Mr. Cheng Song Profile

Cheng Song

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Publications (2)

Proceedings Article | 12 April 2023 Paper

Mid-infrared IPDA lidar for probing atmospheric toluene concentration

Mingxuan Duan, Shichun Li, Cheng Song, Wenhui Xin, Dengxin Hua, Fei Gao

Proceedings Volume 12565, 125652C (2023) https://doi.org/10.1117/12.2662615

KEYWORDS: Signal to noise ratio, LIDAR, Atmospheric sensing, Mid-IR, Gases

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Proceedings Article | 4 April 2023 Paper

The enhancement effect of backscattering for laser propagation through turbulent atmosphere

Cheng Song, Shichun Li, Yingchun Gao, Fei Gao, Dengxin Hua, Yuehui Song, Zuxin Huang

Proceedings Volume 12617, 126173H (2023) https://doi.org/10.1117/12.2665996

KEYWORDS: Backscatter, Atmospheric propagation, Laser beam propagation, Receivers, Zernike polynomials, Atmospheric modeling, Optical simulations, Atmospheric optics, Beam propagation method, Turbulence

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Owing to the enhancement effect of backscattering for laser propagation through turbulent atmosphere, a comparison between theoretical analysis and model simulation based on random phase screen is conducted, and then a preliminary experiment observation is carried out for the enhanced backscattering effect for laser propagation in turbulence atmospheric. Firstly, from the generalized Huygens-Fresnel principle and the mutual interference effect, the light intensity expression and the backscattering enhancement coefficient are derived for the backscattering enhancement effect of laser propagation through turbulence atmospheric to the reflecting screen. The backscattering enhancement coefficient based on theoretical analysis increases as laser transmission distance increases, whereas it decreases to 1 with the increase of the distance between receiver and transmitter. Furthermore, random phase screens are respectively established for turbulence through the power spectrum inversion method, Zernike polynomial method and low-high frequency combination method and are compared with the theoretical values. Then the laser propagation through turbulent atmosphere is simulated to verify that the laser propagation through turbulence atmospheric possesses backscattering enhancement effect, and the influence of the factors on the backscattering enhancement effect is analyzed. Simulations show that there is a saturation effect of the enhanced backscattering, and its value is approximately 1.4. While the atmospheric refractive index structure constant is 10 ^-13, the enhanced backscattering effect gradually reach saturation at the laser propagating to 600m. Whereas the enhanced backscattering effect gradually reach saturation with the atmospheric refractive index structure constant of 10 ^-14 at the distance of 1500m. The enhanced backscattering effect of laser propagation through turbulent atmosphere is preliminarily observed through an experimental system. The results show that the backscattering enhancement effect is positively correlated with the change of the wind speed in the area where the laser passes through, decreases as the temperature drop, and increases with the increase of the laser propagating distance, and that the backscattering enhancement coefficient is less than 1.4.

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