Comparison of Shack-Hartmann and curvature sensing for large telescopes
Comparison of Shack-Hartmann and curvature sensing for large telescopes
复制标题
大型望远镜的 Shack-Hartmann 和曲率传感的比较
DOI：
10.1117/12.217745
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发表时间：
1995
期刊：
影响因子：
1.9
通讯作者：
A. Doel
中科院分区：
文献类型：
--
作者：
A. Doel
本文报道了48元Shack-Hartmann、20元Shack-Hartmann和20元曲率传感器在闭环天文自适应光学（AO）系统中的性能仿真比较结果。每种情况下所选择的波前重建方法都是基于模态相互作用矩阵技术，并选择泽尼克多项式作为基模。没有尝试在仿真中包含真实的镜像模型，因此对传感技术的评估与特定镜像技术解耦。用不同的导星星等模拟了两种不同的观测条件。在可见光范围内检测波前畸变，在近红外范围内记录校正后的波前点扩展函数。在仿真中还考虑了光子统计和传感器像素读出噪声的影响。
This paper reports the results of a simulation comparing the performance of the following wavefront sensors when used in a closed loop astronomical adaptive optics (AO) system: a 48- element Shack-Hartmann, a 20-element Shack-Hartmann, and a 20-element curvature sensor. The method chosen for wavefront reconstruction in each case is based on a modal interaction matrix technique with zernike polynomials chosen as the basis modes. No attempt is made to include a real mirror model in the simulation, thus the evaluation of the sensing technique is decoupled from specific mirror technologies. Two different seeing conditions are simulated with various guide star magnitudes. The wavefront distortions are sensed in the visible and the point spread function of the corrected wavefront is recorded in the near infra-red. The effects of photon statistics and various levels of sensor pixel readout noise are also included in the simulations.