Optics: measuring and testing – By shade or color – With sequential comparison of sample and standard
Patent
1983-09-14
1986-02-11
Evans, F. L.
Optics: measuring and testing
By shade or color
With sequential comparison of sample and standard
356243, G01J 351, G01N 2127
Patent
active
045695946
ABSTRACT:
A sample to be measured, a black reference and at least one reference having a color similar to that of the sample are exposed successively and cyclicly to the same incident light beam, the light beams which are reflected successively by the sample and the references are detected photoelectrically, the ratio of the intensities of the light beams reflected by a sample and one reference color on the one hand and by the black reference and a reference color on the other hand is established electronically, the second ratio is subtracted electronically from the first and a difference which is directly proportional to the brilliance of the color of the sample is automatically obtained during each exposure or measurement cycle at a determined measurement frequency (FIG. 1).
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Cabi-Akman Robert
Simond Remy
Sprenger Arthur
Evans F. L.
Harringa Joel L.
Nestec S.A.
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