Muller matrix computing
Lentor polarized imaging system is one of main polarization imaging method.Usual Stokes polarized imaging system is by Stokes
Polarization Modulation device and imaging system composition, wherein Stokes Polarization Modulation device is core devices.
Traditional polarization imaging method generally uses timesharing Stokes polarization imaging, by obtaining several polarization states successively
Image solves detection target Stokes polarization state information.This method is simple and practical, can obtain high spatial resolution images information,
But in detection time, it is necessary to assure remained stationary between detection target and detector.
To realize real-time detection, some researchers are proposed using point amplitude Stokes polarization imaging and point focal plane
The method of Stokes polarization imaging, wherein traditional point of amplitude Stokes polarized imaging system comprising multiple imaging systems and
Detector, complicated volume is big；Divide focal plane Stokes polarization imaging method to be mainly used in linear polarization detection, such as to carry out
Full Stokes polarization state detection is, it is necessary to make special miniature focal plane polarization arrays, and complex process, cost is higher.
The content of the invention
It is an object of the invention to provide a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, solution
The problem of transient state of having determined full polarization imaging is detected.
The technical solution for realizing the object of the invention is：A kind of full Stokes Polarization Modulation of high spatial resolution into
As beam splitter, it is characterised in that：Including the partial polarization Amici prism, high reflective mirror, the first phase being sequentially placed along incident light direction
Position delayer, second phase delayer and Wollaston prisms；All optical elements are relative to instrument base planar coaxial etc.
It is high；Partial polarization Amici prism passes through 80% p ripples and 20% s ripples, the p ripples and 80% s ripples of reflection 20%；First phase
Delayer is quarter wave plate, and the angle of fast axle and transmission p light polarization directions is 45 °；Second phase delayer is 1/2 wave plate, fast axle
Angle with transmission p light polarization directions is 22.5 °；
The light beam that light source is sent is divided into reflected light and transmitted light through partial polarization Amici prism, and transmitted light is incident to the first phase
Position delayer, is incident to Wollaston prisms, Wollaston prisms are sheared after changing phase through first phase delayer
Separation；Reflected light back reflexes to second phase delayer to high reflective mirror through high reflective mirror, and phase is changed through second phase delayer
After be incident to Wollaston prisms, Wollaston prisms are sheared separation.
The partial polarization Amici prism is shaped as square, and high reflective mirror is shaped as rectangle, partial polarization Amici prism
The angle for reflecting the reflecting surface of light-emitting face and high reflective mirror is θ, wherein 30 °≤θ≤60 °, and θ ≠ 45 °.
The first phase delayer is located on the transmitted light path of partial polarization Amici prism, and second phase delayer is located at
High reflective mirror reflected light path, the emergent light of first phase delayer and the emergent light of second phase delayer, inject Wollaston
Prism.
First phase delayer and second phase the delayer material therefor, size and dimension all same.
Compared with prior art, its remarkable advantage is the present invention：(1) system architecture is compact light small.
(2) single measurement just can obtain the detection full Stokes polarization information image of target.
(3) subgraph arrangement is in matrix pattern, and spatial resolution is high.
Brief description of the drawings
Fig. 1 is the structural representation of the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution of the present invention.
Fig. 2 is placed on the structure chart in Stokes polarized imaging system for the present invention.
Fig. 3 is the subgraph model of the four kinds of polarization states obtained using the present invention, wherein (a) is partial polarization Amici prism
Reflection light-emitting face and high reflective mirror reflecting surface angle theta<Subgraph layout viewing at 45 °；(b) it is partial polarization light splitting rib
The angle theta of the reflection light-emitting face of mirror and the reflecting surface of high reflective mirror>Subgraph layout viewing at 45 °.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
With reference to Fig. 1, a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, including along incident light side
To the partial polarization Amici prism 1 being sequentially placed, high reflective mirror 2, first phase delayer 3, the and of second phase delayer 4
Wollaston prisms 5.All optical elements are contour relative to instrument base planar coaxial；Partial polarization Amici prism 1 is passed through
80% p ripples and 20% s ripples, the p ripples and 80% s ripples of reflection 20%；First phase delayer 3 be quarter wave plate, fast axle with
The angle for transmiting light polarization direction is 45 °；Second phase delayer 4 is 1/2 wave plate, the angle of fast axle and transmission light polarization direction
For 22.5 °.
Further, the partial polarization Amici prism 1 is shaped as square, and high reflective mirror 2 is shaped as rectangle, partial polarization
The angle of the reflection light-emitting face of Amici prism 1 and the reflecting surface of high reflective mirror 2 is θ, wherein 30 °≤θ≤60 °, and θ ≠ 45 °.
Further, the first phase delayer 3 is located on the transmitted light path of partial polarization Amici prism 1, the second phase
Position delayer 4 is located at the reflected light path of high reflective mirror 2, the outgoing of the emergent light and second phase delayer 4 of first phase delayer 3
Light, injects Wollaston prisms 5.
Further, first phase delayer 3 and second phase delayer 4 material therefor, size and dimension are homogeneous
Together.
With reference to Fig. 1, after the beam incoming portion polarization splitting prism 1 that light source is sent pass through 80% p ripples and 20% s
Ripple, the p ripples and 80% s ripples of reflection 20%, 80% p ripples and 20%s ripples enter phase change 90 after first phase delayer 3
Degree enters Wollaston prisms 5, eventually passes rearmounted imaging system and forms the first subgraph 1 and the 3rd subgraph on the detector
As 3；20% p ripples and 80% s ripples reflect in partial polarization Amici prism 1, and being reflected into second phase through high reflective mirror 2 prolongs
After slow device 4, phase change 180 degree enters Wollaston prisms 5, eventually passes rearmounted imaging system and forms the on the detector
Two subgraphs 2 and the 4th subgraph 4.
