利用红光激光器、3M微晶棱镜阵列反光膜和长焦高速CCD相机构建的折返路径激光成像探测系统,进行了湍流大气中1 km传输路径上的 激光光斑回波成像探测实验,同时使用激光闪烁仪实时监测湍流强度变化。首先对获得的激光回波光斑图像的强度分布进行了 直观分析,比较了在不同湍流强度下折返路径激光光斑形态的差异,接着统计计算了不同湍流强度下,光斑光强概率密度分布与 光斑图像位置和区域面积大小的关系。结果表明: 折返路径下的激光传输光强起伏概率密度函数在光斑上的各处基本都 符合对数正态分布,但在质心附近的区域符合程度更高,且符合程度与接收面积大小呈负相关。同时湍流强度对回波 光斑平面上不同位置之间、不同接收区域大小之间符合正态分布程度的差异有一定影响。

The laser spot echo imaging experiment was carried out on a 1 km transmission path in a turbulent atmosphere using a reentry path laser imaging detection system constructed by red laser, 3M microcrystalline prism array reflector and telephoto high speed CCD. At the same time, the scintillometer was used to monitor the changes of turbulence intensity. Firstly, the intensity distribution of the obtained laser spot image is analyzed intuitively. The difference of the laser spot pattern under different turbulence intensity is compared. Then, the probability distribution of the light intensity in the range of different turbulence intensity and different aperture is calculated statistically. The results show that the light intensity probability density function basically follows the lognormal distribution in the vicinity of the focal spot, but the area near the center of mass is in a higher degree, and its degree of compliance is negatively correlated with the size of the receiving area. At the same time, the turbulence intensity affects the difference of the normal distribution between the different positions of the spot echo plane and the different receiving area.