光束抖动频谱遥感大气湍流外尺度的理论与实验

在微扰理论的基础上导出高斯光束相位归一化频谱的普遍表达式，进而法庭是归一化光束抖动频谱的普遍表达式以及准直光束和球面波光束在均匀光路条件下的分析表达式，计算表明这些频谱中存在一个与湍流外尺度，横截风速有确定关系的峰值频率。

Theory and Experiment Study on Remote Sensing of Atmospheric Outer Scale Using Beam Motion Spectrum

Based on the smooth perturbation theory, a general expression of normalized spectrum for Gaussian beam and an analytic formula of normalized speetrum for collimated or spherical beam in a homogeneous path are given. Caleulation shows that there is a peak frequency in these spectrums and the frequency depends on turbulent outer scale and transversal wind. According to this eharaeteristie the outer scale is remote sensed successfully by using the atmospheric eoherent length measurer. At the same time five three-cup anemometers distributed evenly on the path are applied to measure average wind. Experimental results indicate that the outer scale is varied in the range of 2.6～7.0 m at the altitude of 8 m above the ground and the average value is 4.9 m.