论文部分内容阅读
基于孔径分割的全斯托克斯测量仪可以获取目标的全部偏振信息,但是偏振探测仪器自身的误差会影响测量结果的准确度,因此需要对测量仪获取斯托克斯矢量[S0,S1,S2,S3]时的测量误差进行分析。首先,研究了偏振光学中斯托克斯矢量相关理论;其次,介绍了基于孔径分割的全斯托克斯测量仪的工作原理和测量原理。然后,分析了测量仪获取斯托克斯矢量时的误差源。最后,仿真分析了该误差源对斯托克斯矢量和目标偏振信息(偏振度、椭率角和方位角)的影响。最终仿真结果表明:波片相位延迟量±5°时,偏振度和椭率角的相对误差为1.16%、4.55%,波片快轴方向相对于x轴的角度为±2°时,方位角的相对误差为7.68%;CCD探测器的噪声信噪比为40 d B时,偏振度、椭率角和方位角的相对误差约为1%。分析结果为实验装置元件参数的选择提供参考依据,为基于孔径分割的全斯托克斯测量仪的优化提供理论支持。
All-Stokes measuring instrument based on aperture segmentation can obtain all the polarization information of the target, but the error of the polarization detecting instrument itself will affect the accuracy of the measurement result. Therefore, it is necessary to obtain the Stokes vector [S0, S1, S2, S3] when the measurement error analysis. Firstly, the theory of Stokes vector in polarized optics is studied. Secondly, the working principle and measuring principle of full Stokes measuring instrument based on aperture segmentation are introduced. Then, the error sources when measuring the Stokes vector are analyzed. Finally, the influence of the error source on the Stokes vector and the target polarization information (polarization degree, ellipticity angle and azimuth) is simulated. The simulation results show that the relative errors of polarizability and elliptic angle are 1.16% and 4.55% when the retardation of the wave plate is ± 5 °, and the azimuth angle is about ± 2 ° with respect to the fast axis of the wave plate. The relative error of polarization, ellipticity and azimuth is about 1% when the SNR of CCD detector is 40 d B. The analysis results provide a reference for the selection of parameters of the experimental device, and provide theoretical support for the optimization of the whole Stokes measuring instrument based on aperture segmentation.