机构地区: 中国科学院光电技术研究所微细加工光学技术国家重点实验室
出 处: 《光电工程》 2007年第3期1-4,9,共5页
摘 要: 本文使用傅立叶变换法对符合Kolmogorov谱的大气随机相位屏进行了数值模拟,采用三层随机相位屏叠加模拟大气湍流。通过比较模拟相位屏的相位结构函数和理论值的符合度对相位屏的统计特性进行了验证,利用长曝光传递函数和相位结构函数计算大气相干长度r0。结果表明,用傅立叶变换法模拟的随机相位屏是正确的,但相位结构函数存在明显的低频空间频率成分不足,采用三层随机相位屏叠加对相位结构函数和理论值的符合度有所改善,实际r0值比设计值偏大。 Numerical simulation of Phase Screen (PS) distorted by atmospheric turbulence following the Kolmogorov spectrum by using Fourier Transform is implemented, In order to simulate turbulence, three PSs are placed together. Accuracy of PS is determined by comparing the phase structure function and theoretical results, and atmospheric coherent length ro is calculated through optical transform function of long exposure and phase structure function. The experimental result shows that the simulated PS with Fourier transform is correct, but low spatial frequency components of PS generated by Fourier Transform significantly deviate from theoretical value. Three PSs put together improve the conformity of phase structure function and theoretical value, the actual ro is bigger than the theoretical value.
关 键 词: 大气湍流 随机相位屏 傅立叶变换法 大气相干长度
领 域: [自动化与计算机技术] [自动化与计算机技术]