Error analysis of the full-Stokes measuring instrument based on aperture division
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摘要: 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 dB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。Abstract: The whole Stokes measurement instrument based on aperture segmentation can obtain all polarization information of the target, but the polarization detector system has an effect on the measurement results. So it is necessary to analyze the measurement error of the Stokes vector[S0,S1,S2,S3]. First, the theory of Stokes vector was researched; next, the working and measuring principle of the full Stokes measuring instrument were introduced; then, the error sources were analyzed; last, the influences of the error sources were simulated. The final simulation results show that, the relative error of polarization and elliptical angle are 1.16% and 4.55% when the phase retardation is 5, the relative error of azimuth angle is 7.68% when the fast axis direction of the wave plate is 2 with respect to the x axis, and the relative error of polarization degree, elliptical angle and azimuth angle is about 1% when the signal-to-noise ratio of CCD detector is 40 dB. The analytical results provide reference for the selection of the component parameters of the experimental device, and support for the full Stokes measuring instrument based on aperture division.
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Key words:
- aperture division /
- Stokes vector /
- polarization detection /
- error analysis
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