Eddy current flaw detector having rotatable field defining sleeve for selectively enhancing induced eddy currents in a workpiece
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United States of America Patent
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Jun 16, 1987
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N/A
app pub date -
Jun 27, 1984
filing date -
Jun 27, 1984
priority date (Note) -
Expired
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Abstract
Method and apparatus for scanning a generally cylindrical workpiece for flaws. A cylindrical metallic sleeve is rotatably supported about a workpiece path of travel. Two differentially wound energization coils surround the sleeve near two apertures in the sleeve. The coils are energized with a high frequency signal that induces eddy currents in the workpiece. The apertures periodically disrupt the eddy current inducing magnetic fields and enhances signals from the coils indicative of the presence of flaws in the workpiece.
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