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在非相干多普勒测风激光雷达系统中,激光的线宽与频率的稳定性是影响测量结果准确性的两个重要因素。研制的激光雷达系统采用种子注入方法产生窄线宽脉冲激光,采用碘分子饱和吸收稳频的方法,利用VB语言基于PID算法编写仪器控制程序,将种子激光器的频率锁定在碘分子吸收线1 109线的高波数边缘上,长时间(>4 h)锁频的精度≤0.5 MHz,频率的长期稳定度为3.55×10-9。设计了连续光测速系统,得出多普勒频移测得的实验值与实际斩波盘的速度值曲线,速度误差小于0.4 m/s。由此也说明,所设计的连续光测速系统可以对整个锁频系统进行校准。该实验也为测风激光雷达的建设提供指导意义。
In incoherent Doppler wind lidar systems, the stability of the linewidth and the frequency of the laser are two important factors that affect the accuracy of the measurement results. The developed laser radar system uses a seed injection method to generate a narrow linewidth pulsed laser, adopts iodine molecular saturation absorption and frequency stabilization method, and uses VB language to write an instrument control program based on PID algorithm, and locks the frequency of the seed laser on the absorption line of iodine molecule 1 109 On the high-wave-number edge of the line, the accuracy of the frequency-locked frequency is less than or equal to 0.5 MHz for a long time (> 4 h) and the long-term frequency stability is 3.55 × 10-9. The continuous light velocity system was designed and the experimental value of Doppler shift and the velocity curve of the actual chopper disk were obtained. The velocity error was less than 0.4 m / s. This also shows that the design of continuous light speed system can be calibrated the entire frequency-locked system. The experiment also provides guidance for the construction of wind-lidar.