Diffuse reflectance of TiO2 pigmented paints: Spectral dependence of the average pathlength parameter and the forward scattering ratio |
| |
Authors: | William E Vargas Alvaro Amador |
| |
Institution: | a Centro de Investigación en Ciencia e Ingeniería de Materiales and Escuela de Física, Universidad de Costa Rica, 2060 San José, Costa Rica b Escuela de Física, Instituto Tecnológico de Costa Rica, Cartago, Costa Rica c The Ångström Laboratory, Department of Engineering Sciences, Uppsala University, Box 534, S-751 21 Uppsala, Sweden |
| |
Abstract: | Diffuse reflectance spectra of paint coatings with different pigment concentrations, normally illuminated with unpolarized radiation, have been measured. A four-flux radiative transfer approach is used to model the diffuse reflectance of TiO2 (rutile) pigmented coatings through the solar spectral range. The spectral dependence of the average pathlength parameter and of the forward scattering ratio for diffuse radiation, are explicitly incorporated into this four-flux model from two novel approximations. The size distribution of the pigments has been taken into account to obtain the averages of the four-flux parameters: scattering and absorption cross sections, forward scattering ratios for collimated and isotropic diffuse radiation, and coefficients involved in the expansion of the single particle phase function in terms of Legendre polynomials. |
| |
Keywords: | 42 50Ct 42 79 Wc 78 35 +c 85 40 Xx |
本文献已被 ScienceDirect 等数据库收录! |
|