Eddy-current flaw detection method and apparatus
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United States of America Patent
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Oct 16, 2012
Grant Date -
Mar 24, 2011
app pub date -
May 1, 2008
filing date -
Nov 21, 2006
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Abstract
A method of eddy-current flaw detexction where an exciting device and a receiving device are held in the vicinity of a conductor. An eddy current is generated in the conductor by a primary magnetic field generated by excitation, thereby generating a secondary magnetic field, wherein the state of the magnetic field is detected by the receiving device. The exciting device includes a coil and an iron core. The coil has a first current line and a second current line in which electric current flows in opposite directions. The iron core is gate-shaped in cross section and includes a first leg portion, a second leg portion, and a beam portion. The receiving device is disposed in a corner between the second leg portion and the conductor, on a side opposite the second current line on the outer side of the iron core.
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