基于法布里-珀罗标准具的532nm多普勒测风激光雷达系统设计和分析

Design and analysis of 532nm Doppler wind lidar with Fabry-Perot etalon

设计了采用532 nm种子注入稳频钇铝石榴石(YAG)激光器作为辐射源的基于四通道法布里-珀罗标准具的瑞利和米散射测风激光雷达系统。介绍了激光雷达的多普勒测量基本原理;给出了雷达系统的主要参数,重点对基于分子后向散射信号的外侧双通道标准具的带宽、自由谱间距、峰值间距等指标进行了详细设计与分析,确定了内侧双通道标准具参数;对全系统速度灵敏度、信噪比与探测距离的关系进行了理论模拟。结果表明,可以实现从边界层至对流层高低空一体化探测。

A 532 nm wind lidar system based on a tetrad Fabry-Perot（FP） etalon using steady frequency YAG laser as laser radiation source was designed.In this paper,the fundamental theory of the Doppler wind lidar is introduced,major parameters of emission system,receiver system,emission and receiver optics system and control system were presented.The parameters of the bandwidth and free spectrum range（FSR） width and the width of peak values of outboard double channels based on molecule backscattered signals are designed and analyzed,the parameters of inboard double channels based on aerosols are also designed.The velocity and signal noise ratio of the whole system is simulated.When the value of full width at half maximum is 1.75 GHz,the values of range peaks of the tetrad FPI etalon is 1.1,1.75,1.1 GHz,respectively,the system based on outboard double channels may be substituted for boundary atmosphere to lower troposphere wind detection by the system based on inboard double channels.The wind detection of boundary atmosphere to troposphere based on a system may be achieved.