Analysis on the volumetric absorption characteristics of a semitransparent medium layer with absorbing and scattering particles

The Monte Carlo method is combined with the Mie scattering theory to analyze the volumetric absorption characteristics of a semitransparent medium layer with absorbing and scattering particles. The absorption and independent irregular multi-anisotropic scattering of the particles are considered along with the refraction and specular reflection of the semitransparent incident surface, the diffuse reflection of the opaque wall and the absorption of the semitransparent medium. By the Mie scattering theory, the absorptive and scattering properties of the particles are directly predicted from the basic parameters such as the complex refractive index, the particle diameter and the wavelength of the irradiation. The influences on the volumetric absorption are investigated, which are exerted by the particle dimension parameter, the relative complex refractive index and other relevant parameters. These parameters include the characteristic parameter of the particles, the optical thickness of the medium as well as the incident angle and the conicity of the conic irradiation.