CN111964782A - A method for detecting specific polarization angles of polarizers by spatially modulated polarization imaging - Google Patents
A method for detecting specific polarization angles of polarizers by spatially modulated polarization imaging Download PDFInfo
- Publication number
- CN111964782A CN111964782A CN202010824785.XA CN202010824785A CN111964782A CN 111964782 A CN111964782 A CN 111964782A CN 202010824785 A CN202010824785 A CN 202010824785A CN 111964782 A CN111964782 A CN 111964782A
- Authority
- CN
- China
- Prior art keywords
- polarization
- polarizer
- polarization angle
- imaging
- stokes vector
- 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.)
- Granted
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 97
- 238000003384 imaging method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000013598 vector Substances 0.000 claims abstract description 22
- 230000001131 transforming effect Effects 0.000 claims abstract 2
- 238000011895 specific detection Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001427 coherent effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 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
- 238000011160 research Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation 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
本发明提供的是一种空间调制偏振成像对偏振片特定偏振角度检测的方法。其过程包括：A1，对中心波长为λ的入射光进行空间调制偏振成像，得到包含偏振信息的干涉图像；A2，对干涉图像进行变换在频域中找到中心波长λ窄带宽入射光的Stokes矢量被调制的位置；A3，通过分析判断被调制位置上的信号是否是干扰确定Stokes矢量的数量和位置；A4，通过结合偏振片的偏振角度和频域中Stokes矢量是否存在判断偏振片的偏振角度是否正确，最后将偏振片调到正确的偏振角度。本发明可用于偏振片偏振角度的检测调节，可广泛用于偏振成像等领域。
The invention provides a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging. The process includes: A1, performing spatial modulation polarization imaging on the incident light with a central wavelength of λ to obtain an interference image containing polarization information; A2, transforming the interference image to find the Stokes vector of the incident light with a narrow bandwidth of central wavelength λ in the frequency domain The modulated position; A3, determine whether the signal at the modulated position is interference by analyzing and determine the number and position of the Stokes vector; A4, judge the polarization angle of the polarizer by combining the polarization angle of the polarizer and the existence of the Stokes vector in the frequency domain Is it correct, and finally adjust the polarizer to the correct polarization angle. The invention can be used for the detection and adjustment of the polarization angle of the polarizer, and can be widely used in the fields of polarization imaging and the like.
Description
(一)技术领域(1) Technical field
本发明涉及的是一种空间调制偏振成像对偏振片特定偏振角度检测的方法，可用于偏振片偏振角度的检测调节，属于偏振成像技术领域。The invention relates to a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging, which can be used for detection and adjustment of the polarization angle of a polarizer, and belongs to the technical field of polarization imaging.
(二)背景技术(2) Background technology
偏振表示光波的横波特性，根据光波的偏振状态可以将光波分为偏振光和非偏振光。光波通过反射、折射其偏振态会发生变化，偏振用于表示物体的物理等基本属性。光波在其传输过程中，它固有的偏振特性会随物质的物理属性变化而发生改变，但其无法观测。随着偏振图像探测技术的蓬勃发展，偏振信息可视化、测量信息维度扩张、可同时探测等新兴方向已使得偏振成像探测变一件非常有意义的研究。偏振成像大致可以分为分时型和快拍型两大类，其中分时型是通过机械转动偏振片到特定角度或使用电控液晶进行调控得到特定的偏振图像的方法，有空间分辨率高、后续运算简单等优点，缺点是需要多次成像才能计算出所有偏振信息，无法实现实时成像，目标也局限在静态物体。而快拍型是通过一次成像就能通过相关解算得到全部偏振信息的方法，拥有很好的实时性和实用性，成像目标也扩展到动态物体。Polarization represents the transverse wave characteristics of light waves, and light waves can be divided into polarized light and unpolarized light according to the polarization state of light waves. The polarization state of light waves changes through reflection and refraction, and polarization is used to represent the basic properties of objects such as physics. In the process of light wave transmission, its inherent polarization characteristics will change with the physical properties of matter, but it cannot be observed. With the vigorous development of polarization image detection technology, emerging directions such as polarization information visualization, measurement information dimension expansion, and simultaneous detection have made polarization imaging detection a very meaningful research. Polarization imaging can be roughly divided into two categories: time-sharing type and snapshot type. The time-sharing type is a method of obtaining a specific polarization image by mechanically rotating the polarizer to a specific angle or using an electronically controlled liquid crystal to control and control, and has a high spatial resolution. , the follow-up operation is simple and other advantages, the disadvantage is that it takes multiple imaging to calculate all the polarization information, real-time imaging cannot be achieved, and the target is limited to static objects. The snapshot type is a method that can obtain all polarization information through correlation calculation through one imaging, which has good real-time performance and practicability, and the imaging target is also extended to dynamic objects.
