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:
Oct. 09, 1984
Filed:
Apr. 05, 1982
Wade S Wright, Fairfield, OH (US);
John T Voisine, Middletown, OH (US);
Glenn S Huppi, West Chester, OH (US);
Other;
Abstract
Method and apparatus for monitoring the flatness characteristic of a moving electrically conducting strip of material by continuously measuring the change in capacitance between the strip surface and a fixed point adjacent the surface. The capacitance is measured by means of a sensor having an active plate surrounded by a guard plate for eliminating stray capacitance, both plates being impressed with a high frequency signal. Changes in capacitance associated with both plates are eliminated while changes in capacitance associated with only the active plate are covered to a voltage proportional to the inverse of the spacing between the active plate and the strip surface. A plurality of the sensors may be spaced across the width of the plate for providing a profile of the strip flatness characteristics. The sensor finds particular application for monitoring and characterizing bottom buckles in steel strip following high temperature annealing.