基于微扫描的红外偏振成像光学系统研制  

Manufacturing of Infrared Polarization Imaging Optical System Based on Micro-scanning

作　　者：田晨 陈鹏[1,2] 张晓杰 龙华保 侯名洋 沈正祥[1,2] TIAN Chen;CHEN Peng;ZHANG Xiaojie;LONG Huabao;HOU Mingyang;SHEN Zhengxiang(Key Laboratory of Advanced Micro-Structure Materials,Ministry of Education,Tongji University,Shanghai 200092,China;Institute of Precision Optical Engineering,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China;Shanghai Aerospace Control Technology Institute,Shanghai 201109,China;Beijing Institute of Space Mechanics&Electricity,Beijing 100190,China)

机构地区：[1]同济大学先进微结构材料教育部重点实验室,上海200092 [2]同济大学物理科学与工程学院精密光学工程技术研究所,上海200092 [3]上海航天控制技术研究所,上海201109 [4]北京空间机电研究所,北京100190

出　　处：《光子学报》2022年第6期27-37,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11873004,61621001);上海市级科技重大专项(No.2021SHZDZX0100);中央高校基本科研业务费专项。

摘　　要：为了弥补分焦平面偏振成像技术在测量过程存在瞬时视场误差且图像分辨率降低的缺陷,将微扫描技术与分焦平面偏振成像系统相结合,研制了一款基于透镜微扫描的红外偏振成像光学系统,系统波长为3~5μm、F数为2、光学视场角为±2°。采用折反式光学结构,将后透镜组中最后一片透镜作为微扫描透镜,实现了2×2模式的正交位移。完成了公差分析和结构设计,分析了微扫描透镜的同轴度、位置度、扫描位移等对成像质量的影响规律,获得了各视场调制传递函数均高于0.47@17 lp/mm的设计结果。利用研制的系统进行了偏振成像实验,结果表明,红外偏振成像提高了图像的对比度,目标轮廓更清晰,且对不同材质目标的识别能力更强。Division of focal plane polarimeters can obtain transient polarization imaging information,which is a research hotspot in the field of infrared polarization imaging technology.However,there are also some shortcomings.In the measurement process,the instantaneous field of view error will be produced and the image resolution will be reduced.The method of combining micro-scanning technology and infrared polarization imaging technology can make up for the above shortcomings.The focusing lens in the infrared imaging system is used as the micro-scanning lens and fixed on the two-dimensional micro-scanning platform which adopts 2×2 mode to implement periodic scanning.Finally,four sequential images of the same scene with one pixel shift can be obtained,to obtain the target's polarized light intensity data in 4 different directions,and then calculate the Stokes parameters.The polarization imaging optical system based on lens micro-scanning requires that the displacement of the micro-scanning lens does not reduce the imaging quality,that is,the tolerances such as the coaxiality,true position,and scanning displacement of the micro-scanning lens are not sensitive,so higher requirements are proposed for the design and assembly of the optical system.The article first discusses the relevant theoretical basis of polarization based on Stokes vector method,introduces the representation of Stokes vector and the calculation formulas of polarization degree and polarization angle,and then introduces the division of focal plane polarimeters based on micro-scanning technology in detail,including the distance of each displacement,the movement path of the micro-scanning lens.What's more,the infrared imaging system is designed.The catadioptric system is selected as the initial structure,the aspherical secondary mirror is simplified to a plane mirror only for reflecting the light path,and then the aspherical rear lens group is used to correct the aberration.The infrared system has four lenses,and using the last lens as a micro-scanning lens

关 键 词：红外偏振 光学系统 微扫描透镜 折反式 大容差 

分 类 号：O439[机械工程—光学工程]