CN111964782B - Method for detecting specific polarization angle of polaroid by space modulation polarization imaging - Google Patents
Method for detecting specific polarization angle of polaroid by space modulation polarization imaging Download PDFInfo
- Publication number
- CN111964782B CN111964782B CN202010824785.XA CN202010824785A CN111964782B CN 111964782 B CN111964782 B CN 111964782B CN 202010824785 A CN202010824785 A CN 202010824785A CN 111964782 B CN111964782 B CN 111964782B
- Authority
- CN
- China
- Prior art keywords
- polarization
- polarizer
- polarization angle
- frequency domain
- imaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 96
- 238000003384 imaging method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000013598 vector Substances 0.000 claims abstract description 22
- 230000001131 transforming effect Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000001427 coherent effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Images
Classifications
-
- 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
- G01J4/00—Measuring polarisation of light
-
- 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
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Polarising Elements (AREA)
Abstract
The invention provides a method for detecting a specific polarization angle of a polaroid by space modulation polarization imaging. The process comprises the following steps: a1, carrying out spatial modulation polarization imaging on incident light with the central wavelength of lambda to obtain an interference image containing polarization information; a2, transforming the interference image to find out the position where the Stokes vector of the incident light with the central wavelength lambda and narrow bandwidth is modulated in the frequency domain; a3, determining the number and the positions of Stokes vectors in a frequency domain; and A4, judging whether the specific polarization angle of the polarizer has deviation by combining the specific polarization angles of the polarizer, namely 0 degree, 90 degrees and 45 degrees, and the relationship of Stokes vector distribution in a frequency domain, and finally adjusting the polarizer to the correct specific polarization angle. The invention can be used for detecting and adjusting the polarization angle of the polaroid and can be widely applied to the fields of polarization imaging and the like.
Description
(I) technical field
The invention relates to a method for detecting a specific polarization angle of a polarizing film by space modulation polarization imaging, which can be used for detecting and adjusting the polarization angle of the polarizing film and belongs to the technical field of polarization imaging.
(II) background of the invention
Polarization represents the transverse wave characteristic of a light wave, and the light wave can be divided into polarized light and unpolarized light according to the polarization state of the light wave. The polarization state of the light wave can be changed through reflection and refraction, and the polarization is used for representing the physical basic properties of an object. The inherent polarization characteristics of light waves change with the physical properties of matter during their transmission, but they cannot be observed. With the rapid development of the polarization image detection technology, the polarization imaging detection becomes a very meaningful study in emerging directions of polarization information visualization, measurement information dimension expansion, simultaneous detection and the like. The polarization imaging can be roughly divided into a time-sharing type and a snapshot type, wherein the time-sharing type is a method for obtaining a specific polarization image by mechanically rotating a polarizing film to a specific angle or using an electric control liquid crystal for regulation and control, and has the advantages of high spatial resolution, simple subsequent operation and the like. The snapshot type is a method for obtaining all polarization information through one-time imaging and correlation calculation, has good real-time performance and practicability, and the imaging target is also expanded to a dynamic object.
Spatially modulated polarization imaging is advantageous in that it does not degrade the spatial resolution of the imaging nor does it require registration between images to obtain all of the polarization information of the target. The spatial modulation polarization imaging is to obtain several coherent light beams by utilizing the light splitting characteristic of the birefringent crystal, and obtain an interference pattern containing polarization information. After the birefringent wedge prism is applied to polarization imaging, which is proposed by Oka in 2003, the spatial modulation full-polarization imaging technology is used for boarding a stage of polarization imaging, and then Oka and Saito improve the technology and use a Savart plate to replace the birefringent wedge prism, so that the assembly process is simpler and more convenient. In 2008, Haitao Luo developed a principle prototype of Savart-based snapshot imaging SIP, and performed polarization imaging experiments on automobiles and buildings. In 2012, Cao improves the performance of spatial polarization imaging by changing the direction between the optical axes of the single plates in a Savart plate.
The polarizing plate is needed in a specific scene or in some experimental tests, and the error of the polarization angle of the polarizing plate affects the measurement result and causes certain interference to the experimental tests, so the polarization angle of the polarizing plate needs to be measured and adjusted.
The invention discloses a method for detecting a specific polarization angle of a polaroid by space modulation polarization imaging, which comprises the steps of obtaining a corresponding interference pattern by the space modulation polarization imaging, converting the interference pattern, and analyzing the specific polarization angle of the polaroid theory and the distribution condition of polarization components in a frequency domain to judge whether the specific angle of the polaroid is accurate and adjust.
Disclosure of the invention
The invention aims to provide a method for detecting a specific polarization angle of a polaroid by space modulation polarization imaging, which has simple theory and easy operation.
