在对三通棱镜同时偏振测量系统进行详细误差分析的基础上，针对主要误差源，提出了相应的标定方法。采用曲线拟合的方法确定了三路通道中偏振片的实际偏振方向，角度标定误差小于0.5°；通过建立不同曝光时间和光圈下的灰度响应校正系数索引表，解决了三路通道灰度响应不一致性问题；运用Harris 角点提取算法，确定了三路通道中偏振图像的像素偏移量及其有效像素范围。标定实验结果表明，系统偏振度测量误差小于5%，偏振角测量误差小于3%。

A calibration method is proposed based on the error analysis of the three links prism simultaneous polarization measurement system. The polarization direction of polarizers is determined by the curve fitting method, which makes the error of the polarization direction for each polarizer less than 0.5 degree. The inconsistency of intensity responses of three channels is solved by establishing and index table of intensity response of different exposure time and aperture. Additionally, we apply Harris corner detector to compute pixel offset and the effective pixel range in the three channels of polarization image. Experimental results show that after the calibration, the measurement error of degree of polarization is less than 5%, and the measurement error of angle of polarization is less than 3％.