On the sensitivity of surface reflectance to specularity and phase function parameters in MPA modeling of radiative transfer in two-component media

ABSTRACT

The multiphase approach (MPA) is used to analyze the radiation in a semi-infinite heterogeneous medium which is exposed to a normal and collimated laser beam. The directional reflectance, R(θ), has been calculated under various types of boundary condition and scattering phase functions. The main target is to compare the influences of the two limiting cases for boundary conditions, i.e., diffuse and specular, on the normal-directional reflectance of the medium, thermal heat flux, and directional-spatial distribution of the radiation intensity. It is found that the effect of scattering phase functions on the R(θ) depends on the type of boundary condition.