Method and apparatus for detecting concavo-convex shape surface defects
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United States of America Patent
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Jun 18, 2013
Grant Date -
Jan 6, 2011
app pub date -
Aug 20, 2008
filing date -
Aug 23, 2007
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Abstract
A detection method for detecting a concavo-convex shape surface defect existing on a ferromagnetic metal object including sensing a signal attributed to strain of the concavo-convex shape surface defect having a size in a range of 0.5 to 6 μm. The signal is magnetic flux leaking from the ferromagnetic metal to which magnetic flux is applied. A detecting apparatus incorporates a magnetizer for magnetizing a ferromagnetic metal and a plurality of magnetic sensors arranged in the direction perpendicular to a traveling direction of the ferromagnetic metal to sense a signal attributed to strain of a concavo-convex shape surface defect having a size in a range of 0.5 to 6 μm.
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