Method of and apparatus for contactless planarity measurements on ferromagnetic metal strip
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United States of America Patent
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Sep 10, 2002
Grant Date -
Jul 12, 2001
app pub date -
Jan 11, 2001
filing date -
Jan 12, 2000
priority date (Note) -
Expired
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Abstract
A method and apparatus for the contactless determination of planarity and a ferromagnetic metal strip during transit of the strip through a strip-processing line or cold-rolling line. Hysteresis loops repetitively impressed in the metal strip and the tangential magnetic field strength is measured at a surface thereof and electromagnetic parameters are determined from the time course of the tangential field strength signal. The parameters are functions of the mechanical stress which is evaluated to determine residual intrinsic stress distribution and then the planarity or nonplanarity of the strip.
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