Journal article
Anisotropic reflectance from turbid media. II. Measurements
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Author list: NEUMAN M, EDSTRÖM P, NEUMAN M, EDSTRÖM P
Publication year: 2010
Start page: 1040
End page: 1045
Number of pages: 6
ISSN: 0740-3232
View additional information: View in Web of Science™
Abstract
The anisotropic reflectance from turbid media predicted using the radiative transfer based DORT2002 model is experimentally verified through goniophotometric measurements. A set of paper samples with varying amount of dye and thickness is prepared and their angle resolved reflectance is measured. An alleged perfect diffusor is also included. The corresponding simulations are performed. A complete agreement between the measurements and model predictions is seen regarding the characteristics of the anisotropy. They show that relatively more light is reflected in large polar angles when the absorption or illumination angle is increased or when the medium thickness is decreased. This is due to the relative amount of near-surface bulk scattering increasing in these cases. This affects the application of the Kubelka-Munk model as well as standards for reflectance measurements and calibration routines.
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