研制了一台偏振-米散射激光雷达,用于卷云和沙尘气溶胶后向散射光退偏振比的探测研究。介绍了偏振-米散射激光雷达的探测原理,叙述了偏振-米散射激光雷达的结构、技术参数、测量方法和数据处理方法。给出了偏振-米散射激光雷达对合肥市西郊上空卷云的结构、退偏振比垂直廓线以及光学厚度的典型探测结果,对这些结果进行了分析和讨论。初步探测结果表明,合肥西郊上空高度在6～10 km的卷云的退偏振比在0.2～0.5之间,该激光雷达可以对卷云进行有效的探测,能较好地反映卷云及其光学特性的时空分布。

A polarization Mie lidar has been developed for measuring profiles of depolarization ratio of cirrus clouds and dust aerosols.The fundamental principle of the polarization lidar was briefly introduced.Overall structure and specifications of the polarization lidar were described as well as measurement and data processing methods.The typical observational results of depolarization ratio and structure of the cirrus over western suburb of Hefei were presented and discussed.The optical properties of the cirrus were also described.The primary observational results showed that the depolarization ratio for cirrus clouds varies from 0.2 to 0.5 within the altitude range of 6～10 km,and the lidar has the ability to measure the optical properties of cirrus clouds and their temporal and spatial variations.