摘要
消色差λ/4波片具有一定的二向色性和相位延迟量误差,导致仪器偏振测量产生误差。从考虑全偏振CCD相机自身偏振效应的辐射模型入手,借助积分球辐射源和高精度辅助旋转偏振器,研究系统级非理想消色差λ/4波片的标定方法。结果发现:消色差λ/4波片的二向色性和相位延迟量参数随仪器的工作波长与带宽发生变化,波段650nm(相位延迟量88.90°)和750nm(相位延迟量88.65°)消色差效果相对较好,而波片在波段850nm(相位延迟量84.33°)相位量偏差较大;通过相位延迟量的标准误差分析,得出消色差λ/4波片的系统级标定方法精度优于0.8°。
Polarization measurement error may be caused by achromaticλ/4wave-plate due to the retarder error and different absorption coefficients for the light oscillating along the fast axis and slow axis of wave-plate.We studied the system-level calibration effect of achromaticλ/4wave-plate in full-polarized charge coupled-device(CCD)camera based on the radiometric model by using the integrating sphere and the high-precision auxiliary rotation polarizer.Experimental result shows that there are the variation of the retarder and absorption coefficients of achromaticλ/4wave-plate for the different operating wavelengths and bandwidths in full-polarized CCD camera.The achromatic effects of 650nm(phase retardation 88.90°)and 750nm(phase retardation 88.90°)are better than that of 850nm(phase retardation 84.33°)of our achromaticλ/4wave-plate in full-polarized CCD camera.The phase retardation precision in our system-level calibration is better than 0.8°through the analysis of phase retardation standard error.
出处
《应用光学》
CAS
CSCD
北大核心
2015年第6期905-908,共4页
Journal of Applied Optics
基金
国家自然科学基金(41201368)
山东省高校科研发展计划(J14LJ02)
滨州学院科研基金项目(2013Y09)
关键词
偏振遥感
消色差λ/4波片
偏振器
偏振度
polarization remote sensing
achromaticλ/4wave-plate
polarizer
degree of polarization
