Imaging Components, Systems, and Processing

All‐fiber pulse coherent Doppler LIDAR and its validations

[+] Author Affiliations
Lingbing Bu, Zujing Qiu, Haiyang Gao

Nanjing University of Information Science and Technology, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, No. 219 Ningliu Road, Nanjing 210044, China

Xiaopeng Zhu, Jiqiao Liu

Shanghai Institute of Optics and Fine Mechanics, Key Laboratory of Space Laser Communication and Detection Technology, Chinese Academy of Sciences, No. 390 Qinghe Road, Jiading District, Shanghai 201800, China

Opt. Eng. 54(12), 123103 (Dec 08, 2015). doi:10.1117/1.OE.54.12.123103
History: Received July 21, 2015; Accepted November 4, 2015
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Abstract.  An all‐fiber pulsed coherent Doppler LIDAR (CDL) system is described. It uses a fiber laser as a light source at a 1.54μm wavelength, producing 200μJ pulses at 10 kHz. The local oscillator signal is mixed with the backscattered light (of different frequency) in the fiber. The atmospheric wind speed is determined through the fast Fourier transform applied to the difference frequency signal acquired by an analog‐to‐digital converter card. This system was used to measure the atmospheric wind above the upper‐air meteorological observatory in Rongcheng (37.10°N, 122.25°E) of China between January 7 and 19, 2015. The CDL data are compared with sounding‐ and pilot‐balloon measurements to assess the CDL performance. The results show that the correlation coefficient of the different wind‐speed measurements is 0.93 and their discrepancy 0.64m/s; the correlation coefficient for wind‐direction values is 0.92 and their discrepancy 5.8 deg. A time serial of the wind field, which benefits the understanding of atmospheric dynamics, is presented after the comparisons between data from CDL and balloons. The CDL system has a compact structure and demonstrates good stability, reliability, and a potential for application to wind‐field measurements in the atmospheric boundary layer.

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© 2015 Society of Photo‐Optical Instrumentation Engineers

Citation

Lingbing Bu ; Zujing Qiu ; Haiyang Gao ; Xiaopeng Zhu and Jiqiao Liu
"All‐fiber pulse coherent Doppler LIDAR and its validations", Opt. Eng. 54(12), 123103 (Dec 08, 2015). ; http://dx.doi.org/10.1117/1.OE.54.12.123103


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