直接测风激光雷达外场实验稳频方法

基于Fabry-Perot标准具的直接探测测风激光雷达是中高层大气风场探测的有效手段之一，系统保持长期稳定地运行是监测风场变化的基本需求；通过对DWL给出的无效探测数据进行的深入剖析，得出是激光发射频率发生了相对漂移所致；然后，搭建实验验证内在机理，得出，Nd:YAG激光器中种子激光器工作环境温度每变化1℃将导致激光发射频率产生1.536 GHz漂移，可致使透过率变化最大达46.1%，标准具工作环境温度每变化1℃相当于激光频率产生的相对漂移量737.7 MHz；当满足小于1 m/s的系统误差时，需要建立三级温控机制，将系统整体处于调控精度为1℃的恒温环境中工作，另外将种子激光器、标准具分别置于调控精度为0.001℃的恒温箱内工作，能够满足风场探测的要求。

Frequency stabilization method in direct detection Doppler wind lidar under field experiment conditions

Direct detection Doppler wind lidar based on Fabry-Perot etalon is an effective detection means of middle-upper atmospheric wind field. The long-term stabilization of system is basic requirement to perform a task. Firstly, the invalid detection data of DWL was analyzed, the relative drift of laser frequency was the main factor of invalid data. Then, the experiment was set up. To verify the mechanism of seed laser environment temperature changes and the environment temperature changes of locking etalon and the transmission of locking etalon, the result was obtained, which 1℃ temperature change of seed laser environment in Nd:YAG laser systems would cause the change of etalon transmission up to 46.1% and it was equivalent to 1.536 GHz frequency drift of laser, 1℃ temperature change of etalon environment would cause about 737.7 MHz relative drift of laser frequency. To ensure the precision less than 1 m/s resulted from system error, the method of three-step temperature control would be established. The operating room's temperature of DWL would be controlled with precision of 1℃ in the first, and then, the seed laser and the etalon would be placed in the constant temperature box with temperature control precision of 0.001℃, respectively, and the accuracy of wind field detection would be achieved.