空间振幅调制光谱偏振测量技术信息提取研究  

Research on Information Extraction of Spectrum Polarization Measurement Technology Based on Spatial Amplitude Modulation

作　　者：冀海月 李双 向光峰[1,2,3] 骆冬根 韩琳 汪军 洪津 Ji Haiyue;Li Shuang;Xiang Guangfeng;Luo Donggen;Han Lin;Wang Jun;Hong Jin(Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;University of Science and Technology of China,Hefei 230026,Anhui,China;Key Laboratory of Optical Calibration and Characterization,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]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

出　　处：《光学学报》2023年第12期174-183,共10页Acta Optica Sinica

基　　金：国家自然科学基金委员会-中国科学院天文联合基金(U1331111);王宽诚率先人才计划“卢嘉锡国际合作团队项目”(GJTD-2018-15)。

摘　　要：基于空间振幅调制的偏振测量技术,通过由复合光楔和检偏器组成的偏振调制模块将入射光偏振信息调制到空间维,再结合色散模块能够在单次测量中同时获取目标的偏振信息和光谱信息。首先,介绍了系统测量原理,推导出系统调制和解调方程。然后,通过对解调方程的分析,证明了系统具有区分不同偏振态入射光的能力,评估了检偏角对测量结果的不确定度和系统调制效率的影响。最后,给出了系统空间维和光谱维的定标方法,利用系统原理样机进行了偏振测量实验。实验结果表明,系统偏振度测量误差小于0.060,斯托克斯参数Q、U、V的测量误差分别小于0.052、0.035、0.057,测量结果说明了理论分析的正确性。Aerosols are an important part of the global atmosphere and have a great effect on global climate change and human health.Polarization detection technology has important applications in the monitoring of atmospheric aerosols.Traditional polarization measurement instruments use the timesharing measurement method to obtain the polarization information of the target by changing the relative positions of the analyzer and modulator multiple times.It is difficult to accurately determine the polarization information of the target by the timesharing measurement approach when the target to be measured and the instrument are in the state of rapid relative motion.This study reports a polarization measurement method based on spatial amplitude modulation,which modulates the polarization information of the incident light to the spatial dimension through a polarization modulation module composed of a combo wedge and a polarizer.The module is combined with the dispersion module to disperse the incident light,and thus,the polarization information and spectral information of the target can be obtained simultaneously in a single measurement.In addition,the structure is stable without moving parts.Methods Firstly,the measurement principle of the system is introduced,and the modulation and demodulation equations of the system are derived.Then,the system's ability to distinguish incident light with different polarization states is demonstrated through the analysis of the demodulation equation,and the effect of the analyzer angle on the uncertainty of the measurement results is evaluated.After that,the effect of the amount of demodulated data on the overall modulation efficiency of the system is analyzed,and the effect of the analyzer angle on the modulation efficiency of Stokes parameters is evaluated.Finally,the system's calibration method of spatial and spectral dimensions is given,and the polarization measurement experiment is carried out with the system's principle prototype.Results and Discussions The uncertainties of the Stokes

关 键 词：测量 偏振 空间调制 复合光楔 

分 类 号：TH744[机械工程—光学工程]