湍流大气中传输光波的波相位结构解析函数  

Wave structure function of light wave propagating in turbulent atmosphere

作　　者：张逸新[1] 陶纯堪[2] 

机构地区：[1]江南大学理学院,无锡214036 [2]南京理工大学电光学院,南京210014

出　　处：《激光技术》2004年第4期337-339,共3页Laser Technology

基　　金：教育部重点科学技术资助项目 (0 10 91)

摘　　要：在湍流大气对传输光波调制的双尺度湍涡 (大尺度湍涡和小尺度湍涡 )近似下 ,研究了用于计算描述湍流大气中传输光波相干长度变化的核心函数 (互相干函数 )的关键因子波结构函数 (WSF) ,通过建立包含不同尺度湍流因子的折射率起伏谱密度函数 ,导出了可以用于精确理论分析平面波与球面波在湍流大气中传播时所产生的诸如到达角起伏和相干性变化等效应的波相位结构函数的精确解析式 ,同时给出了便于数值计算的近似误差在2In the approximation of the modulation process of two scale-eddies (inner-scale and outer-scale eddies) for light wave propagation in turbulent atmosphere,we study the wave structure function(WSF) used to calculate the mutual coherence function from which the transverse coherence length can readily be determined for an infinite plane wave or spherical wave.Analytical expressions are derived by means of the development of the modulation model of the power spectral density of the refractive-index fluctuations which include the factor of small-scale and large-scale sizes turbulence eddies for the wave structure function associated with the propagation of infinite plane waves and spherical waves through isotropic and homogeneous turbulence.For computational case,the approximation expressions for the structure function of infinite plane waves and spherical waves propagating through isotropic and homogeneous turbulence are also developed by simple interpolation method,whose error is less than 2%.

关 键 词：光波传播 大气湍流 折射率起伏谱密度函数 相位结构函数 

分 类 号：TN012[电子电信—物理电子学] TN929.12