The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1992
Filed:
Dec. 21, 1989
Sydney K Seymour, Clemmons, NC (US);
R. J. Reynolds Tobacco Company, Winston-Salem, NC (US);
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.