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Spectral BRDF-based determination of proper measurement geometries to characterize color shift of special effect coatings

2013; Optica Publishing Group; Volume: 30; Issue: 2 Linguagem: Inglês

10.1364/josaa.30.000206

1520-8532

Alejandro Ferrero, Ana M. Rabal, Joaquín Campos Acosta, Francisco M. Martínez‐Verdú, Elísabet Chorro, Esther Perales, Alicia Pons Aglio, María Luisa Hernanz,

Advanced optical system design

A reduced set of measurement geometries allows the spectral reflectance of special effect coatings to be predicted for any other geometry. A physical model based on flake-related parameters has been used to determine nonredundant measurement geometries for the complete description of the spectral bidirectional reflectance distribution function (BRDF). The analysis of experimental spectral BRDF was carried out by means of principal component analysis. From this analysis, a set of nine measurement geometries was proposed to characterize special effect coatings. It was shown that, for two different special effect coatings, these geometries provide a good prediction of their complete color shift.