Study on characteristics of chirp about Doppler wind lidar system

Li-fang Du; Guo-tao Yang; Ji-hong Wang; Chuan Yue; Lin-xiang Chen

doi:10.1117/12.2256308

7 November 2016 Study on characteristics of chirp about Doppler wind lidar system

Li-fang Du, Guo-tao Yang, Ji-hong Wang, Chuan Yue, Lin-xiang Chen

Proceedings Volume 10141, Selected Papers of the Chinese Society for Optical Engineering Conferences held July 2016; 101411L (2016) https://doi.org/10.1117/12.2256308
Event: Selected Proceedings of the Chinese Society for Optical Engineering Conferences held July 2016, 2016, Changchun, China

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.

Citation Download Citation

Li-fang Du, Guo-tao Yang, Ji-hong Wang, Chuan Yue, and Lin-xiang Chen "Study on characteristics of chirp about Doppler wind lidar system", Proc. SPIE 10141, Selected Papers of the Chinese Society for Optical Engineering Conferences held July 2016, 101411L (7 November 2016); https://doi.org/10.1117/12.2256308

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