GBAII探测地球上空90~100 km气辉MTF研究  

MTF Study of GBAII for Detecting Airglow 90~100 km above the Earth

作　　者：李存霞 刘洋河 李子健 惠宁菊 唐远河[1] LI Cunxia;LIU Yanghe;LI Zijian;XI Ningju;TANG Yuanhe(Department of Physics,School of Science,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学理学院应用物理系,西安710048

出　　处：《光子学报》2022年第3期282-289,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.41975040,61675165);陕西省自然科学基础研究计划(Nos.2020JM-444,2020JZ-46,2021JQ-469)。

摘　　要：分别利用He-Ne激光632.8 nm、O_(2)(0-1)867.7 nm和O(^(1)S)557.7 nm谱线作为光源,研究了地基气辉成像干涉仪的光学传递函数,给出了优化设计、理论计算和实际拍摄图片的MTF值。优化设计MTF的所有值均在0.3以上,部分视场MTF高于0.6;对557.7 nm和867.7 nm波长的气辉,理论计算的MTF分别为0.508和0.510;由室内外实验拍摄获取的GBAII成像干涉图得出的MTF值分别大于0.84、0.58、0.24,与国际著名的星载风成像干涉仪WINDII的0.35 MTF值相当。Ground-Based Airglow Imaging Interferometer(GBAII)is a ground-based wind field detection prototype developed by our research group that integrates the principles of"rotational spectral line temperature measurement"and"four-intensity method".The imaging interferogram of airglow 90~100 km above the earth can be obtained by taking long time exposure of 200 s.Then the information of atmospheric wind speed,temperature and volume emissivity over the Earth can be obtained from the imaging interference fringe.Modulation Transfer Function(MTF)is a very important index in the design,development and testing of ground-based airglow imaging interferometer GBAII,which can characterize the imaging quality of GBAII.In this paper,the modulation transfer function of ground-based airglow imaging interferometer is studied.By using He-Ne laser wavelength of 632.8 nm,O_(2)(0-1)867.7 nm and O(^(1)S)557.7 nm as light sources,the MTF values of the optimized design,theoretical calculation and actual images are given.Firstly,the optical imaging structure of GBAII consists of five parts:a tapered mirror light receiving system,a wide-angle MI phase modulation system,a narrowband interference filter,a CCD and three lenses.The optical structure of GBAII is optimized by Code V,and the point sequence diagram of GBAII was obtained.4×4 was used as a bin,and the diameter of dispersion spot was about 60μm at 0°field of view,and 80~90μm at 2°~9.5°field of view,and the limit resolution was 6.25 lp/mm.For the three airglow lines with wavelength 557.7 nm,630.0 nm and 867.7 nm,all the MTF values are above0.3,and some of the MTF values are higher than 0.6.However,it can also be seen that the MTF meridional branch and sagittal branch differ greatly in the full field of view,mainly caused by astigmatism.Secondly,according to Fourier optical theory,the MTF expression of GBAII optical system is obtained by calculating the MTF of wide-angle Michelson interferometer,interference filter and CCD.The MTF curve of GBAII is given by substituting the MTF expres

关 键 词：地基气辉成像干涉仪 光学传递函数 干涉成像 气辉 光学仪器 

分 类 号：O439[机械工程—光学工程]