Generalized anisotropic turbulence spectra and applications in the optical waves' propagation through anisotropic turbulence.
Generalized anisotropic turbulence spectra and applications in the optical waves' propagation through anisotropic turbulence.
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DOI：
10.1364/oe.23.030088
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发表时间：
2015-11
期刊：
影响因子：
3.8
通讯作者：
Linyan Cui;Bindang Xue;F. Zhou
中科院分区：
文献类型：
--
作者：
Linyan Cui;Bindang Xue;F. Zhou
理论和实验研究表明，大气湍流具有各向异性和非Kolmogorov性质。在这项工作中，两个理论的大气折射率波动光谱模型推导出光波通过各向异性非Kolmogorov大气湍流传播。它们同时考虑了湍流内、外尺度的有限性和湍流涡旋在正交xy平面内的非对称性，在正交xy平面内引入了表征湍流涡旋在水平和垂直方向上非对称性的两个各向异性因子，从而不再需要湍流涡旋在xy平面内的圆对称性假设。通过假设幂律值在3和4之间变化，也允许偏离频谱模型中的经典11/3幂律行为。基于导出的各向异性谱模型和Rytov近似理论，推导了光学平面波和球面波通过弱各向异性非Kolmogorov湍流时到达角（AOA）起伏方差的表达式。计算分析了谱模型和攻角波动的方差。
Theoretical and experimental investigations have shown that the atmospheric turbulence exhibits both anisotropic and non-Kolmogorov properties. In this work, two theoretical atmosphere refractive-index fluctuations spectral models are derived for optical waves propagating through anisotropic non-Kolmogorov atmospheric turbulence. They consider simultaneously the finite turbulence inner and outer scales and the asymmetric property of turbulence eddies in the orthogonal xy-plane throughout the path. Two anisotropy factors which parameterize the asymmetry of turbulence eddies in both horizontal and vertical directions are introduced in the orthogonal xy-plane, so that the circular symmetry assumption of turbulence eddies in the xy-plane is no longer required. Deviations from the classic 11/3 power law behavior in the spectrum model are also allowed by assuming power law value variations between 3 and 4. Based on the derived anisotropic spectral model and the Rytov approximation theory, expressions for the variance of angle of arrival (AOA) fluctuations are derived for optical plane and spherical waves propagating through weak anisotropic non-Kolmogorov turbulence. Calculations are performed to analyze the derived spectral models and the variance of AOA fluctuations.