三通道Fabry-Perot标准具在瑞利测风激光雷达中的应用

Application of triple Fabry-Perot etalon for rayleigh wind lidar

描述了利用三通道Fabry-Perot(F-P)标准具作为鉴频器直接探测多普勒风场的原理。优化了三通道F-P标准具的设计参数。介绍了基于三通道F-P标准具研制的测风激光雷达接收机的结构。利用355 nm脉冲光,通过调节PZT电压来改变标准具的腔长,对标准具的透过率曲线进行了初步测量,并分析了标准具的参数,标准具的带宽和峰值透过率较设计时分别增大了13%和10%。介绍了利用四波束反演水平风场的方法。根据标准具参数和信噪比计算的速度灵敏度较设计时下降了0.09%,风速精度在40 km以下优于5 m/s。同时,与风廓线雷达进行了比对,对163组数据的风速差进行统计,平均值为0.22 m/s,标准差为1.67 m/s,表明两者有较高的一致性。

The principle of direct detection Doppler wind lidar （DWL） with the triple Fabry-Perpt（F-P） technique was described. The parameters of triple F-P etalon was optimized. The receiver configuration of wind lidar system based on triple F-P etalon was introduced. The transmission of triple F-P etalon was measured using pulsed laser of 355 nm by changing the etalon cavity through adjusting the PZT voltage. Corpared with the designed value, the peak transmission and FWHM of triple F-P etalon increased 13% and 10% respectively. The inversion method of the vector velocity was presented to utilize four los velocity. The calculated velocity sensitivity according to the parameters and SNR reduced to 0.09%. The velocity accuracy of the Doppler lidar system was better than 5 m/s below altitude of 40 km by the velocity accuracy formula, At the same time, it was compared with a wind profile radar （WPR）. The mean differences for wind speed was 0.22 m/s, the standard deviation was 1.67 m/s with 163 pairs data The result indicates that they have higher consistency