We consider statistical characteristics of laser interference recorded in the focal region of an IR optoelectronic observation system under field and out-of-field illumination by laser radiation. The applicability of the analytical description of experimental histograms of the laser interference signal distribution at the photodetector array output using the probability density approximations in the form of gamma distribution and the Gaussian function is substantiated. It is shown that the specific form of these functions is determined both by the mean value (mathematical expectation) of the interference signal and by the characteristic parameter M, which depends on the statistical properties of the laser interference.

我们考虑在激光辐射的场和场外照明下在红外光电观测系统的焦点区域记录的激光干涉的统计特征。使用伽马分布形式的概率密度近似和高斯函数对光电探测器阵列输出处的激光干涉信号分布的实验直方图进行分析描述的适用性得到证实。结果表明，这些函数的具体形式由干涉信号的平均值（数学期望）和特征参数M决定，而特征参数 M 取决于激光干涉的统计特性。