Effect of random noise on oceanic Brillouin lidar measurement

WANG Yuanqing; HE Ju; MA Yong; YU Yin; ZHANG Nian; LIANG Kun

doi:10.7510/jgjs.issn.1001-3806.2015.01.002

In order to analyze effect of random noise of lidar system on oceanic Brillouin scattering spectroscopy and temperature inversion precision, Brillouin scattering spectrum with noise was analyzed theoretically based on Brillouin scattering theory and system noise characteristics. Simulation experiment of signal-to-noise ratio (SNR) from 1dB to 100dB was conducted. The results showed that average error and uncertainty of frequency shift and linewidth can be controlled to the order of MHz when SNR is greater than 16dB. Temperature error and uncertainty can be controlled within 0.2℃. In actual application, the average of multiple measurements is taken. The average of 10 times can ensure the requirement of SNR is smaller than 7dB with measurement accuracy of 0.2℃. The study provides the guidance for lidar remote sensing precision in seawater.

Effect of random noise on oceanic Brillouin lidar measurement

Corresponding author: LIANG Kun, liangkun@hust.edu.cn

1. Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

2. Wuhan National Laboratory for Optoelectronics, Huazhong Institute of Electro-Optics, Wuhan 430074, China

Received Date: 2014-03-18

Accepted Date: 2014-03-24

Available Online: 2015-01-25

Abstract: In order to analyze effect of random noise of lidar system on oceanic Brillouin scattering spectroscopy and temperature inversion precision, Brillouin scattering spectrum with noise was analyzed theoretically based on Brillouin scattering theory and system noise characteristics. Simulation experiment of signal-to-noise ratio (SNR) from 1dB to 100dB was conducted. The results showed that average error and uncertainty of frequency shift and linewidth can be controlled to the order of MHz when SNR is greater than 16dB. Temperature error and uncertainty can be controlled within 0.2℃. In actual application, the average of multiple measurements is taken. The average of 10 times can ensure the requirement of SNR is smaller than 7dB with measurement accuracy of 0.2℃. The study provides the guidance for lidar remote sensing precision in seawater.

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Reference (12)

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Effect of random noise on oceanic Brillouin lidar measurement

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