CN105404014A - Full Stokes polarization modulation imaging beam splitter with high spatial resolution - Google Patents
Full Stokes polarization modulation imaging beam splitter with high spatial resolution Download PDFInfo
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- CN105404014A CN105404014A CN201510990084.2A CN201510990084A CN105404014A CN 105404014 A CN105404014 A CN 105404014A CN 201510990084 A CN201510990084 A CN 201510990084A CN 105404014 A CN105404014 A CN 105404014A
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- 230000010287 polarization Effects 0.000 title claims abstract description 78
- 238000003384 imaging method Methods 0.000 title claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 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
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000001615 p wave Methods 0.000 abstract 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 14
- 239000011159 matrix material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 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
- 238000011897 real-time detection Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static 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
-
- 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 full Stokes polarization modulation imaging beam splitter with high spatial resolution. The splitter comprises a partial polarization splitting prism, a high reflector mirror, a first phase delay, a second phase delay and a Wollaston prism, which are successively arranged in the direction of incident light. An optical element and the plane of an apparatus pedestal are coaxial and equal in height. 80% of p waves and 20% of s waves penetrate through the partial polarization splitting prism. 20% of p waves and 80% of s waves are reflected by the partial polarization splitting prism. The first phase delay is of 1/4 wave plate. The included angle between a fast axis and the p light polarization direction is 45 DEG. The second phase delay is of a 1/2 wave plate. The included angle between the fast axis ad the transmission p light polarization direction is 22.5 DEG. The splitter is compact in structure, small in size and light in weight. The targeted full Stokes polarization information image can be detected easily via the measurement at a time. Sub-images are arranged in a Chinese character Tian-shaped manner and spatial resolution is high.
Description
Technical field
The invention belongs to light spectrum image-forming Detection Techniques field, be specifically related to a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution.
Technical background
Polarization imaging detection can provide the polarization state image information of detection of a target scene, can react the characteristics such as detection target surface shape, roughness and shade, have important using value in fields such as astrosurveillance, military surveillance and remote sensing.Polarization information can represent by the Stokes vector of four Stokes polarization parameter compositions.Stokes polarized imaging system based on Muller matrix computing is one of main polarization imaging method.Usual Stokes polarized imaging system is made up of Stokes Polarization Modulation device and imaging system, and wherein Stokes Polarization Modulation device is core devices.
Traditional polarization imaging method adopts timesharing Stokes polarization imaging usually, solves detection of a target Stokes polarization state information by obtaining several polarization state images successively.The method is simple and practical, can obtain high spatial resolution images information, but in detection time, must ensure to keep between the detection of a target and detector maintaining static.
For realizing real-time detection, some researchers propose the method adopting point amplitude Stokes polarization imaging and point focal plane Stokes polarization imaging, a wherein traditional point amplitude Stokes polarized imaging system comprises multiple imaging system and detector, and complex structure volume is large; Divide focal plane Stokes polarization imaging method to be mainly used in linear polarization detection, as carried out the detection of full Stokes polarization state, need to make special miniature focal plane polarization arrays, complex process, cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, solve the problem of transient state full polarization imaging detection.
The technical solution realizing the object of the invention is: a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, is characterized in that: comprise partial polarization Amici prism, high reflective mirror, first phase delayer, second phase delayer and the Wollaston prism placed successively along incident light direction; All optical elements are contour relative to instrument base planar coaxial; Partial polarization Amici prism, through the p ripple of 80% and the s ripple of 20%, reflects the p ripple of 20% and the s ripple of 80%; First phase delayer is quarter wave plate, and the angle of fast axle and transmission p light polarization direction is 45 °; Second phase delayer is 1/2 wave plate, and the angle of fast axle and transmission p light polarization direction is 22.5 °;
The light beam that light source sends is divided into reflected light and transmitted light through partial polarization Amici prism, and transmitted light is incident to first phase delayer, and change after phase place through first phase delayer and be incident to Wollaston prism, Wollaston prism is sheared separation; Reflected light back, to high reflective mirror, reflexes to second phase delayer through high reflective mirror, and change after phase place through second phase delayer and be incident to Wollaston prism, Wollaston prism is sheared separation.
Described partial polarization Amici prism shape is square, and high reflective mirror shape is rectangle, and the angle of the reflected light exit facet of partial polarization Amici prism and the reflecting surface of high reflective mirror is θ, wherein 30 °≤θ≤60 °, and θ ≠ 45 °.
