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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1.8m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。
Analysis of wavefront fitting ability is an important part of the development of the secondary mirror. It is an important foundation for the development of a new type of adaptive optical system based on the secondary mirror. Taking the fitting error as the evaluation criterion, the Zernike polynomial and Kolmogorov turbulence atmospheric distortions phase plate fitting ability of four alternatives of 1.8m telescope were calculated by using the actuator influence function calculated by finite element method. The results show that the distortion of subunit front 73 is better than that of subunit front 73, the fitting errors of the first 44 Zernike polynomials are all less than 0.5, and that of the distortion of 10000 Kolmogorov turbulence is 0.0541. The wavefront fitting ability under single drive failure conditions at different positions of the secondary mirror was analyzed. It is shown that the failure of the actuator near the aperture of the double-pass filter greatly affects the fitting ability of the secondary mirror before wavefront deformation. Based on the analysis results, the deformable secondary mirror scheme was determined.