光子学报, 2015, 44 (1): 0112001, 网络出版: 2015-01-26
基于功率谱的大口径望远镜面型评价
Large Aperture Telescope Mirror Figure Evaluation with Power Spectral Density
功率谱 波前误差 卡曼模型 大气扰动 大口径望远镜 Power spectral Wave front error: Karman model Atmosphere turbulence Large telescope
摘要
为了更好地评价与研究受视宁影响的观测系统, 引入了基于功率谱的分析方法.使用不同截止频率以及衰减系数的卡曼谱来反演系统的中高频误差, 同时使用Zernike 多项式来表征系统低阶起伏, 结合这两种误差, 得到了系统误差的数值模型.最后, 通过分析实际波前叠加数值模拟大气扰动前后的功率谱, 验证了本方法评价受视宁影响的大口径系统的可行性.
Abstract
The power spectral density was investigated to analyze the seeing-limited performance of large telescope. The Karman spectral with different frequency knees and the Power Spectral Density(PSD) slope were used to simulate the atmosphere turbulence. And the Zernike polynomials was used to analyze the low order deviations. Combining the two kinds of deviation, the numeral modal was built to simulate the system. Lastly, by analyzing the PSD of actual sample and the sample combined with the numeral atmosphere turbulence, the separation of the abberations with different sourse was obtained. The results show that the proposed method can specify the performance of the large telescope under limited seeing.
安其昌, 张景旭, 杨飞, 张丽敏, 刘祥意. 基于功率谱的大口径望远镜面型评价[J]. 光子学报, 2015, 44(1): 0112001. AN Qi-chang, ZHANG Jing-xu, YANG Fei, ZHANG li-min, LIU Xiang-yi. Large Aperture Telescope Mirror Figure Evaluation with Power Spectral Density[J]. ACTA PHOTONICA SINICA, 2015, 44(1): 0112001.
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