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利用大孔径积分球辐射光源系统对航空偏振相机的偏振特性进行了实验研究,以各偏振工作波段中0°放置的偏振通道为基准,选取航空偏振相机中心视场64×64像素点计算并校正了各偏振通道中偏振片/滤光片的强度透过率差异;并进一步测量了航空偏振相机光学系统自身的起偏度,通过最小二乘法多项式拟合,给出了各偏振工作波段的偏振度随视场角的拟合函数。该实验的数据图像处理方法具有统计特性,可以消除光学元件部分缺陷及CCD探测器异常响应噪声对拟合偏振度曲线的影响。结果表明,偏振相机不同偏振通道的起偏特性不同,并且随着视场角的增加而变大。
Polarization characteristics of aero-polarimetric camera were experimentally studied by using a large-aperture integrating sphere radiation source system. Taking the 0 ° polarization channel placed in each polarization operating band as a reference, the 64 × 64 pixels in the center of the aero-polarizer camera were selected and corrected The polarizations of the polarizer / filter in each polarization channel were measured. The degree of skewness of the optical system was further measured. The polarizations of the polarizer / Degree Fitting Function with View Angle. The experimental data and image processing method has the statistical characteristics, which can eliminate the partial defects of the optical element and the influence of the abnormal response noise of the CCD detector on the fitted polarization curve. The results show that the polarizer polarization characteristics of the polarization camera are different and increase with the increase of the angle of view.