中国物理B ›› 2021, Vol. 30 ›› Issue (6): 64206-064206.doi: 10.1088/1674-1056/abddab

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Multiple scattering and modeling of laser in fog

Ji-Yu Xue(薛积禹)1, Yun-Hua Cao(曹运华)1,†, Zhen-Sen Wu(吴振森)1, Jie Chen(陈杰)1, Yan-Hui Li(李艳辉)1, Geng Zhang(张耿)1, Kai Yang(杨凯)1, and Ruo-Ting Gao(高若婷)2   

  1. 1 School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China;
    2 School of Environment and Safety Engineering, North University of China, Taiyuan 030000, China
  • 收稿日期:2020-12-10 修回日期:2021-01-13 接受日期:2021-01-20 出版日期:2021-05-18 发布日期:2021-05-27
  • 通讯作者: Yun-Hua Cao E-mail:yhcao@mail.xidian.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61571355 and 61401342).

Multiple scattering and modeling of laser in fog

Ji-Yu Xue(薛积禹)1, Yun-Hua Cao(曹运华)1,†, Zhen-Sen Wu(吴振森)1, Jie Chen(陈杰)1, Yan-Hui Li(李艳辉)1, Geng Zhang(张耿)1, Kai Yang(杨凯)1, and Ruo-Ting Gao(高若婷)2   

  1. 1 School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China;
    2 School of Environment and Safety Engineering, North University of China, Taiyuan 030000, China
  • Received:2020-12-10 Revised:2021-01-13 Accepted:2021-01-20 Online:2021-05-18 Published:2021-05-27
  • Contact: Yun-Hua Cao E-mail:yhcao@mail.xidian.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61571355 and 61401342).

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摘要： When a laser is transmitted in fog, and the water droplets will scatter and absorb the laser, which affects the intensity of the laser transmission and the accuracy of radar detection. Therefore, it is of great significance to study the laser transmission in the fog. At present, the main method of calculating the scattering and attenuation characteristics of fog is based on the radiation transmission theory, which is realized by a large number of numerical calculations or physical simulation methods, which takes time and cannot meet the requirements for obtaining the fast and accurate results. Therefore, in this paper established are a new laser forward attenuation model and backward attenuation model in low visibility fog. It is found that in low visibility environments, the results calculated by the Monte Carlo method are more accurate than those from most of the existing forward attenuation models. For the cases of 0.86-μm, 1.06-μm, 1.315-μm, 10.6-μm typical lasers incident on different fogs with different visibilities, a backscatter model is established, the error between the fitting result and the calculation result is analyzed, the backward attenuation fitting parameters of the new model are tested, and a more accurate fitting result is obtained.

关键词: Mie theory, Monte Carlo method, engineering model, multiple scattering, error analysis

Abstract: When a laser is transmitted in fog, and the water droplets will scatter and absorb the laser, which affects the intensity of the laser transmission and the accuracy of radar detection. Therefore, it is of great significance to study the laser transmission in the fog. At present, the main method of calculating the scattering and attenuation characteristics of fog is based on the radiation transmission theory, which is realized by a large number of numerical calculations or physical simulation methods, which takes time and cannot meet the requirements for obtaining the fast and accurate results. Therefore, in this paper established are a new laser forward attenuation model and backward attenuation model in low visibility fog. It is found that in low visibility environments, the results calculated by the Monte Carlo method are more accurate than those from most of the existing forward attenuation models. For the cases of 0.86-μm, 1.06-μm, 1.315-μm, 10.6-μm typical lasers incident on different fogs with different visibilities, a backscatter model is established, the error between the fitting result and the calculation result is analyzed, the backward attenuation fitting parameters of the new model are tested, and a more accurate fitting result is obtained.

Key words: Mie theory, Monte Carlo method, engineering model, multiple scattering, error analysis

中图分类号:  (Lasers)

  • 42.55.-f
42.62.-b (Laser applications) 42.68.Jg (Effects of aerosols?) 42.68.Ay (Propagation, transmission, attenuation, and radiative transfer)