Optics: measuring and testing – Of light reflection
Patent
1989-12-21
1992-05-05
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
356243, 250562, 131908, 209535, G01N 2155
Patent
active
051102137
ABSTRACT:
A method and apparatus for nondestructively, quickly and accurately measuring concentration of a material in a sample, for example carbon concentration in a carbon-containing sheet, by optically sensing a two-dimensional portion of the carbon-containing sheet and converting the sensed portion into a two-dimensional array of points, each having a digital value related to the sensed optical intensity at the point. Preferably, each point has a gray scale value of the sensed optical intensity at the point. An average digital gray scale value for the two-dimensional gray scale array of points is obtained and compared to the average digital gray scale value of a carbon-free sheet to obtain an optical density. The obtained optical density correlates highly with the carbon concentration, as measured by chemical concentration measurement techniques which are slow and destructive.
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Keesee LaCharles P.
McGraw Vincent P.
Myers Grover M.
R. J. Reynolds Tobacco Company
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