Atmospheric Light Scattering Characteristics And The Atmosphere On The Polarization State Of Scattered Light

To study light scattering characteristics and polarization state changes in the atmosphere, is to resolve the relative problems of the atmospheric optical communication. Atmospheric scattering and absorption and turbulence have great effects on quality of the atmospheric optical communication.In the first, the scattering theories of sphere are introduced, which are the foundation of the atmospheric scattering. And then the depolarization of scattered light ,which was used to describe polarization state changes ,was investigated both in Monte Carlo simulation and experimental method.A Monte Carlo algorithm was presented to model the depolarization of scattered light in the atmospheric transmission. The Stokes-Mueller formalism included polarization was employed. The algorithm is based on single-scattering event according to Mie theory and keeps track of the polarization state of individual photons in multiple scattering media. It should be noted that this simulation introduced H-G function as the complex scattering phase function other than Mie scattering phase function previously.In the experiment, the degree of the depolarization with the different artificial fog concentration was obtained. The experimental results showed that effects of fog concentration on the degree of depolarization were as well as Monte Carlo simulation. The degree of the depolarization increases with the increasing of the fog concentration, and finality depolarized to non-polarized light.The methods and results in this thesis are very valuable to the study of effects of atmospheric particles on the scattered light.