大尺度相干结构的光学特性研究

Study of Optical Characteristic of Large-Scale Structure

根据大气近地面层对流湍流池的实验结果 ,提出了一种用于描述大尺度相干结构的立体模型———椭球结构模型。计算并分析了该大尺度相干结构对光传输波前相位结构函数的影响 ,且和小尺度湍流结构作了比较。对于相同的参数 ,光线平行于间断面时造成的影响大于垂直于间断面 ;一般情况下 ,影响都很小 ;但当光线平行穿过具有三角波模型结构的间断面时可能产生较大的影响。

According to the experimental results from atmospheric surface-layer and turbulence cell, a cubic model of ellipsoid depicting large-scale structure was put forward. The effect of large-scale structure on wavefront during light transporting is computed and analyzed, and compared with the small-scale effect. With the same parameters of model, when the ray is parallel to the discontinuous plane the effect on phase structure function of wavefront is a little larger than that when the ray is perpendicular to the discontinuous plane. Generally, the effect is small. When the large-scale structure is one-dimensional and the ray is parallel to the discontinuous plane, the effect is large.