一种简化非Gauss场模型在随机介质中光传播问题中的应用  

Applications of a simplified non-Gaussian field model to wave propagation in turbulent media

作　　者：陈京元[1] 陈式刚[2] 王光瑞[2] 

机构地区：[1]中国工程物理研究院北京研究生部,北京100088 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《物理学报》2005年第7期3132-3139,共8页Acta Physica Sinica

基　　金：国家重点基础研究专项经费;国家自然科学基金(批准号:10147201;10247003);激光技术创新基金(批准号:20030512);国家自然科学基金重点项目(批准号:10335010);中国工程物理研究院科学技术基金(批准号:200404430)资助的课题.~~

摘　　要：为了研究大气湍流间歇性的光传播效应,构造出一种比较简单的非Gauss场模型(Poission场)用于描述大气介电常数(或折射率)随机起伏.模型特征泛函含有四个待定函数,根据大气湍流的统计均匀性,介电起伏的单点概率分布函数,以及介电起伏能谱可以选择或确定它们.对在这种简化湍流中传播的光波平均场及二阶统计矩性质进行了理论分析,并给出数值模拟的一个简单例子.In order to study the optical effects of turbulent intermittency, a simplified non-Gaussian random field model has been constructed, which can model atmospheric dielectric permittivity(or refractive-index) fluctuation approximately. Four arbitrary functions enter into the characteristic functional of this model. Using the properties of the atmospheric turbulence, such as the statistical homogeneity, the single-point probability distribution and the spectrum of the refractive-index fluctuations, these functions can be selected or determined. With these given functions, we have studied the statistical properties, especially the mean field adn the mutual coherence function, of a plane partially coherent incident wave. A simple example of numerical simulation has also been presented.

关 键 词：GAUSS 光传播 场模型 随机介质 应用 概率分布函数 大气湍流 待定函数 模型特征 介电常数 数值模拟 间歇性 起伏 折射率 均匀性 统计矩 平均场 泛函 二阶 光波 能谱 

分 类 号：O431[机械工程—光学工程]