非Kolmogorov湍流情况下低阶校正自适应光学系统的性能分析(英文)

Performance Analysis of Low-Order Correction Adaptive Optical System for Non-Kolmogorov Turbulence

系统地研究了非Kolmogorov湍流情况下低阶校正自适应光学系统的性能.从理论上分析了非Kolmogorov湍流情况下相位扰动的空间特性和时间特性,推导了相位扰动的空间结构函数、时间结构函数以及时间功率谱.基于哈特曼—夏克波前传感器,提出了一些测量大气参数的新方法.引入模式时间校正因子和模式非等晕因子,分析了低阶校正自适应光学系统的波前残余误差,并首次对扩展目标情况时低阶校正自适应光学系统的非等晕误差进行了研究.此外还根据实际采集的太阳表面米粒结构图像。

The performance of low-order correction adaptive optical system for non-Kolmogorov turbulence was studied systematically in this dissertation. The spatial and temporal characterizations of phase fluctuations in non-Kolmogorov turbulence were analyzed theoretically. The spatial structure function, the temporal structure function and the temporal power spectrum of phase fluctuations were derived. Some new methods of measuring the atmospheric parameters with Shack-Hartmann wave-front sensor were proposed. The wavefront residual error of low-order correction adaptive optical system was analyzed by introducing the temporal modal correction coefficient and the modal anisoplanatic coefficient. The anisoplanatic error of low-order correction adaptive optical system with the distributed beacons, to our knowledge, was first investigated. Furthermore, according to the calibrated solar granulation images, the performance of the tip-tilt correction adaptive optical system for the solar granulation was studied by post-processing method.