Implementing a wind measurement Doppler Lidar based on a molecular iodine filter to monitor the atmospheric wind field over Beijing

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• 作者：Li-fang Du ; ^{lfdu@nssc.ac.cn} ; Guo-tao Yang ; Ji-hong Wang ; Chuan Yue ; Lin-xiang Chen
• 关键词：Wind measurement ; Doppler Lidar ; Seed laser injection ; Frequency locking ; PID ; Wind field
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：188
• 期：Complete
• 页码：3-11
• 全文大小：3540 K
• 卷排序：188

文摘

In this Doppler Lidar system, the frequency of the seed laser was locked to iodine molecular absorption line 1109 which is close to the upper edge of the absorption range, with long-time frequency-locking accuracy being ≤0.5 MHz and long-time frequency stability being 3.55 ×10−9. Design the continuous light velocity measuring system, which concluded the cure about Doppler frequency shift and actual speed of chopped wave plate, the velocity error is less than 0.4 m/s. The experiment showed that the stabilized frequency of the seed laser was different from the transmission frequency of the Lidar. Design of the pulsed light Chirp real-time monitoring system for monitoring laser output . And such frequency deviation is known as Chirp of the laser pulse. The real-time measured frequency difference of the continuous and pulsed lights was about 10 MHz , long-time stability deviation was around 5 MHz. Our results showed that the wind measurement Doppler Lidar implanted in Yanqing, Beijing was capable of continuously detecting in the middle and low atmosphere wind field at nighttime, providing the foundation for the future to achieve routine observations.