G - Physics – 01 – B
Patent
G - Physics
01
B
33/169
G01B 5/00 (2006.01) B21B 38/02 (2006.01) G01B 5/04 (2006.01) G01B 7/02 (2006.01) G01B 7/287 (2006.01)
Patent
CA 1201584
NON-CONTACT SENSOR FOR DETERMINING MOVING FLAT STEEL STRIP SHAPE PROFILE ABSTRACT OF THE DISCLOSURE 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 (1) having an active plate (7) surrounded by a guard plate (2) for eliminating stray capacitance, both plates (2, 7) 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 converted to a voltage proportional to the inverse of the spacing between the active plate and the strip surface. A plurality of the sensors (1) may be spaced across the width of the plate (7) 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.
425026
Huppi Glenn S.
Voisine John T.
Wright Wade S.
Armco Inc.
Smart & Biggar
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