Open AccessPrimary facility for traceable measurement of the BSSRDF
Author(s) -
Pablo Santafé-Gabarda,
Alejandro Ferrero,
Néstor Tejedor-Sierra,
J. Campos
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.439108
Subject(s) - radiance , optics , scattering , resolution (logic) , angular resolution (graph drawing) , image resolution , irradiance , bidirectional reflectance distribution function , remote sensing , materials science , physics , reflectivity , computer science , mathematics , combinatorics , artificial intelligence , geology
The bidirectional scattering-surface reflectance distribution function (BSSRDF) is the function that describes the variation of the radiance of the elementary areas of a surface with respect to the directionally incident radiant flux on that surface. Measurements of the BSSRDF are important for characterizing the translucency of objects and for obtaining those optical parameters affecting volume scattering. However, to date, no traceable measurements of this function are available, since, likely due to its technical complexity, no standard measurement procedure has been established. We have developed a primary facility for measuring the BSSRDF based on a gonio-spectrophotometer with spatial resolution in the collection, spectral resolution in the irradiation, and angular resolution both for irradiation and collection directions. The BSSRDF of twelve homogeneous and translucent samples (with controlled values for the mean diameter of the scattering particles and their concentration) have been measured with relative uncertainties below 3% inside the irradiated area. Some results are shown and commented. This primary facility will allow the BSSRDF scale to be transferred to other instruments.