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基于法布里-珀罗干涉仪的多普勒测风激光雷达可以实现从对流层到中层大气的高时空分辨率风场探测。然而,实际风场观测时,反演出的径向风速总会存在一个偏差,需要外部的参考风场来消除。从理论出发,分析了出现偏差的原因,得出主要影响因素是法布里-珀罗干涉仪和种子激光器的环境温度。随后对该温度的影响进行了实验研究。通过分别对种子激光器和法布里-珀罗干涉仪环境温度的精确控制,测量激光通过已标定的法布里-珀罗干涉仪的透过率来监测相对频率的漂移与温度之间的关系。实验结果表明,环境温度会影响频率漂移,理论上,对于355 nm测风激光雷达系统,控制1 m/s的径向风速漂移,种子激光器环境温度引起的频率漂移系数为1650 MHz/K,温度控制的精度须小于0.004 K;法布里-珀罗干涉仪环境的温度引起的频率漂移系数为799 MHz/K,温度控制的精度须小于0.007 K。
The Doppler wind lidar based on the Fabry-Perot interferometer can detect high spatial and temporal resolution wind fields from the troposphere to the middle atmosphere. However, there is always a deviation of the radial wind speed from the actual observation of the wind field, which needs the external reference wind field to eliminate. Based on the theory, the causes of deviation were analyzed. The main influencing factors were the ambient temperature of Fabry - Perot interferometer and seed laser. Then the impact of temperature on the experimental study. The relationship between drift in relative frequency and temperature was monitored by measuring the laser transmittance through a calibrated Fabry-Perot interferometer by precisely controlling the ambient temperature of the seed laser and the Fabry-Perot interferometer, respectively . The experimental results show that the ambient temperature can affect the frequency drift. Theoretically, for the 355 nm wind laser Lidar system, the radial wind speed drift of 1 m / s is controlled, the frequency drift coefficient caused by the seed laser ambient temperature is 1650 MHz / K, The accuracy of the control must be less than 0.004 K; the temperature drift factor of the Fabry-Perot interferometer environment is 799 MHz / K and the temperature control accuracy is less than 0.007 K.