Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1995-09-13
1999-08-24
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324240, G01N 2772, G01R 3312
Patent
active
059428945
ABSTRACT:
A radially focused eddy current sensor detects longitudinal flaws in a metal tube. A drive coil induces eddy currents within the wall of the metal tube. A pick-up coil is spaced apart from the drive coil along the length of the metal tube. The pick-up coil is positioned with one end thereof lying adjacent the wall of the metal tube such that the pick-up coil's longitudinal axis is perpendicular to the wall of the metal tube. To isolate the pick-up coil from the magnetic flux of the drive coil and the flux from the induced eddy currents, except the eddy currents diverted by a longitudinal flaw, an electrically conducting material high in magnetic permeability surrounds all of the pick-up coil except its one end that is adjacent the walls of the metal tube. The electrically conducting material can extend into and through the drive coil in a coaxial relationship therewith.
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Fulton James P.
Namkung Min
Nath Shridhar C.
Simpson John W.
Todhunter Ronald G.
Edwards Robin W
Snow Walter E.
The United States of America as represented by the Administrator
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