Optics: measuring and testing – Of light reflection – With diffusion
Patent
1982-12-27
1985-07-09
Rosenberger, R. A.
Optics: measuring and testing
Of light reflection
With diffusion
356447, 356125, 350275, G01N 2155, G01N 2157
Patent
active
045278989
ABSTRACT:
In order to obtain an objective measurement of paint gloss on a flat or slightly curved surface, a distinctness of image instrument is provided having a light source for projecting a light beam onto the test surface, a detector responsive to reflected light from the surface, an aperture at the detector, a chopper near the light source and a lens for imaging the chopper blade on the plane of the aperture so that the sharpness of the image depends upon the reflective quality of the test surface. The rate of change of the detector output signal is large for a high glass surface while the rate of change is low for a low gloss surface. For use of the instrument on curved as well as flat surfaces the chopper is provided with a plurality of blades spaced at different distances from the light source. The blade image which is more nearly focussed on the aperture will produce a larger rate of change in the detector signal and the signal with the largest rate of change is chosen as the one representative of the surface quality.
REFERENCES:
patent: 2720812 (1955-10-01), Middleton
patent: 2975285 (1961-03-01), Palmer
patent: 3551041 (1970-12-01), McGivern
Matsuta et al., "Development of a Gloss Tester for Paint Coatings", Japanese Journal of Applied Physics, vol. 21, No. 1, Jan. 1982, pp. 133-136.
General Motors Corporation
Hill Warren D.
Rosenberger R. A.
Vollero Michael F.
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