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基于瑞利散射的多普勒测风激光雷达在利用频率差分技术测量风场的过程中,激光脉冲频率随室温和谐振腔温度变化而产生抖动和漂移,给系统测量精度带来极大影响。为了解决激光频率长期漂移给风场测量带来的影响,设计了一种频率实时动态跟踪硬件电路。介绍了该硬件电路的设计思想、关键技术和核心器件的选取,并利用该硬件电路与米散射测风激光锁频技术进行对比实验。结果表明:在激光频率漂移较小条件下,基于瑞利散射测风激光雷达的频率实时跟踪技术可以使激光脉冲频率稳定在设定的测量精度范围之内,SD=3.07MHz;在激光频率漂移相对较大的条件下,SD=6.18MHz,维持在测量高灵敏度区,频率相对稳定性得到了很大改善,提高了锁定信息反馈的实时性,提高了风场测量精度。
Doppler wind lidar based on Rayleigh scattering in the use of frequency difference technique to measure the wind field, the laser pulse frequency with the room temperature and the temperature changes of the resonator jitter and drift, the system measurement accuracy has a tremendous impact. In order to solve the influence of long-term laser frequency drift on wind field measurement, a real-time frequency tracking hardware circuit is designed. The design idea, the key technology and the selection of the core device of the hardware circuit are introduced. The hardware circuit is compared with the meter - locked laser wind - up frequency lock technique. The results show that under the condition of small laser frequency drift, the real-time frequency tracking technique based on Rayleigh scattering wind lidar can stabilize the laser pulse frequency within the set measurement accuracy range, SD = 3.07MHz. When the laser frequency drift Relatively large conditions, SD = 6.18MHz, to maintain the measurement sensitivity zone, the relative stability of the frequency has been greatly improved, improve the real-time locking information feedback and improve the wind measurement accuracy.