Optics: measuring and testing – Of light reflection – With diffusion
Patent
1990-09-19
1992-10-13
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
With diffusion
3561245, 382 8, 358106, G01N 2147
Patent
active
051555581
ABSTRACT:
A method and apparatus for analyzing the appearance features of a surface with a spatially coherent beam of uniformly distributed collimated polychromatic light that is directed through a beam limiting means (or mask) and onto the surface at an acute angle of incidence. A scanned imaging detector, translatable through a sequence of focal plane positions along the optic axis between the mask and surface, measures the reflectance values associated with the scanned pixel intensities. After standardization, the scan intensity values are Fourier transformed into the spatial frequency domain to obtain an optical transfer function (OTF) and power and amplitude spectra. The visual spatial frequency response characteristic V(f) and standard psychophysical methodology is applied to mathematically determine surface appearance attributes such as orange peel, microwrinkle, cracks and crazes, distinctness of image (DOI), gloss, haze, contrast, luster, fog and texture.
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Fowler Dennis B.
Milone Michael P.
Tannenbaum Paul M.
E. I. Du Pont de Nemours and Company
Fricke Hilmar L.
McGraw Vincent P.
Reesee, II LaCharles P.
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