Multi-field Split Curvature Wavefront Sensing and its Application in the Large Field Survey Telescope  

作　　者：Zhixu Wu Yiming Zhang Jianan Cong Hua Bai Yong Xia Rongxin Tang Ming Li Zhengyang Li Xiangyan Yuan 

机构地区：[1]Institute of Space Science and Technology,Nanchang University,Nanchang 330031,China [2]Nanjing Institute of Astronomical Optics&Technology,CAS,Nanjing 210042,China [3]University of Chinese Academy of Sciences,Nanjing,Nanjing 211135,China

出　　处：《Research in Astronomy and Astrophysics》2024年第8期60-74,共15页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(grant No.12173062)。

摘　　要：The image quality of a large field survey telescope with a fast focal ratio of the primary mirror is high sensitivity to the optical elements’misalignments and the primary mirror’s deformations.To maintain good optical performance,the perturbations need to be aligned,and the tomographic reconstruction of these perturbations can be derived from wavefront sensing with multi-field points for alignment.This work undertakes a comprehensive examination related to the implementation and optimization of a multi-field split curvature wavefront sensing system,including defocus distance,signal pre-processing,deblending of overlapped doughnuts,field-dependent correction,and distorted coordinate correction.We also conduct experiments to demonstrate the application and performance of a multi-field split curvature wavefront sensing system in Mephisto.In the context of the decentering of the secondary mirror,the coefficient of determination(R)attains a high value of 0.993,indicating a robust linearity between the coma coefficients and the decentering of the secondary mirror.A comparative analysis of the simulated and experimental results shows that the difference between them is less than 0.1λ.

关 键 词：INSTRUMENTATION high angular resolution-Techniques photometric-Techniques image processing 

分 类 号：P111[天文地球—天文学]