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分振幅型全Stokes同时偏振成像系统波片相位延迟误差分析
引用本文:殷玉龙,孙晓兵,宋茂新,陈卫,陈斐楠.分振幅型全Stokes同时偏振成像系统波片相位延迟误差分析[J].物理学报,2019,68(2):24203-024203.
作者姓名:殷玉龙  孙晓兵  宋茂新  陈卫  陈斐楠
作者单位:1. 中国科学院安徽光学精密机械研究所, 合肥 230031; 2. 中国科学技术大学, 合肥 230026; 3. 中国科学院通用光学定标与表征技术重点实验室, 合肥 230031
基金项目:国家重点研发计划(批准号:2016YFE0201400)、卫星应用共性关键技术项目(批准号:30-Y20A010-9007-17/18)、高分重大专项项目(批准号:GFZX04011805)和中国科学院合肥研究院重点项目(批准号:Y73H9P1801)资助的课题.
摘    要:分振幅型全Stokes同时偏振成像仪具有实时性好、空间分辨率高、精度高等优点,有很高的应用价值.分振幅型全Stokes同时偏振成像系统利用偏振分束器、1/2波片和1/4波片将入射光Stokes矢量调制在4幅图像中,可解析入射光Stokes矢量. 1/2波片和1/4波片的相位延迟误差对Stokes矢量测量精度有着不可忽略的影响.建立了包含上述两种误差的Stokes矢量测量误差方程,分析了1/2波片和1/4波片相位延迟耦合误差对自然光、0°/45°线偏光、左旋圆偏光等典型基态入射光的Stokes矢量测量误差的影响,推导了任意偏振态的Stokes矢量测量误差的表征方法.在邦加球球面和球内选取不同偏振度的Stokes矢量作为入射光进行仿真.结果表明, Stokes矢量测量误差和偏振度测量误差均随着入射光偏振度的增大而增大.选取入射光偏振度为1时的偏振测量精度评估系统.为满足2%的偏振测量精度, 1/2波片相位延迟误差应在±1.6°内, 1/4波片相位延迟误差应在±0.5°内.这对提高系统的偏振测量精度具有重要意义,为系统设计和研制提供了重要的理论指导.

关 键 词:偏振成像  波片  相位延迟误差  Stokes矢量
收稿时间:2018-08-18

Phase delay error analysis of wave plate of division-of-amplitude full Stokes simultaneous polarization imaging system
Yin Yu-Long,Sun Xiao-Bing,Song Mao-Xin,Chen Wei,Chen Fei-Nan.Phase delay error analysis of wave plate of division-of-amplitude full Stokes simultaneous polarization imaging system[J].Acta Physica Sinica,2019,68(2):24203-024203.
Authors:Yin Yu-Long  Sun Xiao-Bing  Song Mao-Xin  Chen Wei  Chen Fei-Nan
Institution:1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; 2. University of Science and Technology of China, Hefei 230026, China; 3. Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei 230031, China
Abstract:The division-of-amplitude full Stokes simultaneous polarization imaging system has prominent merits, such as real time, high spatial resolution, high precision, etc. The development of the division-of-amplitude full Stokes simultaneous polarization imaging system has a high application value. The division-of-amplitude full Stokes simultaneous polarization imaging system uses polarization beam splitters, a half wave plate (HWP) and a quarter wave plate (QWP) to modulate the incident Stokes vector into four intensity images. Using the four intensity images, the incident Stokes vector can be analyzed. In the system, the phase delay errors of the HWP and the QWP have a direct influence on the measurement accuracy of the incident Stokes vector. A Stokes vector measurement error equation containing the phase delay errors of the HWP and the QWP is established. When there are the phase delay errors of the HWP and the QWP in the system, the Stokes vector measurement errors of the unpolarized light, 0° liner polarized light, 90° liner polarized light, 45° liner polarized light, 135° liner polarized light, right circularly polarized light and left circularly polarized light are analyzed. A method of solving the Stokes vector measurement error of incident light with any polarization state is given. When the Stokes vectors with different degrees of polarization (DOPs) are used as the incident light, the simulation results show that both the Stokes vector measurement error and the DOP measurement error increase with the DOP of incident light increasing. Therefore, we select the polarization measurement accuracy to evaluate the system when the DOP of incident light equals 1. To ensure that the polarization measurement accuracy of the system is within 2%, the phase delay error of the HWP should be within ±1.6° and the phase delay error of the QWP should be within ±0.5°. The analysis results of the phase delay errors of the HWP and the QWP are of great significance for improving the polarization measurement accuracy of the division-of-amplitude full Stokes simultaneous polarization imaging system, and also provide important theoretical guidance in designing and developing the system.
Keywords:polarization imaging  wave plate  phase delay error  Stokes vector
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