Non-contact sensor for determining moving flat steel strip shape

Electricity: measuring and testing – Conductor identification or location – Inaccessible

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324 61P, G01R 2726

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active

044764308

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.

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Okado et al., A New Shape Control Technique for Cold Strip Mills, paper presented at the Rolling Mill Conference of the Association of Iron & Steel Engineers in Cincinnati, Ohio, May 1981, pp. 1-31.
Kokan, NKK-Type Shape Meter for Steel Strip, pp. 1-32.

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