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将 Mie散射理论与蒙特卡罗法相结合分析了含吸收散射粒子半透明介质层的容积吸收特性。考虑了半透明入射表面的折射与反射、不透明壁面的漫反射、半透明介质的吸收以及粒子系的吸收和独立多次非规则各向异性散射。直接由粒子复折射率、粒径及入射辐射波长等基本参数 ,根据 Mie散射理论确定粒子系的吸收、散射因子以及非规则的各向异性散射分布。计算分析了介质层光学厚度、粒子复折射率、尺度参数、粒子系特征参数以及锥形入射时的入射倾角和锥形角对介质层容积吸收性能的影响。
The Mie scattering theory is combined with the Monte Carlo method to analyze the volumetric absorption characteristics of a translucent medium containing scattering particles. Refraction and reflection of translucent incident surface, diffuse reflection of opaque wall, absorption of semitransparent medium, absorption of particle system and irregular irregular anisotropic scattering are considered. The absorption, scattering factors and irregular anisotropic scattering distribution of the particle system are directly determined by the fundamental parameters of complex refractive index, particle size and incident radiation wavelength. The influence of the optical thickness of the medium layer, the refractive index of the particles, the scale parameters, the parameters of the particle system, as well as the incident dip angle and the taper angle on the medium layer volumetric absorption properties, were calculated and analyzed.