Non-contact sensor for determining moving flat steel strip shape profile
Patent 4476430 Issued on October 9, 1984. Estimated Expiration Date: 
April 5, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 5, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2950436 3042861 3161824 3471780 3502968 3523246 3764899 3771051 3781672 Strip center line sensor Patent #: 4287471 InventorsApplicationNo. 06/365791 filed on 04/05/1982US Classes:324/671, To determine dimension (e.g., dielectric thickness)324/611, Including a remote type circuit324/688, Including a guard or ground electrode73/105RoughnessExaminersPrimary: Krawczewicz, Stanley T.International ClassesB21B 38/00 (20060101)B21B 38/02 (20060101) G01B 7/28 (20060101) G01B 7/287 (20060101) G01B 7/02 (20060101) AbstractMethod 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.Other References
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