多普勒非对称空间外差干涉仪调制度分析  

The Modulation Efficiency Analysis of Doppler Asymmetric Spatial Heterodyne Spectrometer

作　　者：施海亮[1] 李志伟[1] 罗海燕[1] 熊伟[1] SHI Hailiang;LI Zhiwei;LUO Haiyan;XIONG Wei(Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Key Laboratory of Optical Calibration and Characterization,Hefei 230031,China)

机构地区：[1]中国科学院安徽光学精密机械研究所,中国科学院通用光学定标与表征技术重点实验室,合肥230031

出　　处：《航天返回与遥感》2018年第5期57-65,共9页Spacecraft Recovery & Remote Sensing

基　　金：遥感科学国家重点实验室开放基金(Y7Y00100KZ);国家自然科学基金(41301373)

摘　　要：多普勒非对称空间外差光谱仪是近年得以迅速发展的新型中高层大气风场探测仪器,具有视场展宽、大光通量、高光谱分辨和多谱线同时探测等特点。该仪器的干涉调制度是影响风场反演精度的关键指标。文章基于非对称空间外差光谱技术基本原理,推导了干涉仪视场展宽前后的干涉理论积分公式,分析了干涉调制度与仪器视场角、最优光程差的关系,通过对干涉方程中像元采样积分推导得到干涉调制度与采样间隔的理论形式,仿真了干涉调制度与仪器视场角、最优光程差和采样间隔的定量关系曲线,并通过实验室搭建试验装置对分析结果进行验证。研究结果表明:随着非对称空间外差干涉仪视场角和光程差偏置量的增加,干涉调制度降低;调制度沿着波数增大的方向上升,在同一波数处,随着采样间隔的增加,干涉调制度降低。理论分析和试验测量结果调制度最大偏差0.02,分析与实测结果一致性较好。As a new type of the detection instrument for upper atmospheric wind field,Doppler asymmetric spatial heterodyne spectrometer has been rapidly developed in recent years,with many simultaneous characteristics such as broadening view,large flux,high spectral resolution and multispectral detection ability.The interference modulation efficiency is the key parameter affecting the wind field retrieval precision.Based on the basic principle of asymmetric spatial heterodyne spectroscopy,the integral formula in the interference theory is derived before and after enlarging the view,and the relationship among the interference modulation efficiency,angle of field of view and the optimal optical path difference is analyzed.The theoretical expressions of the interference modulation efficiency and the sampling interval are derived by the pixel sampling integration in the interference equation,and the quantitative relationship curve among the interference modulation efficiency,the angle of field of view and the optimal optical path difference is simulated,and then validated by the laboratory breadboard.The results show that the interference modulation efficiency decreases while increasing the viewing angle and the offset of the optical path difference,and increases with the rise of the wave number or adding the sampling interval at same wave number.The derived modulation has good agreement with the theoretical calculation results,with the maximum error less than 0.02.

关 键 词：多普勒外差干涉仪 调制度 视场角 最优光程差 相位频移 空间大气探测 

分 类 号：O433.4[机械工程—光学工程]