Described first phase delayer is positioned on the transmitted light path of partial polarization Amici prism, and second phase delayer is positioned at high reflective mirror reflected light path, and the emergent light of first phase delayer and the emergent light of second phase delayer, all inject Wollaston prism.
Described first phase delayer and second phase delayer material therefor, size and dimension are all identical.
Compared with prior art, its remarkable advantage is in the present invention: (1) system architecture is compact gently little.
(2) single measurement just can obtain the detection of a target full Stokes polarization information image.
(3) subimage arrangement is in matrix pattern, and spatial resolution is high.
Accompanying drawing explanation
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 the structural drawing that the present invention is placed in Stokes polarized imaging system.
Fig. 3 is the subimage model of four kinds of polarization states that application the present invention obtains, the subimage layout viewing during angle theta <45 ° of the wherein reflecting surface of (a) the reflected light exit facet that is partial polarization Amici prism and high reflective mirror; Subimage layout viewing during the angle theta >45 ° of b reflected light exit facet that () is partial polarization Amici prism and the reflecting surface of high reflective mirror.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Composition graphs 1, a kind of full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, comprises partial polarization Amici prism 1, high reflective mirror 2, first phase delayer 3, second phase delayer 4 and the Wollaston prism 5 placed successively along incident light direction.All optical elements are contour relative to instrument base planar coaxial; Partial polarization Amici prism 1, through the p ripple of 80% and the s ripple of 20%, reflects the p ripple of 20% and the s ripple of 80%; First phase delayer 3 is quarter wave plate, and the angle of fast axle and transmitted light polarization direction is 45 °; Second phase delayer 4 is 1/2 wave plate, and the angle of fast axle and transmitted light polarization direction is 22.5 °.
Further, described partial polarization Amici prism 1 shape is square, and high reflective mirror 2 shape is rectangle, and the angle of the reflected light exit facet of partial polarization Amici prism 1 and the reflecting surface of high reflective mirror 2 is θ, wherein 30 °≤θ≤60 °, and θ ≠ 45 °.
Further, described first phase delayer 3 is positioned on the transmitted light path of partial polarization Amici prism 1, second phase delayer 4 is positioned at high reflective mirror 2 reflected light path, and the emergent light of first phase delayer 3 and the emergent light of second phase delayer 4, all inject Wollaston prism 5.
Further, described first phase delayer 3 and second phase delayer 4 material therefor, size and dimension are all identical.
Composition graphs 1, through the p ripple of 80% and the s ripple of 20% after the beam incoming portion polarization splitting prism 1 that light source sends, the reflection p ripple of 20% and the s ripple of 80%, after the p ripple of 80% and 20%s ripple enter first phase delayer 3, phase change 90 degree enters Wollaston prism 5, eventually passes rearmounted imaging system and forms the first subimage 1 and the 3rd subimage 3 on the detector; The p ripple of 20% and the s ripple of 80% reflect in partial polarization Amici prism 1, after high reflective mirror 2 reflection enters second phase delayer 4, phase change 180 degree enters Wollaston prism 5, eventually passes rearmounted imaging system and forms the second subimage 2 and the 4th subimage 4 on the detector.
Composition graphs 2, the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution of the present invention is placed between preposition colimated light system and imaging system, and imaging system is connected with imaging detector, can realize synchronously introducing four groups of polarization state information.Wherein preposition colimated light system is used for the light beam from the detection of a target to collimate, and imaging system is used for restrainting parallel beams by modulate through the beam splitter of full Stokes polarization imaging four and is imaged on above the imaging detector at its back focal plane place.
Composition graphs 3, the image that detector obtains comprises four subimages of the detection of a target, and subimage arrangement is in matrix pattern, and spatial resolution is high.The corresponding a kind of polarization state of each subimage.As θ <45 °, subimage arrangement is as Fig. 3 a; As θ >45 °, subimage arrangement is as Fig. 3 b.
The present invention is applied to the step obtaining polarization information in full Stokes polarized imaging system: between the preposition colimated light system that the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution of the present invention is placed on full Stokes polarized imaging system and imaging system, the light beam that light source sends is incident to partial polarization Amici prism 1 after preposition colimated light system collimation, partial polarization Amici prism 1 is through the p ripple of 80% and the s ripple of 20%, the reflection p ripple of 20% and the s ripple of 80%, after the p ripple of 80% and 20%s ripple enter first phase delayer 3, phase change 90 degree enters Wollaston prism 5, eventually pass rearmounted imaging system and form the first subimage 1 and the 3rd subimage 3 on the detector.The p ripple of 20% and the s ripple of 80% reflect in partial polarization Amici prism 1, after high reflective mirror 2 reflection enters second phase delayer 4, phase change 180 degree enters Wollaston prism 5, eventually passes rearmounted imaging system and forms the second subimage 2 and the 4th subimage 4 on the detector.Finally can detect four subimages on the detector simultaneously, namely obtain corresponding four the different polarization state intensity signals of same object point simultaneously, can the full Stokes polarization information of the detection of a target simultaneously.
