Wang Fei, Toselli Italo, Li Jia, Korotkova Olga
Opt Lett. 2017 Mar 15;42(6):1129-1132. doi: 10.1364/OL.42.001129.
An experimental study has been performed of a laser beam propagating horizontally through the near-ground atmosphere above a grassy field at the University of Miami (UM) Coral Gables campus. The average intensity, scintillation index, and intensity correlation function are measured in the receiver plane for three channels with different turbulent conditions and at three different heights above the ground. Our results reveal that along short links (210 m) only the intensity correlation function captures the anisotropic information of turbulence, corresponding to the refractive index anisotropy ellipse of atmospheric fluctuations. In addition, we report an interesting phenomenon relating to turbulence eddy orientation near the ground. We confirmed that the experimental results are in agreement with the numerical simulations based on the multiple phase-screen method. Our findings provide an efficient method of determining the anisotropic parameters of atmospheric turbulence.
在迈阿密大学（UM）珊瑚阁校区的一片草地之上，开展了一项关于激光束水平穿过近地面大气的实验研究。针对三种具有不同湍流条件的通道以及地面上方三个不同高度，在接收平面中测量了平均强度、闪烁指数和强度相关函数。我们的结果表明，在短链路（210米）中，只有强度相关函数能够捕捉到湍流的各向异性信息，这与大气波动的折射率各向异性椭圆相对应。此外，我们报告了一个与近地面湍流涡旋方向有关的有趣现象。我们证实，实验结果与基于多相位屏方法的数值模拟结果一致。我们的研究结果提供了一种确定大气湍流各向异性参数的有效方法。
