Rotating electromagnetic field defect detection system for tubular goods
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
Oct 6, 1999
filing date -
Oct 7, 1998
priority date (Note) -
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Abstract
The defect detection system of the present invention includes an encircling coil for providing a saturating DC magnetic fields to tubular goods. Also included is an encircling drive coil for applying a low level AC field using three-phase AC. Encircling pick up coils within the AC drive coils detect uniform, time varying magnetic fields to reveal defects within the tubular goods passing through the system.
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