Study On Polarization Synthesis Electromagnetic Scattering Property Of Randomly Clustered Aggregate Particles

Using the discrete-dipole approximation method (DDA), this paper focuses on the non-spherical particles, electromagnetic scattering property and polarization property of some randomly clustered aggregate particles composed of spherical particles, the electromagnetic scattering property of dust particles, and the transfer characteristics of wave propagation in densely and randomly distribution soot particles. First, the DDA method is discussed in detail, and then used to study the scattering property of spherical particles and a few typical non-spherical particles. Subsequently, the accuracy and reliability of the DDA method are validated by comparing the results of the above study with the Mie theory and the T-matrix. Second, the DDA method is used to study the scattering and polarization property of randomly distribution aggregation particles, and the angle distributions of Muller scattering matrix element under different conditions are elicited.Then, based on the energy conservation and radiative transport theory, using Monte Carlo method the transfer characteristics of wave propagation in a plane-parallel layer which composed of densely and randomly distribution soot particles are solved. The total reflectivity and transmissivity changed with thickness of particles layer, incident direction of incident wave, and the kind of particles in layer are analysed. Finally, the paper touches upon the electromagnetic scattering property of aggregation dust, and the polarization angular distribution of some typical dust particle which neglect the coulomb action of charge of particles is given, considered the coulomb action, the calculation expression of differential scattering cross section and the total scattering cross section of dust particles in dust plasma is also given.