混合漫射近似模型的漫反射理论及其模拟实验研究

研究了一个改进的漫射近似模型.该模型将漫射近似中的漫射系数D用描述P₃近似的漫射系数D_asym替代.推导了这个混合的漫射近似模型在单点源近似和外推边界条件下的反射率R_Hybrid(ρ)的解析表达式，比较了有效反照率a′对标准漫射近似R_DA(ρ)和R_Hybrid(ρ关键词： 漫射近似 P₃近似')" href="#">P₃近似 混合漫反射模型 强吸收

Study of diffuse reflectance based on a hybrid diffusion approximation and simulating experiment

A modified diffusion approximation is investigated. In this theoretical model, diffusion coefficient D of the standard diffusion approximation is substituted by diffusion coefficient D_asym of P₃ approximation. Analytic solution R_Hybrid(ρ) of this hybrid diffusion for reflectance in single source approximation and steady-state case with extrapolated boundary is obtained; influences of the transport albedo a′ on the standard diffusion approximation R_DA(ρ) and the hybrid diffusion approximation R_Hybrid(ρ) are compared; recovering of optical parameters from diffuse reflectance R_Hybrid(ρ) is demonstrated, and the errors and application ranges are studied. The results show that this hybrid diffusion approximation R_Hybrid(ρ) can be used in strong absorption media and at short source-detector separation.