Collimated light beam is by forming four road light beams after the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution, and the polarization analysis of every road light beam is as follows:
Detector can only detect the first row of above four matrixes:
A
Path1＝[0.250.150-0.2]
A
Path2＝[0.250.1500.2]
A
Path3＝[0.250.150.20]
A
Path4＝[0.250.15-0.20]
Four vectors are above formed the calculation matrix of 4 × 4:
The inverse matrix of matrix A is:
Stokes vector is made to be
The light intensity that detector obtains is
Then there is AS=I
Therefore, S=A
-1i.
Claims (4)
1. a full Stokes Polarization Modulation imaging beamsplitter for high spatial resolution, is characterized in that: comprise partial polarization Amici prism (1), high reflective mirror (2), first phase delayer (3), second phase delayer (4) and the Wollaston prism (5) placed successively along incident light direction; All optical elements are contour relative to instrument base planar coaxial; Partial polarization Amici prism (1), through the p ripple of 80% and the s ripple of 20%, reflects the p ripple of 20% and the s ripple of 80%; First phase delayer (3) is quarter wave plate, and the angle of fast axle and transmission p light polarization direction is 45 °; Second phase delayer (4) is 1/2 wave plate, and the angle of fast axle and transmission p light polarization direction is 22.5 °;
The light beam that light source sends is divided into reflected light and transmitted light through partial polarization Amici prism (1), transmitted light is incident to first phase delayer (3), change after phase place through first phase delayer (3) and be incident to Wollaston prism (5), Wollaston prism (5) is sheared separation; Reflected light back is to high reflective mirror (2), second phase delayer (4) is reflexed to through high reflective mirror (2), change after phase place through second phase delayer (4) and be incident to Wollaston prism (5), Wollaston prism (5) is sheared separation.
2. the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution according to claim 1, it is characterized in that: described partial polarization Amici prism (1) shape is square, high reflective mirror (2) shape is rectangle, the angle of the reflected light exit facet of partial polarization Amici prism (1) and the reflecting surface of high reflective mirror (2) is θ, wherein 30 °≤θ≤60 °, and θ ≠ 45 °.
3. the full Stokes Polarization Modulation imaging beamsplitter of high spatial resolution according to claim 1, it is characterized in that: described first phase delayer (3) is positioned on the transmitted light path of partial polarization Amici prism (1), second phase delayer (4) is 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), all inject Wollaston prism (5).
4. the full Stokes Polarization Modulation imaging beamsplitter of the high spatial resolution according to claim 1 or 3, is characterized in that: described first phase delayer (3) and second phase delayer (4) material therefor, size and dimension are all identical.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019618A (en) * | 2016-08-03 | 2016-10-12 | 南京理工大学 | Synchronous polarization imaging beam splitter |
| CN107228711A (en) * | 2017-07-13 | 2017-10-03 | 西安交通大学 | Compact miniature fast illuminated channel modulation full-polarization spectrum imaging detection device and method |
| CN110261319A (en) * | 2019-06-24 | 2019-09-20 | 西安理工大学 | The device and measurement method of Mueller matrix spectrum are measured based on four times |
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| CN104748854A (en) * | 2013-12-25 | 2015-07-01 | 南京理工大学 | Full-Stokes interference imaging spectral device and method based on time-sharing polarization modulation |
| 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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Patent Citations (2)
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| CN104748854A (en) * | 2013-12-25 | 2015-07-01 | 南京理工大学 | Full-Stokes interference imaging spectral device and method based on time-sharing polarization modulation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019618A (en) * | 2016-08-03 | 2016-10-12 | 南京理工大学 | Synchronous polarization imaging beam splitter |
| CN107228711A (en) * | 2017-07-13 | 2017-10-03 | 西安交通大学 | Compact miniature fast illuminated channel modulation full-polarization spectrum imaging detection device and method |
| 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 |
| CN110261319A (en) * | 2019-06-24 | 2019-09-20 | 西安理工大学 | The device and measurement method of Mueller matrix spectrum are measured based on four times |
| CN110261319B (en) * | 2019-06-24 | 2021-11-16 | 西安理工大学 | Device and method for measuring Mueller matrix spectrum based on four times |
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