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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26812–26819

A single analytical model for sparkle and graininess patterns in texture of effect coatings

A. Ferrero, J. Campos, A. M. Rabal, and A. Pons  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 26812-26819 (2013)

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Flakes in effect coatings, which are responsible for its color shift, are not perfectly horizontally oriented, producing a non uniform texture when observed from a distance of around one meter or less. If the coating is illuminated by a diffuse source, a granular appearance is observed, called graininess. But when the coating is illuminated by unidirectional light, some luminous spots on a dark background appear, effect that is known as sparkle. The characterization of these two textures is getting more important for automotive industry because of the high percentage of cars with effect coatings and because improvements in imaging technology allows this effect to be measured by, for instance, commercial instruments as BYK-mac. A single analytical model to understand and radiometrically characterize both sparkle and graininess in effect coatings is presented and studied in this work. It allows both patterns to be explained and, despite its simplicity, includes variables related to the optical system (Point Spread Function (PSF) and size of the entrance pupil), its distance to the coating, the diffusion grade of the illumination, the illumination and observation directions, and coating parameters.

© 2013 OSA

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(240.6700) Optics at surfaces : Surfaces

ToC Category:
Thin Films

Original Manuscript: July 29, 2013
Revised Manuscript: September 19, 2013
Manuscript Accepted: September 27, 2013
Published: October 30, 2013

A. Ferrero, J. Campos, A. M. Rabal, and A. Pons, "A single analytical model for sparkle and graininess patterns in texture of effect coatings," Opt. Express 21, 26812-26819 (2013)

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