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Proceedings Paper

Study on characteristics of chirp about Doppler wind lidar system
Author(s): Li-fang Du; Guo-tao Yang; Ji-hong Wang; Chuan Yue; Lin-xiang Chen
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Paper Abstract

In the doppler wind lidar, usually every 4MHz frequency error will produce wind error of 1m/s of 532nm laser. In the Doppler lidar system, frequency stabilization was achieved through absorption of iodine molecules. Commands that control the instrumental system were based on the PID algorithm and coded using VB language. 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 (>4h) frequency-locking accuracy being≤0.5MHz and long-time frequency stability being 10-9 . The experimental result indicated that the seed frequency and the pulse laser frequency have a deviation, which effect is called the laser chirp characteristics. Finally chirp test system was constructed and tested the frequency offset in time. 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 10MHz, long-time stability deviation was around 5MHz. After experimental testing technology mature, which can monitoring the signal at long-term with corrected the wind speed.

Paper Details

Date Published: 7 November 2016
PDF: 9 pages
Proc. SPIE 10141, Selected Papers of the Chinese Society for Optical Engineering Conferences held July 2016, 101411L (7 November 2016); doi: 10.1117/12.2256308
Show Author Affiliations
Li-fang Du, National Space Science Ctr. (China)
Guo-tao Yang, National Space Science Ctr. (China)
Ji-hong Wang, National Space Science Ctr. (China)
Chuan Yue, National Space Science Ctr. (China)
Lin-xiang Chen, National Space Science Ctr. (China)

Published in SPIE Proceedings Vol. 10141:
Selected Papers of the Chinese Society for Optical Engineering Conferences held July 2016
Yueguang Lv; Weimin Bao; Guangjun Zhang, Editor(s)

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