空间调制偏振成像很有优势，既不会降低成像的空间分辨率，也不用进行图像间的配准就能得到目标的全部偏振信息。空间调制偏振成像是通过利用双折射晶体的分光特性，得到几束相干的光线，得到一幅包含偏振信息的干涉图。在2003年从Oka提出双折射楔形棱镜应用到偏振成像后，空间调制全偏振成像技术便登上了偏振成像的舞台，而后Oka和Saito又对其进行了改进使用了Savart板替代双折射楔形棱镜，使得装配工艺更加简便。2008年Haitao Luo开发出了基于Savart的快拍成像SIP的原理样机，并对汽车和建筑物进行了偏振成像实验。2012年Cao通过改变Savart板中单板光轴之间的方向，提高了空间偏振成像的性能。Spatially modulated polarization imaging has the advantage of not reducing the spatial resolution of imaging, and obtaining all the polarization information of the target without performing registration between images. Spatially modulated polarization imaging is to obtain several beams of coherent light by using the spectral properties of birefringent crystals to obtain an interferogram containing polarization information. After Oka proposed birefringent wedge prism and applied it to polarization imaging in 2003, spatial modulation full polarization imaging technology has entered the stage of polarization imaging, and then Oka and Saito have improved it and used Savart plate instead of birefringent wedge prism , making the assembly process easier. In 2008, Haitao Luo developed the principle prototype of Savart-based snapshot imaging SIP, and conducted polarization imaging experiments on cars and buildings. In 2012, Cao improved the performance of spatial polarization imaging by changing the direction between the optical axes of the veneers in the Savart plate.
在特定场景或一些实验测试中需要用到偏振片，而偏振片的偏振角度的误差会影响到测量的结果，对实验测试造成一定干扰，所以需要对偏振片的偏振角度进行测量和调节。Polarizers need to be used in specific scenarios or some experimental tests, and the error of the polarization angle of the polarizer will affect the measurement results and cause certain interference to the experimental test, so it is necessary to measure and adjust the polarization angle of the polarizer.
本发明公开了一种空间调制偏振成像对偏振片特定偏振角度检测的方法，是通过空间调制偏振成像，得到相应的干涉图后，经过变换后通过分析偏振片理论的偏振角度和频域中偏振分量的分布情况，判断偏振片特殊角度是否准确并进行调节。The invention discloses a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging. After obtaining a corresponding interferogram through spatially modulated polarization imaging, after transformation, it analyzes the theoretical polarization angle of the polarizer and the polarization in the frequency domain. According to the distribution of the components, determine whether the special angle of the polarizer is accurate and adjust it.
(三)发明内容(3) Contents of the invention
本发明的目的在于提供一种理论简单、操作容易的空间调制偏振成像对偏振片特定偏振角度检测的方法。The purpose of the present invention is to provide a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging with simple theory and easy operation.
本发明的目的是通过以下技术手段实现的：The purpose of this invention is to realize through the following technical means:
一种空间调制偏振成像对偏振片特定偏振角度检测的方法，包括：A method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging, comprising:
A1，对中心波长为λ的入射光进行空间调制偏振成像，得到包含偏振信息的干涉图像；A1, perform spatially modulated polarization imaging on the incident light whose center wavelength is λ to obtain an interference image containing polarization information;
A2，对干涉图像进行变换在频域中找到中心波长λ窄带宽入射光的Stokes矢量被调制的位置；A2, transform the interference image to find the position where the Stokes vector of the incident light with the central wavelength λ and narrow bandwidth is modulated in the frequency domain;
A3，通过分析判断被调制位置上的信号是否是干扰确定Stokes矢量的数量和位置；A3, determine whether the signal at the modulated position is interference to determine the number and position of the Stokes vector through analysis;
A4，通过结合偏振片的偏振角度和频域中Stokes矢量是否存在判断偏振片的偏振角度是否正确，最后将偏振片调到正确的偏振角度。A4. Determine whether the polarization angle of the polarizer is correct by combining the polarization angle of the polarizer and the existence of the Stokes vector in the frequency domain, and finally adjust the polarizer to the correct polarization angle.
进一步，所述步骤A1中所述入射光进行空间调制偏振成像，偏振成像系统的结果如图1所示，1为偏振片，2为偏振镜组，3为成像相机。入射光在进入到偏振成像系统中后会被分成四束相干的光线，然后在成像相机中得到包含目标全部偏振信息的干涉图像。Further, in the step A1, the incident light is subjected to spatial modulation polarization imaging, and the result of the polarization imaging system is shown in FIG. 1 , where 1 is a polarizer, 2 is a polarizer group, and 3 is an imaging camera. After entering the polarization imaging system, the incident light will be divided into four coherent rays, and then an interference image containing all the polarization information of the target will be obtained in the imaging camera.
