Patent ID: 6580262
Filing Date: 2003-06-17
Classification: B65H,G01B,G01D

Abstract:
A method for inductively measuring the position of a longitudinally moving metal strip, in which, at least on one side of the strip, a primary coil fed by AC voltage is arranged adjacent said one side of a strip edge and a secondary coil is arranged adjacent the corresponding opposite side of said strip edge, with said metal strip between said primary and secondary coils, which secondary coil measures the voltage which is induced by the primary coil and results from the coupling effect with the primary coil and said metal strip situated there-between, in which, as a result of voltage measurement at two different lateral positions because of lateral relative movement between said strip and said coils, a measurement gradient is obtained as a result, and can be determined and compared with a predetermined optimum measurement gradient, whereupon, in the event of a difference, the measurement gradient that has been ascertained is matched by electronic means to said predetermined optimum measurement gradient and the adapted values thereby obtained are applied to maintain strip movement control.