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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。
Describes the principle of direct detection of Doppler wind fields using a three-channel Fabry-Perot (F-P) etalon as a frequency discriminator. Optimized the design parameters of the three-channel F-P etalon. The structure of wind laser lidar developed based on three-channel F-P etalon is introduced. The 355 nm pulsed light was used to change the cavity length of the etalon by adjusting the PZT voltage. The transmittance of the etalon was initially measured. The parameters of the etalon, the bandwidth of the etalon and the peak transmittance were compared. Respectively, an increase of 13% and 10%. The method of using four beams to invert the horizontal wind field is introduced. The speed sensitivity calculated based on etalon parameters and signal-to-noise ratio decreased by 0.09% compared with the design, and the accuracy of wind speed was better than 5 m / s under 40 km. At the same time, compared with the wind profiler radar, the wind speed difference of 163 groups of data is statistically calculated with an average of 0.22 m / s and a standard deviation of 1.67 m / s, indicating a high consistency between the two.