进一步，所述步骤A4中所述通过结合偏振片的偏振角度和频域中Stokes矢量是否存在判断偏振片的偏振角度是否正确，其中频域中Stokes矢量在不同情况下的分布情况如图2所示，图2(a)为0°或90°偏振角时在频域中的分布图，图2(b)为45°偏振角时在频域中的分布图，图2(c)为特殊偏振角有偏差时在频域中的分布图。Further, in the step A4, it is determined whether the polarization angle of the polarizer is correct by combining the polarization angle of the polarizer and the presence of the Stokes vector in the frequency domain, and the distribution of the Stokes vector in the frequency domain under different conditions is shown in Figure 2. Figure 2(a) is the distribution in the frequency domain when the polarization angle is 0° or 90°, Figure 2(b) is the distribution in the frequency domain when the polarization angle is 45°, and Figure 2(c) is a special The distribution in the frequency domain when the polarization angle is deviated.
本发明的有益效果：本发明是一种空间调制偏振成像对偏振片特定偏振角度检测的方法，与之前的方法相比，通过分析频域之中偏振分量的分布情况进行检测，更加直观具体，理论更加简单明了，对偏振片的偏振角度的调节效果更好。Beneficial effects of the present invention: The present invention is a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging. Compared with the previous method, the detection is performed by analyzing the distribution of polarization components in the frequency domain, which is more intuitive and concrete. The theory is simpler and clearer, and the effect of adjusting the polarization angle of the polarizer is better.
(四)附图说明(4) Description of drawings
图1是由1偏振片，2偏振镜组和3成像相机组成。入射光在经过1偏振片和2偏振镜组后光被分成四束相干的光，最后在3成像相机中形成干涉图像，得到特定偏振角度的干涉图。Figure 1 is composed of 1 polarizer, 2 polarizer groups and 3 imaging cameras. The incident light is divided into four coherent beams after passing through 1 polarizer and 2 polarizer groups, and finally an interference image is formed in the 3 imaging camera to obtain an interferogram with a specific polarization angle.
图2是频域中Stokes矢量在不同情况下的分布图，图2(a)为0°或90°偏振角时在频域中的分布图，图2(b)为45°偏振角时在频域中的分布图，图2(c)为特殊偏振角有偏差时在频域中的分布图。Figure 2 is the distribution diagram of the Stokes vector in the frequency domain under different conditions. Figure 2(a) is the distribution diagram in the frequency domain when the polarization angle is 0° or 90°. The distribution diagram in the frequency domain, Figure 2(c) is the distribution diagram in the frequency domain when the special polarization angle is deviated.
图3是基于空间调制偏振成像对偏振片特定偏振角度检测方法的流程图。FIG. 3 is a flow chart of a method for detecting a specific polarization angle of a polarizer based on spatially modulated polarization imaging.
(五)具体实施方式(5) Specific implementation methods
下面结合具体的实施例来进一步阐述本发明。The present invention will be further described below in conjunction with specific embodiments.
如图3所示，本发明一种空间调制偏振成像对偏振片特定偏振角度检测的方法，包括：As shown in FIG. 3 , a method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging of the present invention includes:
一种空间调制偏振成像对偏振片特定偏振角度检测的方法，包括：A method for detecting a specific polarization angle of a polarizer by spatially modulated polarization imaging, comprising:
A1，对中心波长为λ的入射光进行空间调制偏振成像，得到包含偏振信息的干涉图像；A1, perform spatially modulated polarization imaging on the incident light whose center wavelength is λ to obtain an interference image containing polarization information;
A2，对干涉图像进行变换在频域中找到中心波长λ窄带宽入射光的Stokes矢量被调制的位置；A2, transform the interference image to find the position where the Stokes vector of the incident light with the central wavelength λ and narrow bandwidth is modulated in the frequency domain;
A3，通过分析判断被调制位置上的信号是否是干扰确定Stokes矢量的数量和位置；A3, determine whether the signal at the modulated position is interference to determine the number and position of the Stokes vector through analysis;
A4，通过结合偏振片的偏振角度和频域中Stokes矢量是否存在判断偏振片的偏振角度是否正确，最后将偏振片调到正确的偏振角度。A4. Determine whether the polarization angle of the polarizer is correct by combining the polarization angle of the polarizer and the existence of the Stokes vector in the frequency domain, and finally adjust the polarizer to the correct polarization angle.
