Method for determining the bidirectional reflectance distribution function (BRDF) of a surface
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United States of America Patent
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Jul 19, 2016
Grant Date -
Oct 4, 2012
app pub date -
Nov 28, 2011
filing date -
Mar 30, 2011
priority date (Note) -
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Abstract
A method for determining the bidirectional reflectance distribution function of a generally plane rough surface of a specimen made of a given material includes acquiring a refractive index of the material, the spectrum of total reflectance measured on the specimen, and the geometry of the profile of the surface. The geometry is determined by: detecting the height and approximating the surface of the specimen as a distribution of plane triangular microfaces. For each direction of incidence of the light on the surface of the specimen and for each direction of observation there is determined the angular orientation of the microfaces contributing to reflecting in a specular way the light incident in the direction of observation. The Fresnel factor defining the specular reflectance of each microface is determined. The total BRDF is determined as the sum of a Lambertian component and of a specular component.
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