大口径主动光学巡天望远镜大动态范围曲率传感  

Large dynamic range curvature sensing for large-aperture active-optics survey telescope

作　　者：安其昌[1] 吴小霞[1] 张景旭[1] 李洪文[1] 王亮[1,2] An Qichang;Wu Xiaoxia;Zhang Jingxu;Li Hongwen;Wang Liang(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;School of Mechanical and Aerospace Engineering,Jilin University,Changchun 130025,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 [2]吉林大学机械与航空航天工程学院,吉林长春130025

出　　处：《红外与激光工程》2021年第10期16-24,共9页Infrared and Laser Engineering

基　　金：中国科学院青年创新促进会(2020221);中国科学院装备研制项目(YJKYYQ20200057);中国科学院大学2020年度大学生创新实践训练计划(2019005770)国家自然科学基金(62005279)。

摘　　要：为了保证外界环境剧烈变化下大口径巡天望远镜的成像质量以及实现系统的快速对准,其波前传感系统在保持像差检测精度的同时也需要具备较大动态范围。首先基于同侧离焦星点像光强分布与曲率传感技术建立了一套大动态范围的对准检测技术,分别使用解析式表达和机器学习方法实现离焦量以及系统其余低阶像差的解算。然后对不同类型像差的解算精度进行了理论分析,最后针对所提出方法进行实验验证,结果表明离焦检测误差(以波前RMS变化为准)分别小于5%,而失调检测误差小于15%,满足对准装调要求。In order to ensure the imaging quality of large-aperture survey telescope under dramatic changes of external environment and realize fast alignment,the wavefront sensing system was required to cover a large dynamic range while maintaining the aberration detection accuracy.First,a set of large dynamic range alignment technology was established based on the light intensity distribution of the single-sided defocus image and curvature sensing.Both analytical formulas and machine learning methods were used to figure out the defocusing and other low-order aberrations.Then,theoretical analysis was made on the resolution accuracy of different types of aberrations.Finally,experimental verification was carried out.The results show that the defocusing detection error(take wavefront RMS variation as the criterion)is less than 5%,while the misalignment detection error is less than 15%,which meets the alignment and adjustment requirements.

关 键 词：大口径巡天望远镜 集成检测 曲率传感 机器学习 

分 类 号：P111.2[天文地球—天文学] O439[机械工程—光学工程]