小型米散射激光雷达系统设计

为了探测对流层内大气气溶胶和卷云的光学特性以及大气水平能见度等,在阐述了大气气溶胶探测原理及信号处理方法的基础上,利用二极管激光泵浦的Nd:YAG固体激光器的二倍频波长(532 nm)激光为光源,设计了一台小型微脉冲米散射激光雷达,并利用标准大气模型对系统进行了仿真计算。仿真结果表明,在探测误差小于10%条件下,系统在白天和夜晚的探测高度分别为6 km和13 km。该系统还具有对人眼安全、能全方位扫描探测等特点,可应用于城市及特定场合(如厂区,大型公共场所)的大气环境监测,也可用于沙尘暴探测及其预警预报技术的研究。

Design of a Compact Mie Lidar System

A compact micro pulse Mie lidar which employed LD-pumped Nd:YAG laser at 532nm as a transmitter has been designed for detecting the optical properties of aerosols and cirrus in the troposphere and horizontal visibility on the basis of presenting lidar measuring principle and signal processing.A numerical calculation based on a standard atmospheric model is used to simulate ratio of signal to noise and error.The theoretical analysis shows that the system is capable of measuring aerosols with an error of less than 10% up to a height of 6 km at daytime and 13 km at nighttime.The lidar system has the characteristic of eye safety and scanning in any direction,and can be mainly applied in the real-time environmental monitoring of urban atmosphere,study of sand storm detection and prediction and so on.