光学学报, 2011, 31 (8): 0822002, 网络出版: 2011-07-29
1.8 m望远镜变形次镜波前拟合能力分析 下载: 511次
Wave-Front Fitting Capability Analysis of 1.8 m Telescope′s Adaptive Secondary Mirror
自适应光学 望远镜 大气湍流校正 变形次镜 有限元分析 波前拟合能力分析 adaptive optics telescope atmospheric-furbulence correction adaptive secondary mirror finite element analysis wave-front fitting capability analysis
摘要
波前拟合能力分析是变形次镜研制工作的重要组成部分,是基于变形次镜的新型自适应光学系统研制的重要基础。以拟合误差为评价标准,采用有限元计算所得驱动器影响函数对1.8 m望远镜变形次镜四个备选方案进行了泽尼克(Zernike)多项式、Kolmogorov湍流大气畸变相位屏拟合能力分析.结果表明73单元变形次镜波前拟合能力较强,对前44项Zernike多项式拟合误差均小于0.5,对10000幅Kolmogorov湍流大气畸变相位屏拟合误差均值为0.0541。分析了变形次镜不同位置单个驱动失效条件下的波前拟合能力,表明靠近通光口径边缘驱动器失效对变形次镜波前拟合能力影响较大。基于分析结果,确定了变形次镜方案。
Abstract
Wave-front fitting capability analysis is an important part of adaptive secondary mirror′s design. Fitting capability simulation of 1.8 m telescope′s adaptive secondary mirror based on finite element analysis (FEA) influence function is presented. Analysis results show that the 73-element adaptive secondary mirrors can fit the 44-term Zernike polynomials with lower fitting errors. Mean fitting errors of 10000 frames of Kolmogorov phase screens is about 0.0541. Invalidated actuators near pupil edge induce fitting capability to reduce fearfully. Since the 73-element adaptive secondary mirror has better fitting ability with an actuator broken, the scheme has been chosen as 1.8 m telescope′s adaptive secondary mirror.
樊新龙, 官春林, 饶长辉. 1.8 m望远镜变形次镜波前拟合能力分析[J]. 光学学报, 2011, 31(8): 0822002. Fan Xinlong, Guan Chunlin, Rao Changhui. Wave-Front Fitting Capability Analysis of 1.8 m Telescope′s Adaptive Secondary Mirror[J]. Acta Optica Sinica, 2011, 31(8): 0822002.