太阳望远镜低时空频率波前像差校正技术  

Low spatio-temporal frequency wavefront aberration correction technology of solar telescope

作　　者：赵思旻 顾乃庭[1,2] 黄林海 肖亚维[1,2] 张兰强 程云涛 杜宗政[2,3] Zhao Simin;Gu Naiting;Huang Linhai;Xiao Yawei;Zhang Lanqiang;Cheng Yuntao;Du Zongzheng(Key Laboratory of Adaptive Optics,Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China;Lightweight Optics and Advanced Materials Technology Center,Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China)

机构地区：[1]中国科学院光电技术研究所自适应光学重点实验室,四川成都610209 [2]中国科学院大学,北京100049 [3]中国科学院光电技术研究所光学轻量化与新材料技术中心,四川成都610209

出　　处：《红外与激光工程》2023年第7期255-266,共12页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(12022308,12073031);国家重点研发计划项目(2021YFC2202200,2021YFC2202201,2021YFC2202204,2021YFC2202004)。

摘　　要：针对大口径太阳望远镜系统运行过程中由于静态位置失配误差、风载弯沉等准静态位置失配误差以及热变形等非失配误差引起的波前像差导致成像质量下降的问题,在对太阳望远镜系统波前像差时空分频的基础上,提出采用次镜刚体位移对太阳望远镜低时空频率波前像差校正的方法,建立起次镜刚体位移与像差校正量的关系,并通过数值仿真及实验验证了采用次镜刚体位移对上述来源像差的校正能力。数值仿真和实验结果表明:次镜刚体位移能够对望远镜系统运行过程中的低时空频率波前像差进行有效校正,其中,对位置失配误差校正后像差RMS值低于原值的9%,对非失配误差校正后像差RMS值低于原值的40%,对多源混合误差校正后像差RMS值低于原值的15%。Objective Solar telescopes are important equipment for conducting solar physics research and predicting space weather.During operation,large aperture solar telescope systems are affected by factors such as optical and mechanical structural deformation caused by solar radiation,gravitational deflection in different directions,windborne optical structural deformation,and environmental temperature changes,resulting in wavefront aberrations,leading to significant degradation in the imaging quality of the solar telescope system,and restricting the resolution of solar atmospheric imaging.Adaptive optical systems are the main means of correcting low spatiotemporal frequency aberrations during the operation of solar telescopes,but their correction of low-order aberrations wastes a large amount of travel and sacrifices their ability to correct high-order aberrations.Therefore,it is necessary to correct the low spatio-temporal frequency aberrations during the operation of the solar telescope without increasing the complexity of the solar telescope system.Methods A simulation system and an experimental system have been established for the 60 cm POST solar telescope system.The sensitivity matrix of the displacement of the secondary mirror rigid body is calculated,and the low spatio-temporal frequency aberration is introduced using a deformable mirror to simulate low-order aberrations.The aberration of the optical system's field of view on the axis is observed using a Hartmann camera.The displacement of the secondary mirror rigid body required for correcting the aberration is calculated using the sensitivity matrix method.Finally,the introduced low spatio-temporal frequency aberration is corrected by adjusting the position of the secondary mirror rigid body.The results of the system fine assembly are shown(Fig.4).Results and Discussions The low spatio-temporal frequency aberrations for simulated solar telescope systems are corrected,the ability of secondary mirror rigid body displacement is quantitatively analyzed to correc

关 键 词：成像系统 像差校正 灵敏度矩阵法 次镜 太阳望远镜 

分 类 号：TH743[机械工程—光学工程]