红外与激光工程, 2005, 34 (2): 192, 网络出版: 2006-05-25
有限湍流尺度对红外大气成像系统分辨率的影响
Effect of finite turbulence-scale on the resolutions of infrared imaging system in atmosphere
湍流尺度 Fried参数 折射率功率谱 分辨率 Turbulence-scale Fried parameter Power spectrum of refractive index fluctuation Resolutions
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.
Abstract
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.
张逸新, 陶纯堪. 有限湍流尺度对红外大气成像系统分辨率的影响[J]. 红外与激光工程, 2005, 34(2): 192. 张逸新, 陶纯堪. Effect of finite turbulence-scale on the resolutions of infrared imaging system in atmosphere[J]. Infrared and Laser Engineering, 2005, 34(2): 192.
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