基于傅里叶变换的强度调制型光谱偏振分析仪

A Intensity Modulated Spectro-Polarimetric Analyzer Based on Fourier Transformation

为了获得更高精度的目标光谱偏振特性,结合现有的标准探测器技术与偏振探测技术原理,研制了一种光谱偏振分析仪。采用连续等角度间隔旋转检偏器对目标信号进行强度调制,通过傅里叶级数算法能够显著降低检偏器定位误差引起的偏振度测量不确定度。利用优化设计的测量主光路和大动态范围线性优良的标准陷阱探测器,保证了偏振度测量精度。利用可更换窄带滤光片实现了光谱偏振度测量。经实验验证,在0.1~0.99偏振度的范围内,光谱偏振分析仪的测量不确定度为0.15%。

For high-precision measurement of target polarization information, a high-precision spectro-polarimetric analyzer is developed, which combines existing high-precision standard detectors technology with polarization detecting theory. By continuous and equiangular rotation of the polarizer, Fourier progression algorithm is used to calculate degree of polarization and it can greatly reduce uncertainty caused by angular error of polarizer. Optimum design of main optical path and fine linear standard trap detector with large dynamic range ensures the measurement precision. A set of alternate narrow-band filters are used to achieve degree of polarization measurement of continuous spectrum. The test results show that the degree of polarization is from 0. 1 to 0. 99, and the measurement uncertainty of spectro-polarimetric analyzer is below 0.15 %.