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26 November 2014 Characterization of turbulent wake of wind turbine by coherent Doppler lidar
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The indispensable access to real turbulent wake behavior is provided by the pulsed coherent Doppler Light Detection and Ranging (LIDAR) which operates by transmitting a laser beam and detecting the radiation backscattered by atmospheric aerosol particles. The Doppler shift in the frequency of the backscattered signal is analyzed to obtain the line-of-sight (LOS) velocity component of the air motion. From the LOS velocities the characteristic of the turbulent wake can be deduced. The Coherent Doppler LIDAR (CDL) is based on all-fiber laser technology and fast digital-signal-processing technology. The 1.5 µm eye-safe Doppler LIDAR system has a pulse length of 200ns and a pulse repetition frequency of 10 kHz. The speed measurement range is ±50m/s and the speed measurement uncertainty is 0.3 m/s. The 2-axis beam scanner and detection range of 3000m enable the system to monitor the whole wind farming filed. Because of the all-fiber structure adoption, the system is stable, reliable and high-integrated. The wake vortices of wind turbine blades with different spatial and temporal scales have been observed by LIDAR. In this paper, the authors discuss the possibility of using LIDAR measurements to characterize the complicated wind field, specifically wind velocity deficit and terrain effects.
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Songhua Wu, Jiaping Yin, Bingyi Liu, Jintao Liu, Rongzhong Li, Xitao Wang, Changzhong Feng, Quanfeng Zhuang, and Kailin Zhang "Characterization of turbulent wake of wind turbine by coherent Doppler lidar", Proc. SPIE 9262, Lidar Remote Sensing for Environmental Monitoring XIV, 92620H (26 November 2014);

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