Mr. Jiangfeng Shao Profile

Jiangfeng Shao

at North Minzu Univ

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Proceedings Article | 15 January 2021 Paper

Mie-scattering Lidar system with a solar-blind wavelength for atmospheric boundary layer

Jiangfeng Shao, Dengxin Hua, Li Wang, Yixuan Zhao, Yan Zhao, Zenghui Liu, Xinyue Cui, Zhenyu Han

Proceedings Volume 11761, 117610A (2021) https://doi.org/10.1117/12.2586278

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A solar-blind lidar system is developed by using Nd:YAG laser to produce 266nm wavelength at the frequency of 10Hz as the light source to to detect the height of boundary layer in Xi'an area. The observation experiment and analysis are made.The solar background light has no 266nm wavelength and the influence of it can be ignored in the daytime, and then all day detection can be realized. It can be detected in the daytime and nighttime. The wavelength of 266nm absorbed by ozone is considered only. The absolute minimum of first derivative and second derivative of the range-squared-corrected lidar signal are employed to retrieve height of boundary layer. Based on the observation of atmosphere in daytime and nighttime, the heights of atmospheric boundary layer are 0.44km and 0.47km, and the influences of meteorological factors and human activities on the height of atmospheric boundary layer are analyzed. The results showed that the lidar can satisfied the need for detection of troposphere atmospheric aerosol particles at all time and are beneficial to offer practical and effective data for monitoring atmospheric environment in Xi'an aera.

Proceedings Article | 15 October 2015 Paper

The observations of aerosol optical and microphysical properties by using a multi-wavelength lidar

Jiangfeng Shao, Jiandong Mao

Proceedings Volume 9674, 96741H (2015) https://doi.org/10.1117/12.2199489

KEYWORDS: Atmospheric particles, LIDAR, Aerosols, Fiber optic gyroscopes, Atmospheric sensing, Atmospheric optics, Signal detection, Troposphere, Avalanche photodetectors, Atmospheric modeling

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In order to detect the atmospheric aerosol optical, micro-physical characteristics and the mixed layer height, an all time multi-wavelength lidar was developed at Beifang University of Nationalities and some observations were carried out over Yinchuan area. The geometric overlap factors are corrected. The data processing and inversion algorithms of multi-wavelength lidar were discussed. Also the Angstrom indexes and the mixed layer height under different weather were analyzed. In sunny weather the mixed layer height is significantly higher. However in fog weather the mixed layer height is lower than that of sunny weather. The Angstrom index is used to analyze the particle size distribution in different weather. In the lower troposphere the Angstrom index A_1064/355 is biggest, the A_1064/532 is middle and the A_532/355 is smallest in sunny day. However in fog day, the A_532/355 is biggest, the middle is A_1064/532 and the smallest is A_1064/355. Therefore compared with the sunny day the situation is contrast in the fog day. The results show that in sunny day the fine particles are dominant in the atmosphere and in fog day the coarse particles are the main in the atmosphere. The observation results are beneficial to analyze the spatial and temporal evolution of aerosol particles in Yinchuan area.

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