The purpose of the invention is realized by the following technical means:
a method for spatially modulated polarization imaging for polarizer specific polarization angle detection, comprising:
a1, carrying out spatial modulation polarization imaging on incident light with the central wavelength of lambda to obtain an interference image containing polarization information;
a2, transforming the interference image to find the position of Stokes vector modulation of the incident light with narrow bandwidth of central wavelength lambda in the frequency domain;
a3, determining the number and the positions of Stokes vectors in a frequency domain;
and A4, judging whether the specific polarization angle of the polarizer has deviation by combining the specific polarization angles of the polarizer, namely 0 degree, 90 degrees and 45 degrees, and the relationship of Stokes vector distribution in a frequency domain, and finally adjusting the polarizer to the correct specific polarization angle.
Further, the incident light in step a1 is subjected to spatially modulated polarization imaging, and the result of the polarization imaging system is shown in fig. 1, where 1 is a polarizer, 2 is a polarizer set, and 3 is an imaging camera. After entering the polarization imaging system, the incident light is divided into four coherent light beams, and then an interference image containing all polarization information of the target is obtained in the imaging camera.
Further, in the step a4, it is determined whether there is a deviation in the specific polarization angle of the polarizer by combining the specific polarization angles of the polarizer of 0 degree, 90 degrees, and 45 degrees and the Stokes vector distribution in the frequency domain, and finally, the polarizer is adjusted to the correct specific polarization angle. The distribution of the Stokes vectors in the frequency domain is shown in fig. 2, fig. 2(a) is a distribution diagram in the frequency domain at a polarization angle of 0 ° or 90 °, fig. 2(b) is a distribution diagram in the frequency domain at a polarization angle of 45 °, and fig. 2(c) is a distribution diagram in the frequency domain when there is a deviation in a particular polarization angle.
The invention has the beneficial effects that: the invention relates to a method for detecting the specific polarization angle of a polaroid by space modulation polarization imaging.
(IV) description of the drawings
FIG. 1 is composed of a polarizer 1, a polarizer 2 and an imaging camera 3. After incident light passes through the polarizing film 1 and the polarizing lens 2, the light is divided into four coherent beams, and finally an interference image is formed in the imaging camera 3 to obtain an interference image with a specific polarization angle.
Fig. 2 is a distribution diagram of Stokes vectors in different cases in a frequency domain, fig. 2(a) is a distribution diagram in the frequency domain at a polarizing angle of 0 ° or 90 ° of the polarizing plate, fig. 2(b) is a distribution diagram in the frequency domain at a polarizing angle of 45 ° of the polarizing plate, and fig. 2(c) is a distribution diagram in the frequency domain at a non-specific polarizing angle of the polarizing plate or a specific polarizing angle having a deviation.
FIG. 3 is a flow chart of a method for detecting polarizer specific polarization angle by spatially modulated polarization imaging according to the present invention.
(V) detailed description of the preferred embodiments
The invention is further illustrated below with reference to specific examples.
As shown in fig. 3, a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging according to the present invention comprises:
a method for spatially modulated polarization imaging for polarization-specific angle of polarization detection of a polarizer, comprising:
a1, carrying out spatial modulation polarization imaging on incident light with the central wavelength of lambda to obtain an interference image containing polarization information;
a2, transforming the interference image to find the position of Stokes vector modulation of the incident light with narrow bandwidth of central wavelength lambda in the frequency domain;
a3, determining the number and the positions of Stokes vectors in a frequency domain;
and A4, judging whether the specific polarization angle of the polarizer has deviation by combining the specific polarization angles of the polarizer, namely 0 degree, 90 degrees and 45 degrees, and the relationship of Stokes vector distribution in a frequency domain, and finally adjusting the polarizer to the correct specific polarization angle.
Specifically, in the step a4, whether the specific polarization angle of the polarizer has a deviation is determined by combining the specific polarization angles of the polarizer, which are 0 degree, 90 degrees, and 45 degrees, and the Stokes vector distribution in the frequency domain, and finally, the polarizer is adjusted to the correct specific polarization angle. Taking the polarization angle of 0 ° as an example, when the distribution of Stokes vectors in the frequency domain is shown in fig. 2(a), it indicates that the polarization angle of the polarizer is correct at this time and is not adjusted, and when the distribution of Stokes vectors in the frequency domain is shown in fig. 2(c), it indicates that the polarization angle of the polarizer has a certain deviation, and it is necessary to adjust the polarizer so that the distribution of Stokes vectors in the frequency domain is shown in fig. 2(a), the polarization angle adjustment of the polarizer is completed.
Although the present invention has been described in detail with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and structural parts not described in detail in the present invention are all known techniques.
