Optics: measuring and testing – Of light reflection – With diffusion
Patent
1985-03-21
1988-01-05
Rosenberger, R. A.
Optics: measuring and testing
Of light reflection
With diffusion
G01N 2147
Patent
active
047172592
ABSTRACT:
A method and apparatus for determining the luster of a surface as a numerical value. The apparatus projects light from a light source through a light diffusing layer and through a layer of semitransparent material having thereon groups of parallel lines for projecting the lines onto the surface of a sample the luster of which is to be determined. The lines projected onto the surface are viewed with the eyes and the degree of distortion among the lines in the respective groups, which occurs due to the various conditions of the surface which affect the luster thereof, and to which has previously been assigned a numerical value, is determined, the numerical value of the thus determined degree of distortion for one group of figures being for the degree of gloss of the surface and the numerical value of the thus determined degree of distortion for another group being for the degree of clarity of the surface. The surface is also visually compared with a scale of predetermined lightness values having preassigned numerical values for determining the closest lightness value, and a lightness coefficient is derived from this lightness value. The sum of the gloss value and the clarity value is multiplied by the lightness coefficient for obtaining a numerical value for the luster of the surface of the sample.
REFERENCES:
patent: 2830490 (1958-04-01), Pellegrini
patent: 3396627 (1968-08-01), Rouy et al.
Gardner Laboratory, "Instruments and Methods for Determining Gloss Surface Texture, Sharpness of Reflected Images and Bloom", 1936; 356-446.
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