Dr. Hong Lin Profile

Dr. Hong Lin

at Huazhong Univ of Science and Technology

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Proceedings Article | 11 October 2010 Paper

Study of ocean red tide multi-parameter monitoring technology based on double-wavelength airborne lidar system

Hong Lin, Xinming Wang, Kun Liang

Proceedings Volume 7656, 765608 (2010) https://doi.org/10.1117/12.863814

KEYWORDS: Scattering, Laser scattering, LIDAR, Signal detection, Mie scattering, Particles, Infrared lasers, Light scattering, Water, Optical simulations

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For monitoring and forecasting of the ocean red tide in real time, a marine environment monitoring technology based on the double-wavelength airborne lidar system is proposed. An airborne lidar is father more efficient than the traditional measure technology by the boat. At the same time, this technology can detect multi-parameter about the ocean red tide by using the double-wavelength lidar.It not only can use the infrared laser to detect the scattering signal under the water and gain the information about the red tise's density and size, but also can use the blue-green laser to detect the Brillouin scattering signal and deduce the temperature and salinity of the seawater.The red tide's density detecting model is firstly established by introducing the concept about the red tide scattering coefficient based on the Mie scattering theory. From the Brillouin scattering theory, the relationship about the blue-green laser's Brillouin scattering frequency shift value and power value with the seawater temperature and salinity is found. Then, the detecting mode1 of the saewater temperature and salinity can be established. The value of the red tide infrared scattering signal is evaluated by the simulation, and therefore the red tide particles' density can be known. At the same time, the blue-green laser's Brillouin scattering frequency shift value and power value are evaluated by simulating, and the temperature and salinity of the seawater can be known. Baed on the multi-parameters, the ocean red tide's growth can be monitored and forecasted.

Proceedings Article | 10 November 2007 Paper

Measuring error analysis of space Brillouin scattering based on edge detecting technology

Hong Lin, Tianlin Dong, Yong Ma, Lin Jing, Mengfan Liang

Proceedings Volume 6795, 679534 (2007) https://doi.org/10.1117/12.774206

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Nowadays, the edge detecting technology based on Brillouin scattering signal has became the most advanced research of lidar. This technology is widely applied to the areas of detecting atmosphere wind, space environment, and space objects and so on. In this lidar system based on edge detecting technology, it is important to analyze measuring error. In order to research measuring error, the space atmosphere channels are analyzed and the measuring error formula of detecting Brillouin scattering frequency shift is educed. At the same time, Brillouin scattering echo signal received by the edge detecting technology is estimated. A program is designed to simulate measuring error of detecting Brillouin scattering frequency shift at different altitudes and with different Brillouin scattering frequency shift. From the simulation results, we can find that in the ideal atmosphere conditions, the measuring error of Brillouin scattering frequency shift is less than 20MHz at 100km height and less than 5MHz at 30km height in the atmosphere. Based on the results above, we can draw a final conclusion: the edge detecting technology holds high signal-to-noise ratio and small measuring error.

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