Abstract

Solar reflectance spectra of pigmented coatings have been obtained from spectroscopic measurements involving integrating sphere attachments. We demonstrate that measured and computed reflectances of an extended four-flux model [Appl. Opt. 37, 2615 (1998)] whose average path-length parameters (APP’s) and forward-scattering ratios (FSR’s) are explicitly evaluated from a multiple-scattering approach at the front or back interface of the particulate coatings display fairly good agreement. The agreement of these properties in a standard four-flux model [Appl. Opt. 23, 3353 (1984)], which neglects the spectral dependence of the APP and FSR, is found in the near infrared. Good agreement between these two four-flux approaches over the solar spectral range is obtained when the mean values of the APP’s and FSR’s are used in the standard model.

© 2001 Optical Society of America

Generalized four-flux radiative transfer model

William E. Vargas
Appl. Opt. 37(13) 2615-2623 (1998)

Two-flux radiative transfer model under nonisotropic propagating diffuse radiation

William E. Vargas
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Forward average path-length parameter in four-flux radiative transfer models

William E. Vargas and Gunnar A. Niklasson
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Generalized method for evaluating scattering parameters used in radiative transfer models

William E. Vargas and Gunnar A. Niklasson
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Average path-length parameter of diffuse light in scattering media

Camilo A. Arancibia-Bulnes and Jesús C. Ruiz-Suárez
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