同步测量大气湍流折射率结构常数和内尺度的光学方法
Optical method for simultaneously measuring refractive-index structure parameter and inner scale of atmospheric turbulence
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摘要: 基于不同波长的光闪烁，采用修正的大气湍流Hill谱模型，提出了一种同时反演大气湍流内尺度及折射率结构常数的方法。假定内尺度在某一个范围内取值，对于不同波长的闪烁指数，如果当内尺度取某一定值时，由光传输理论计算的C2n(λ1,…)和C2n (λ2,…)相等，反演成功。根据此原理设计了三波长闪烁计并在某地进行了外场测量。近地面大气湍流的内尺度一般在2~10 mm之间，且随折射率结构常数（其量级为10-16~10-13）的变化而变化，两者之间存在一定的正相关；任意两波长组合进行反演得到的内尺度(或折射率结构常数)值具有自洽性，其相关系数的最小值为0.81，因此证明了该方法的可行性。Abstract: The principle is as follows: Supposing the inner scale has a specific value, the refractive-index structure parameters are equal for different wavelengths, which is based on the optical-propagation theory using the modified Hill spectrum with the inner scale effect. According to the proposed inversion principle, a three-wavelength scintillometer was designed for the reliability verification in the laser propagation trials. The results show that the inner scale near the land surface is generally between 2 and 10 mm, and it will vary accordingly as the refractive-index structure parameter changes. Moreover, some experiments also demonstrate that the method is reliable by the inverted values of any two wavelengths, of which the minimum correlation coefficient is 0.81.
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