基于局部口径波前探测的大口径太阳望远镜次镜姿态校正方法  

An Alignment Strategy for Secondary Mirror of Large Aperture Solar Telescope Based on Wavefront Detection of Sub-aperture

作　　者：荀辉 张志勇[1,2,3] 白先勇 冯志伟[1,2,4] 王东光 邓元勇[1,2,3] XUN Hui;ZHANG Zhiyong;BAI Xianyong;FENG Zhiwei;WANG Dongguang;DENG Yuanyong(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,P.R.China;University of Chinese Academy of Sciences,Beijing 100049,P.R.China;Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,P.R.China;Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,P.R.China)

机构地区：[1]中国科学院国家天文台,北京100101 [2]中国科学院大学,北京100049 [3]中国科学院太阳活动重点实验室,北京100101 [4]中国科学院天文光学重点实验室,北京100101

出　　处：《影像科学与光化学》2020年第3期377-382,共6页Imaging Science and Photochemistry

基　　金：国家自然科学基金(11973061,11873062,11673038);国家重大科研仪器研制项目〈部门推荐〉(11427901)资助。

摘　　要：为应对大口径天文望远镜因结构弯沉和形变导致的次镜姿态失调、系统像质退化等问题,本文提出了采用小口径平行光源构造人工星点,配合夏克哈特曼波前传感器,利用局部口径波前探测获得局部波像差信息以计算次镜失调量,并结合精密六足位移平台实现次镜姿态实时校正的方法。本文基于目前正在研制中的1 m口径离轴格里高利太阳望远镜实际参数,采用光学软件模拟和数学仿真方法,分析了局部口径的波前探测可行性。仿真结果表明,当选取局部口径直径为200 mm、波前传感器像点质心偏移探测精度达到0.01μm时,即可有效提取波像差信息,以此计算次镜姿态并加以校正,可满足望远镜光学系统像差要求。In order to cope with the problem of secondary mirror misalignment due to structural deflection and deformation of the large aperture telescope and the degradation of the image quality,we came up with a strategy that collimated light is proposed to construct artificial star points,and the Shark Hartman wavefront sensor is used to detect wavefront of sub-aperture.We use local distorted wavefront to calculate the secondary mirror misalignment and combine the precise hexapods to realize the real-time correction.Based on the actual parameters of the 1 m aperture off-axis Gregory solar telescope under development,the optical software simulation and mathematical simulation methods are used to analyze the feasibility of wavefront detection of sub-aperture.The simulation results show that when the local aperture of 200 mm is selected and the detection accuracy of the centroid offset reaches 0.01μm,the wave aberration information can be extracted effectively,so that the telescope meets optical quality after the real-time correction.

关 键 词：大口径太阳望远镜 次镜失调 波前畸变 夏克哈特曼波前传感器 仿真分析 

分 类 号：P111.41[天文地球—天文学]