Method and apparatus for color matching paints

Details Method and apparatus for color matching paints Method and apparatus for color matching paints

1998-09-30

2000-12-26

Font, Frank G.

Optics: measuring and testing

Of light reflection

G01N 2155

Patent

active

061668141

ABSTRACT:
A method for characterizing a coating comprising a pigment and metallic flakes, said method by directing beams of light toward a coating; measuring the reflectance of light from the coating at the specular angle; measuring the reflectance of light from the coating at one or moren on-specular angles; analyzing said measured light at the specular and non-specular angles as a function of wavelength; and determining the K/S of the pigment and the volume fraction of said metal flakes within the coating from the measurements of the specular and non-specular reflectance; wherein K is the absorption cross-section of the pigment multiplied by its volume concentration; and S is the scattering cross-section of the pigment multiplied by its volume concentration.

REFERENCES:
patent: 4572672 (1986-02-01), Orchard et al.
patent: 4711580 (1987-12-01), Venable
patent: 5231472 (1993-07-01), Marcus et al.

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