Claims (3)
1. A method for detecting a specific polarization angle of a polaroid by space modulation polarization imaging is characterized by comprising the following steps:
a1, carrying out spatial modulation polarization imaging on incident light with the central wavelength of lambda to obtain an interference image containing polarization information;
a2, transforming the interference image to find the position of Stokes vector modulation of the incident light with narrow bandwidth of central wavelength lambda in the frequency domain;
a3, determining the number and the positions of Stokes vectors in a frequency domain;
and A4, judging whether the specific polarization angle of the polarizer has deviation by combining the specific polarization angles of the polarizer, namely 0 degree, 90 degrees and 45 degrees, and the relationship of Stokes vector distribution in a frequency domain, and finally adjusting the polarizer to the correct specific polarization angle.
2. The method of claim 1 for spatially modulated polarization imaging for polarizer specific polarization angle detection, comprising: by comparing the values of the Stokes vector positions with those of the other Stokes vector positions in determining whether the signal at the modulated position is an interference, it is indicated as an interference when it is too small.
3. The method of claim 1, wherein the method comprises the steps of: when judging whether the specific polarization angle of the polarizer is correct, the distribution of the Stokes vectors of the specific polarization angle in the frequency domain is special, so that the specific polarization angle of the polarizer can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010824785.XA CN111964782B (en) | 2020-08-17 | 2020-08-17 | Method for detecting specific polarization angle of polaroid by space modulation polarization imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010824785.XA CN111964782B (en) | 2020-08-17 | 2020-08-17 | Method for detecting specific polarization angle of polaroid by space modulation polarization imaging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111964782A CN111964782A (en) | 2020-11-20 |
| CN111964782B true CN111964782B (en) | 2022-09-30 |
Family
ID=73389465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010824785.XA Active CN111964782B (en) | 2020-08-17 | 2020-08-17 | Method for detecting specific polarization angle of polaroid by space modulation polarization imaging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111964782B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07119654B2 (en) * | 1992-11-10 | 1995-12-20 | 株式会社モリテックス | Polarization measurement method |
| CN104535188A (en) * | 2014-12-31 | 2015-04-22 | 中国人民解放军63655部队 | Static full-polarization imaging detection system and method for spatial frequency modulation |
| CN107367329B (en) * | 2017-06-22 | 2019-06-11 | 西安交通大学 | A kind of image, spectrum, polarization state integration acquisition device and detection method |
| CN108007574B (en) * | 2017-11-17 | 2019-07-23 | 西安电子科技大学 | The fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type and method |
-
2020
- 2020-08-17 CN CN202010824785.XA patent/CN111964782B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111964782A (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103245285B (en) | A kind of reflection type point diffraction carrier synchronization movable phase interfere pick-up unit and detection method | |
| WO2015101352A1 (en) | Optical polarisation modulation and detection apparatus and detection method | |
| US5555128A (en) | Phase coding technique for one-way image transmission through an aberrating medium | |
| US5587793A (en) | Birefringence distribution measuring method | |
| CN111562223A (en) | Polarizing imaging device and method based on micro-polarizer array | |
| CN111537065A (en) | Bandwidth design method for spatial modulation full-polarization imaging system | |
| CN101113927A (en) | Phase-shifting lateral shearing interferometer | |
| CN114136894B (en) | Error calibration method and device of polarization detection system based on vortex wave plate | |
| CN111964782B (en) | Method for detecting specific polarization angle of polaroid by space modulation polarization imaging | |
| CN103322912B (en) | A kind of reflection type point diffraction is from axle simultaneous phase-shifting interference checking device and detection method | |
| CN111579075B (en) | Fast detection method for light wave polarization state based on Fourier analysis | |
| CN104535190A (en) | Corner shearing type spatial frequency modulation full-polarization imaging detecting device | |
| CN115325933B (en) | Continuous scanning type focusing laser differential interferometer and measuring method | |
| CN114459620B (en) | Device and method for generating pi phase shift between double interference channels through single wave plate | |
| CN114967165A (en) | Wavefront sensing system adopting dual-channel polarization coding and wavefront information decoding method | |
| CN112326203A (en) | Method for determining imaging system parameters through interference fringe central area data | |
| CN113758871A (en) | Polarization component Mueller matrix optimization method based on liquid crystal phase delayer | |
| KR100686923B1 (en) | Phase-shifting Method Using Waveplates in Shearography and System for Measuring Deformation Using The Same | |
| JPS63241305A (en) | Fringe scanning method | |
| CN111982287B (en) | Method for correcting spatial modulation polarization imaging parameters by incident light with tunable bandwidth | |
| CN112326034A (en) | Method for reducing interference on polarization information by adjusting angle of camera | |
| CN112326032A (en) | Method for increasing polarization information based on multiband incident light polarization imaging | |
| US20230116262A1 (en) | Apparatus and method for estimating a phase retarder and method of manufacturing the phase retarder using the same | |
| CN116989896A (en) | Polarization interference imaging device and method for measuring broadband full Stokes parameters | |
| WO1986003014A1 (en) | A mach-zehnder acousto-optic signal processor for electronic support measures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |