Study on an active correction algorithm of primary mirror

2017 3rd International Conference on Applied Materials and Manufacturing Technology

Dai, Xiaolin^1,2,3 ; Xian, Hao^1,2 ; Zhang, Xuejun^1,2 ; Zhang, Yudong^1,2

Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, 1 Xiahanggang Ave., Chengdu, China^1

Institute of Optics and Electronics, Chinese Academy of Sciences, 1 Xihanggang Ave., Chengdu, China^2

University of Chinese Academy of Sciences, Beijing, China^3

关键词: Active correction;    Fitting error;    Fixed points;    Modified algorithms;    Primary mirrors;    Thin mirrors;    Zernike aberrations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/242/1/012086/pdf
DOI  :  10.1088/1757-899X/242/1/012086

来源: IOP

【 摘 要 】

The effects of active correction for the telescopes' primary mirrors are often degraded because the axial fixed points of the primary mirrors usually aren't able to perform active correction. This paper analyzes this problem and proposes a modified active correction algorithm to eliminate the adverse influence of the axial fixed points. We use a 1.2m thin mirror to simulate the modified algorithm, it shows the modified algorithm can significantly eliminate the adverse influence of the fixed points and improve the mirror's active correction effect: the fitting error of the 1.2m thin mirror on the 5th Zernike aberration reduces from 13nm to 1.6nm, the fitting errors for other Zernike aberrations also significantly reduce.