title: Bidirectional reflectance distribution function of Spectralon white reflectance standard illuminated by incoherent unpolarized and plane-polarized light.
abstract: A Lambert surface would appear equally bright from all observation directions regardless of the illumination direction. However, the reflection from a randomly scattering object generally has directional variation, which can be described in terms of the bidirectional reflectance distribution function (BRDF). We measured the BRDF of a Spectralon white reflectance standard for incoherent illumination at 405 and 680 nm with unpolarized and plane-polarized light from different directions of incidence. Our measurements show deviations of the BRDF for the Spectralon white reflectance standard from that of a Lambertian reflector that depend both on the angle of incidence and the polarization states of the incident light and detected light. The non-Lambertian reflection characteristics were found to increase more toward the direction of specular reflection as the angle of incidence gets larger.
authors.affiliation: Department of Physics and Technology, University of Bergen, Bergen, Norway. Anak.Bhandari@ift.uib.no
authors.forename: Anak
authors.initials: A
authors.lastname: Bhandari
authors.forename: Børge
authors.initials: B
authors.lastname: Hamre
authors.forename: Øvynd
authors.initials: Ø
authors.lastname: Frette
authors.forename: Lu
authors.initials: L
authors.lastname: Zhao
authors.forename: Jakob J
authors.initials: JJ
authors.lastname: Stamnes
authors.forename: Morten
authors.initials: M
authors.lastname: Kildemo