Measurement and modeling of the Spectralon™ spectro-polarimetric bidirectional reflectance distribution function (BRDF)

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Authors
  1. Lévesque, M.P.
  2. Dissanska, M.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
Abstract
For the Bidirectional Reflectance Distribution Function (BRDF) measurement, the Spectralon™ is the surface of reference used to calibrate the spectro-polarimetric goniometer; thus, the Spectralon™ BRDF needs to be known accurately. Thousands of spectral measurements were acquired with various configurations of incidence, viewing and polarization angles. From these measurements, we developed a model that reproduces the Spectralon™ BRDF behaviour at an accuracy of 1%. This model takes into account the polarization and spectral effects. The basic BRDF model is composed of several components, where each component corresponds to physical phenomenon. They are the deep scattering, backscattering, specular reflection (or forward scattering) and the subsurface scattering models. We also developed a polarization contrast (PC) model that allows taking into account the polarization effect. In general, the BRDF shows no wavelength dependence, excepted close to the specular reflection peak, where the spectrum slope is altered by a reddening effect. Thus, a reddening model was also developed. In the overall, the global model (BRDF angles from -75° to +75°, for any polarization angle and for tested wavelength for 350 to 2500 nm.

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Keywords
Spectralon;BRDF;Spectrum;Polarization;Reddening;DOLP;Forward scattering;Backscattering;Diffuse reflection;Specular reflection;Deep scattering;sub-surface scattering
Report Number
DRDC-RDDC-2016-R221 — Scientific Report
Date of publication
01 Nov 2016
Number of Pages
142
DSTKIM No
CA044867
CANDIS No
805241
Format(s):
Electronic Document(PDF)

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