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为了观察大气引起的激光光束畸变,利用激光散斑理论中的Rice函数分布模型,分析了大气对LADAR激光作用产生激光散斑的本质及其变化趋势,进而建立了新的研究大气引起激光散斑变化的实验方法。根据反映在激光散斑Rice函数模型中束比值大小及分布,描述了远场激光散斑对比度变化规律。其中束比值的减小说明大气扰动使大气传播中激光产生了随机成分,束比值的分布变化说明大气对激光束的发散作用。结果表明:Rice函数分布模型散斑测量法可用于分析大气扰动的作用机制。
In order to observe the laser induced laser beam distortion in the atmosphere, the distribution function of the Rice function in the laser speckle theory is used to analyze the nature and the trend of the laser speckle in LADAR laser. Then a new atmospheric speckle Change the experimental method. According to the size and distribution of beam ratio reflected in the laser speckle Rice function model, the variation of the far-field laser speckle contrast is described. The decrease of bundle ratio indicates that the atmospheric disturbance causes the laser to produce a random component in the atmosphere. The distribution of the beam ratio indicates the divergence of the atmosphere to the laser beam. The results show that the Rice function distribution model speckle measurement method can be used to analyze the mechanism of atmospheric disturbance.