Inner- and outer-scale effects on the scintillation index of an optical wave propagating through moderate-to-strong non-Kolmogorov turbulence.
Inner- and outer-scale effects on the scintillation index of an optical wave propagating through moderate-to-strong non-Kolmogorov turbulence.
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DOI：
10.1364/oe.20.004232
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发表时间：
2012-02
期刊：
影响因子：
3.8
通讯作者：
Xiang Yi;Zengji Liu;Peng Yue
中科院分区：
文献类型：
--
作者：
Xiang Yi;Zengji Liu;Peng Yue
利用非Kolmogorov湍流同时具有内尺度和外尺度参数的广义von Kármán谱模型，以及在强起伏条件下引入修正的振幅空间频率滤波函数的扩展Rytov方法，导出了在中强辐照度起伏条件下水平传播的平面波和球面波闪烁指数的理论表达式。数值结果表明，在弱涨落区域，所得到的表达式也与前人的结果相吻合。在此基础上，研究了在不同的非Kolmogorov涨落条件下，有限内、外尺度对光波闪烁指数的影响。
By use of the generalized von Kármán spectrum model that features both inner scale and outer scale parameters for non-Kolmogorov turbulence and the extended Rytov method that incorporates a modified amplitude spatial-frequency filter function under strong-fluctuation conditions, theoretical expressions are developed for the scintillation index of a horizontally propagating plane wave and spherical wave that are valid under moderate-to-strong irradiance fluctuations. Numerical results show that the obtained expressions also compare well with previous results in weak-fluctuation regimes. Based on these general models, the impacts of finite inner and outer scales on the scintillation index of an optical wave are examined under various non-Kolmogorov fluctuation conditions.