光学学报, 2015, 35(4): 0412003, 网络出版: 2015-04-01

大动态范围可调线性偏振度参考光源检测与不确定度分析

Test and Uncertainty Analysis of Reference Source with Variable Polarization Degree and Large Dynamic Range
作者单位

1安徽大学物理与材料科学学院, 安徽 合肥 230601

2中国科学院通用光学定标与表征技术重点实验室, 安徽 合肥 230031

3滨州学院物理与电子科学系, 山东 滨州 256603

摘要
介绍了一种新型高精度大动态范围可调线性偏振度参考光源(VPOLS-II),在0.46~2μm 波段内线性偏振度调节范围达到0~0.72.VPOLS-II采用四片平板玻璃起偏的工作原理,辐射光源经过积分球和扩束器准直系统形成具有较高均匀性和平行度的入射光,再经过偏振态调节器输出不同线性偏振度的偏振光.将光谱偏振分析仪实验测量结果与理论计算值进行了比对,分析了VPOLS-II输出线性偏振度不确定度的影响因素.结果表明,线性偏振度范围0~0.72 内,VPOLS-II 的线性偏振度与理论预测值的差异小于6×10-3.在线性偏振度范围0.01~0.09 和0.09~0.72 内,线性偏振度的不确定度分别为8.8%~0.936%和0.936%~0.184%.这种新型参考光源可用于偏振光学遥感器的实验室偏振定标和系统级性能检测.
Abstract
A novel type of high precision reference source with variable polarization degree at large dynamic range(VPOLS-II) is introduced.The degree of linear polarization (DOLP) adjustment range of VPOLS-II varies from 0 to 0.72 within 0.46 mm to 2 mm.VPOLS-II produces linear polarization rays by four parallel glass plates.Through incorporating an integrating sphere and a beam expander system to guarantee the uniformity and parallelism of the outgoing beam,VPOLS-II generates rays with different DOLP through polarization state adjuster.DOLP values of VPOLS-II are tested.The calculated DOLP values of VPOLS-II and the measured ones by the spectropolarimetric analyzer (SPOLA) are compared and the factors influencing the uncertainty of DOLP are analyzed.The results show that the measured DOLP values of VPOLS-II are coincident with the theoretical ones within a 6 × 10-3 maximum difference when DOLP is less than 0.72.The combined uncertainty respectively is 8.8% ~0.936% and 0.936%~ 0.184% within DOLP of 0.01~0.09 and 0.09~0.72.This novel type of reference source meets the requirements polarimetric calibration in laboratory for polarized remote sensors and systematic performance test.
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