3-D Monte Carlo Simulation Of Inhomogeneous Random Media's Electromagnetic Scattering Characteristics

Three-dimensional radiative transfer theory has been widely used in many fields,such as meteorology,remote sensing,medicine,ocean exploration,engineering thermophysics,advanced materials and so on.Many scholars at home and abroad have done plenty of research on radiative transfer theory and it's solving methods,which greatly deepens people's understanding of the interaction between electromagnetic waves and matter,and has formed a variety of simulation methods.The solution method of vector radiative transfer equation is divided into deterministic algorithm and statistical algorithm.The most widely used methods are Monte Carlo method(MC)and Discrete Ordinate ITerative method(DOIT).This paper focuses on solving the vector radiative transfer equation using the three-dimensional Monte Carlo method,mainly about particle scattering characteristics,vector radiative transfer theory,Monte Carlo method and so on.The knowledge points and processes of using the radiative transfer theory and Monte Carlo method to solve the scattering characteristics of anisotropic random distribution media are introduced.The verification examples and simulation cases are given.The main research contents of this paper include:1.The electromagnetic scattering properties of particles are the basis for solving the threedimensional vector radiation transfer equation.Based on the basic theory of particle scattering,this paper discusses the dielectric constant models of four common metals and pure water,focusing on the calculation methods of scattering parameters of spherical particles,non-spherical particles and sparsely distributed particle layers.The scattering parameters of spherical and aspherical aluminum alloy particles were calculated by Mie theory and T matrix method respectively,and the relationship between particle scattering parameters and frequency and axial ratio was analyzed.2.The solution method of three-dimensional vector radiation transfer equation is divided into deterministic algorithm and statistical algorithm.This chapter focuses on the basic theory and implementation method of Monte Carlo method for solving vector radiative transfer equation,and discusses forward Monte Carlo method and backward Monte The difference and scope of application of the Carlo method.3.The rain cloud thermal radiation problem and the standard atmospheric active scattering problem were simulated by forward and backward Monte Carlo solutions,respectively.The simulation results are compared with the reference values of the literature to verify the correctness of the program.The simulation examples of scattering properties of anisotropic dielectric materials in X-band are given.The differences of scattering properties between spatially uniform media and inhomogeneous media are analyzed.