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介绍了基于法布里-珀罗(F-P)标准具的多普勒测风激光雷达(DWL)的基本工作原理,给出了DWL的典型探测数据;对影响DWL风场探测数据精度的因素进行了深入的剖析,主要包括背景光强度、探测器的工作状态、发射激光的频率锁定、种子激光器的工作环境温度、转场或温度骤变对接收机引起的形变等因素;背景光过强会导致系统信噪比急剧降低,探测器饱和将会处于非线性工作状态,进而生成无效数据,发射激光失锁将会导致风廓线平移,种子激光器工作环境温度不恒定将会导致激光跳变等现象,影响因素逐一克服后,DWL与探空气球的风速偏差在1.4 m/s以内、风向偏差在2.2°以内。
The basic working principle of Doppler wind lidar (DWL) based on Fabry-Perot (FP) etalon is introduced and the typical detection data of DWL are given. The factors affecting the accuracy of DWL wind field detection data are given In-depth analysis, including the background light intensity, the working state of the detector, the frequency of the laser emission lock, the working temperature of the seed laser temperature, the transition or sudden temperature changes on the receiver caused by deformation and other factors; Resulting in a drastic decrease in signal-to-noise ratio of the system. The saturation of the detector will be in a non-linear working state, thereby generating invalid data. The launch of the laser mis-lock will cause the wind profile to shift. The unsteady working temperature of the seed laser will lead to laser jumps After the phenomena and influencing factors were overcome one by one, the wind speed deviation between DWL and the sounding balloon was within 1.4 m / s and the wind direction deviation was within 2.2 °.