摘要
采用包含大气湍流内、外尺度的调制折射率谱函数分析了湍流尺度对Fried相干参数(大气相干直径)的影响,给出了Fried参数修正关系。结果表明大气湍流的内尺度对Fried相干参数影响不大,然而由于尺度为L0的大气湍流透镜和相干Fried湍涡的相互作用以及它们对传播光波的衍射作用,有限大气湍流外尺度“增大”了Fried大气相干直径。
Based on the modulation model of the power spectrum of refractive index fluctuation that includes the outer-and inner-scale, the effect of the finite outer-scale of the atmospheric turbulence on Fried coherence parameter is studied and a modified Fried parameter is developed. Results clearly show that atmospheric transverse coherence diameter is increased when the finite outer-scale of the atmospheric turbulence is considered, and the effect of inner-scale on atmospheric transverse coherence diameter can be ignored, because of the action between the atmosphere-turbulence lenses with the diameter (turbulent out-scale) and the Fried coherent lenses with the diameter (Fried parameter).
出处
《红外与激光工程》
EI
CSCD
北大核心
2005年第2期192-194,199,共4页
Infrared and Laser Engineering
基金
教育部重点科学技术资助项目(01091)
关键词
湍流尺度
Fried参数
折射率功率谱
分辨率
Atmospheric turbulence
Coherent light
Optical instrument lenses
Optical resolving power
Refractive index
Spectrum analysis