With reference to Fig. 2, the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution of the present invention is placed on
Between preposition colimated light system and imaging system, imaging system is connected with imaging detector, and four groups of polarization states of synchronous introducing can be achieved
Information.Wherein preposition colimated light system be used for will from detection target light beam be collimated, imaging system be used for will by entirely this
Four beam collimated light beams of the beam splitter modulation of lentor polarization imaging are imaged above the imaging detector at focal plane behind.
With reference to Fig. 3, the image that detector is obtained includes four subgraphs of detection target, and subgraph arrangement is in matrix pattern,
Spatial resolution is high.A kind of polarization state of each subgraph correspondence.Work as θ<At 45 °, subgraph arrangement such as Fig. 3 a；Work as θ>At 45 °,
Subgraph arrangement such as Fig. 3 b.
It is of the invention to be applied to the step of obtaining polarization information in full Stokes polarized imaging system：Will be of the present invention
The full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution be placed on before full Stokes polarized imaging system
Put between colimated light system and imaging system, the light beam that light source is sent is incident to partial polarization light splitting after being collimated through preposition colimated light system
Prism 1, partial polarization Amici prism 1 is through 80% p ripples and 20% s ripples, the p ripples and 80% s ripples of reflection 20%, 80%
P ripples and 20%s ripples enter 90 degree of phase change entrance Wollaston prisms 5 after first phase delayer 3, after eventually passing
Put imaging system and form the first subgraph 1 and the 3rd subgraph 3 on the detector.20% p ripples and 80% s ripples are inclined in part
Shake reflection in Amici prism 1, after being reflected into second phase delayer 4 through high reflective mirror 2, phase change 180 degree enters
Wollaston prisms 5, eventually pass rearmounted imaging system and form the second subgraph 2 and the 4th subgraph 4 on the detector.Most
Four subgraphs can be detected simultaneously on the detector afterwards, i.e., obtain four different polarization state lights of same object point correspondence simultaneously
Strong information, the full Stokes polarization information of target can be detected simultaneously.
Four road light beams are formed after the full Stokes Polarization Modulation imaging beamsplitter that collimated light beam passes through high spatial resolution,
Polarization analysis per road light beam is as follows：
Detector can only detect the first row of four matrixes of the above：
APath1=[0.25 0.15 0-0.2]
APath2=[0.25 0.15 0 0.2]
APath3=[0.25 0.15 0.2 0]
APath4=[0.25 0.15-0.2 0]
Four vectors above are constituted the calculation matrix of one 4 × 4：
The inverse matrix of matrix A is：
The Stokes vector is made to beDetector obtain light intensity be
Then there is AS=I
Therefore, S=A-1·I。
Claims (3)
1. a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, it is characterised in that：Including along incident light
Partial polarization Amici prism (1) that direction is sequentially placed, high reflective mirror (2), first phase delayer (3), second phase delayer
And Wollaston prisms (5) (4)；All optical elements are contour relative to instrument base planar coaxial；Partial polarization Amici prism
(1) the p ripples and 20% s ripples through 80%, the p ripples and 80% s ripples of reflection 20%；First phase delayer (3) is 1/4 ripple
Piece, the angle of fast axle and transmission p light polarization directions is 45 °；Second phase delayer (4) is 1/2 wave plate, fast axle and transmission p light
The angle of polarization direction is 22.5 °；The partial polarization Amici prism (1) is shaped as square, and high reflective mirror (2) is shaped as square
Shape, the angle of the reflection light-emitting face of partial polarization Amici prism (1) and the reflecting surface of high reflective mirror (2) is θ, wherein 30 °≤θ≤
60 °, and θ ≠ 45 °；
The light beam that light source is sent is divided into reflected light and transmitted light through partial polarization Amici prism (1), and transmitted light is incident to the first phase
Position delayer (3), Wollaston prisms (5), Wollaston prisms are incident to after changing phase through first phase delayer (3)
(5) separation is sheared；Reflected light back reflexes to second phase delayer (4) to high reflective mirror (2) through high reflective mirror (2), through
Two phase delayer (4) is incident to Wollaston prisms (5) after changing phase, and Wollaston prisms (5) are sheared separation.
2. the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution according to claim 1, its feature exists
In：The first phase delayer (3) is located on the transmitted light path of partial polarization Amici prism (1), second phase delayer (4)
Positioned at high reflective mirror (2) reflected light path, the emergent light of first phase delayer (3) and the emergent light of second phase delayer (4),
Inject Wollaston prisms (5).
3. the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution according to claim 1, its feature exists
In：The first phase delayer (3) and second phase delayer (4) material therefor, size and dimension all same.
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| CN106019618B (en) * | 2016-08-03 | 2018-10-02 | 南京理工大学 | A kind of synchronous polarization imaging beam splitter |
| CN107228711B (en) * | 2017-07-13 | 2018-09-04 | 西安交通大学 | Compact miniature fast illuminated channel modulation full-polarization spectrum imaging detection device and method |
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| CN104749788A (en) * | 2013-12-25 | 2015-07-01 | 南京理工大学 | Beam splitter for realizing full-Strokes polarization imaging |
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