基于时变相位屏的非等晕成像数值模型及验证

Numerical Model and Verification of Anisoplanatic Imaging Based on Time-varying Phase Screens

基于多层薄相位屏光传输理论,建立了包含光传输过程、大气分层、相位屏实时连续变化、太阳扩展目标非等晕成像的数值模型,并从相位结构函数、大气相干长度及等晕角等方面进行了分析验证.在H-V 5/7和H-V 10/10两种强弱湍流模型下,大气相干长度及等晕角的绝对误差分别在0.02m和0.3″以内.结果表明,建立的非等晕成像数值模型在时间和空间上的统计特性符合实际应用需求,为研究非等晕误差在太阳稳像及自适应光学系统中的影响提供了可靠的模型支持.

Based on the optical transmission theory of multi-layer phase screens,a numerical model including the optical transmission process,layered atmospheric,continuous predicted phase screens,anisoplanatic imaging of the solar extended target was established,then analyzed and verified from the aspects of phase structure function,atmospheric coherent length and anisoplanatic angle.Under H-V 5/7 and H-V 10/10 turbulence models,the absolute errors of atmospheric coherent length and anisoplanatic angle are within 0.02 mand 0.3″respectively.The results show that the statistical characteristics of the numerical model in time and space meet the practical application requirements,which provides a reliable model for the study of the effect of anisoplanatic errors on the solar image stabilization and adaptive optical system.