Optics: measuring and testing – By shade or color
Patent
1996-12-02
1998-08-25
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
356405, 356446, G01N 2127, G01N 2149
Patent
active
057988390
ABSTRACT:
The apparatus for determining the color stimulus specification of translucent objects comprises two light sources to create on the surface of an object under test two light spots which have different size. The light is transmitted from the light sources to the object under test by means of an optically conducting fiber bundle. The light reflected by the object under test is received by a lens and led via an optically conducting fiber bundle to a spectrometer. Thereafter, the measurement signal is digitized and arithmetically evaluated in a microprocessor. Due to the fact that two differently sized light spots are used, the measurement error which results in determining the color specification value of a translucent object can be defined and corrected. For this purpose, use is made of reference measurement values which have been obtained by measuring opaque reference objects and which have been stored in a memory module of the apparatus. In order to eliminate the influence of the disturbing ambient light, a further measurement without any light spot can be performed.
REFERENCES:
patent: 5428450 (1995-06-01), Vieillefosse et al.
patent: 5471311 (1995-11-01), Van Den Bergh et al.
Berner Markus
Gobbetti Carlo
McGraw Vincent P.
MHT Optic Research AG
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