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空间调制型全偏振成像系统利用Savart偏光镜能够将被探测目标的4个Stokes参数S0~S3调制在同一幅干涉图像中,从而通过单次采集便可获得完整的偏振信息。在该系统中,半波片和检偏器的角度误差对Stokes参数的测量精度有着不可忽略的影响。文中首先给出了包含上述两种角度误差的干涉强度调制方程,根据实际系统参数,在角度误差模型的基础上分析了当入射光为自然光、0°/90°线偏振光、45°/135°线偏振光和左/右旋圆偏振光时,角度误差对空间调制型全偏振成像系统的Stokes参数测量精度的影响。利用这四种基态偏振光的偏振测量误差,给出了任意偏振态和偏振度的入射光偏振测量误差的表征方法 ,最后,文中以系统测量矩阵条件数为优化目标函数,经仿真计算得出当Savart板厚度为23 mm时系统测量矩阵条件取得最小值为2.06,半波片和检偏器耦合角度误差对系统偏振测量精度的影响程度最小。
The space-modulated full-polarization imaging system utilizes the Savart polariscope to modulate the four Stokes parameters S0 ~ S3 of the target to be detected in the same interference image so that the complete polarization information can be obtained by a single acquisition. In this system, the angular errors of the half-wave plate and the analyzer have a non-negligible effect on the measurement accuracy of the Stokes parameter. Firstly, the interference intensity modulation equation including the above two kinds of angular errors is given. Based on the actual system parameters, the incident light is analyzed as natural light, 0 ° / 90 ° linearly polarized light, 45 ° / 135 Angle linearly polarized light and left / right circularly polarized light, the angle error on the Stokes parameter measurement accuracy of the space-modulated full-polarization imaging system. Using the polarization measurement errors of the four kinds of ground-state polarized light, the method of characterizing the measurement error of incident light polarization with arbitrary polarization state and degree of polarization is given. Finally, the article takes the system measurement matrix condition number as the optimization objective function, When the Savart slab thickness is 23 mm, the minimum value of the system measurement matrix condition is 2.06. The influence of the coupling angle error between the half-wave plate and the analyzer on the polarization measurement accuracy of the system is minimal.