具体的，所述步骤A4中所述通过结合偏振片的偏振角度和频域中Stokes矢量是否存在判断偏振片的偏振角度是否正确，以0°偏振角度为例，当频域中的Stokes矢量的分布情况为图2(a)时表示此时偏振片的偏振角度是正确的不用再调节了，当频域中的Stokes矢量的分布情况为图2(c)时表示此时偏振片的偏振角度有一定的偏差，需要对偏振片进行调节，使其频域中的Stokes矢量的分布情况为图2(a)时，偏振片的偏振角度调节完成。Specifically, in the step A4, it is determined whether the polarization angle of the polarizer is correct by combining the polarization angle of the polarizer and the existence of the Stokes vector in the frequency domain. Taking the polarization angle of 0° as an example, when the Stokes vector in the frequency domain is When the distribution is shown in Figure 2(a), it means that the polarization angle of the polarizer is correct at this time, and there is no need to adjust it. When the distribution of the Stokes vector in the frequency domain is shown in Figure 2(c), it means the polarization angle of the polarizer at this time. If there is a certain deviation, the polarizer needs to be adjusted so that the distribution of the Stokes vector in the frequency domain is as shown in Figure 2(a), the polarization angle adjustment of the polarizer is completed.
以上实施例仅用以说明本发明的技术方案而非限制，尽管参照具体的实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。本发明未详细描述的技术、形状、结构部分均为公知技术。The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to specific embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solutions of the present invention, all of them should be included in the scope of the claims of the present invention. The technologies, shapes and structural parts that are not described in detail in the present invention are all known technologies.
Claims (3)
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 true CN111964782A (en) | 2020-11-20 |
| CN111964782B 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) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06147984A (en) * | 1992-11-10 | 1994-05-27 | Moritetsukusu:Kk | Polarized light measuring 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 |
| CN107367329A (en) * | 2017-06-22 | 2017-11-21 | 西安交通大学 | A kind of image, spectrum, polarization state integration acquisition device and detection method |
| CN108007574A (en) * | 2017-11-17 | 2018-05-08 | 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
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06147984A (en) * | 1992-11-10 | 1994-05-27 | Moritetsukusu:Kk | Polarized light measuring 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 |
| CN107367329A (en) * | 2017-06-22 | 2017-11-21 | 西安交通大学 | A kind of image, spectrum, polarization state integration acquisition device and detection method |
| CN108007574A (en) * | 2017-11-17 | 2018-05-08 | 西安电子科技大学 | The fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type and method |
Non-Patent Citations (1)
| Title |
|---|
| 刘震等: "空间调制型全偏振成像系统的角度误差优化", 《红外与激光工程》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111964782B (en) | 2022-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2015101352A1 (en) | Optical polarisation modulation and detection apparatus and detection method | |
| CN102980530B (en) | A kind of elliptical bias detector based on spatial light modulator and measuring method | |
| CN102426058B (en) | A static interference imaging polarimeter and a method for obtaining polarization information of a target | |
| CN111256827B (en) | A light wave polarization state detection method based on vector light field modulation and image processing | |
| CN102829903B (en) | MEMS (Micro Electro Mechanical System) scanning type laser heterodyne interferometer and method thereof in measuring glass stress | |
| CN111562223A (en) | Polarizing imaging device and method based on micro-polarizer array | |
| CN101113927A (en) | phase-shifting transverse shear interferometer | |
| CN103712781A (en) | Device and method for measuring multi-incidence-angle polarization interference in birefringence optical wedge optical axis direction | |
| US11530953B2 (en) | Snapshot Mueller matrix polarimeter | |
| CN111579075B (en) | Fast detection method for light wave polarization state based on Fourier analysis | |
| CN107219191A (en) | A kind of oblique incident ray difference in reflection device based on Fourier transformation | |
| Zhang et al. | Sagnac interferometer based digital shearography for simultaneous dual sensitivity measurement | |
| CN114136894B (en) | Error calibration method and device of polarization detection system based on vortex wave plate | |
| CN105675134B (en) | High spectrum full polarization imaging apparatus and method based on FLC | |
| CN111964782B (en) | Method for detecting specific polarization angle of polaroid by space modulation polarization imaging | |
| CN109187368B (en) | Liquid crystal polarization characteristic real-time detection system and method based on multi-channel measurement | |
| CN117490862A (en) | A phase delay measurement method and device based on convolutional neural network | |
| US11906604B2 (en) | Method for extracting a transverse magneto-optic effect signal | |
| US7075648B2 (en) | Performing retardation measurements | |
| US7233395B2 (en) | Performing retardation measurements | |
| CN116718566A (en) | Plate glass refractive index gradient measuring device based on quantum weak measuring technology | |
| JP2019095249A (en) | Optical analyzer and optical analysis method | |
| CN112326203A (en) | A Method for Determining Imaging System Parameters by Interference Fringe Center Area Data | |
| CN114384047A (en) | Optical fiber refractive index measurement device, method and application based on ellipsometry imaging | |
| CN111982287B (en) | Method for correcting spatial modulation polarization imaging parameters by incident light with tunable bandwidth |
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 |