基于彗差和像点偏移的大口径望远镜次镜姿态校正  

Attitude correction of secondary mirror in large telescope using coma and imaging point position

作　　者：朱熠 王建立[1] 陈涛[1] 吴小霞[1] 李宏壮[1] ZHU Yi;WANG Janli;CHEN Tao;WU Xiaoxia;LI Hongzhuang(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,Changchun 130033,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学精密工程》2022年第23期3090-3096,共7页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.12133009)。

摘　　要：大型望远镜的次镜支撑系统受重力影响,在不同俯仰角状态下会引入不同幅度的姿态误差,导致系统光路偏移,最终影响终端成像设备。如果不进行次镜姿态校正,在望远镜俯仰运动过程中,像点偏移过大,会导致精跟系统超限失效问题,基于望远镜主次镜光学设计参数,利用次镜的曲率中心点和主次镜光路的无彗差点以及次镜六自由度平台,建立了一种次镜姿态校正方法,基于望远镜俯仰角进行次镜姿态校正。通过次镜姿态校正,使望远镜仰角变化时精密跟踪系统前端光路的最大偏移角度由12.85″优化至1.80″。该次镜姿态校正方法易于实现,效果明显,能够满足精密跟踪系统前端的光路粗对准需求,保证高分辨成像系统性能。A secondary mirror mount in a large telescope introduces different attitude errors at different ele⁃vations,reducing the accuracy of the imaging device.In particular,large SiC telescopes suffer from this problem.Without correction of the secondary mirror attitude,a large error of imaging point position was introduced that result in an overload of the precision tracking system.By considering the optical design pa⁃rameters of the telescope,a secondary mirror correction method based on the coma-free point(CFP)and center of curvature was developed.Stewart platform is used to correct the attitude of secondary mirror based on the telescope elevation.The alignment error before the precision tracking system is reduced from 12.85″to 1.80″,as a result of the attitude correction of the secondary mirror.The correction method is simple and effective,allowing for coarse alignment of the precision tracking system and preserving the ac⁃curacy of the imaging system.

关 键 词：主动光学 大型望远镜 次镜 无彗差点 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]