Study On The Characteristics Of Laser Propagation And Attenuation Through The Fog

In this thesis, the basic physical characteristic of the fog is introduced and the empirical relationship between the attenuation coefficient and visibility for the fog is summarized. Secondly, the transport equation is solved by using the single scattering theory, the multiple scattering transport theory, as well as the discrete ordinate methods, emphasis is put on discussing the influence of the multiple scattering on the attenuation for laser propagation through the fog. A new empirical mode for the attenuation coefficient of the fog is proposed. Thirdly, the fog attenuation for Gauss beam propagation is discussed, and the computational results are compared with those with plane wave incidence. Finally, the propagation in the slant-path through the fog and free-space optical wireless communication system (OWC) in the fog environment are discussed in detail. A new solution for propagation in the slant-path through the fog is proposed. Based on the mathematical and physical modes of OWC, the influence of the fog on the receiver digital signal-to-noise ratio of OWC is analyzed.