Eddy current hybrid probe with movable magnetic field altering m

Details Eddy current hybrid probe with movable magnetic field altering m Eddy current hybrid probe with movable magnetic field altering m

1997-05-16

1999-07-20

Strecker, Gerard

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, 324232, 324262, G01N 2790

Patent

active

059260203

ABSTRACT:
The eddy current probe for non-destructive testing of a conductive elongated member includes an oscillating magnetic field generator for producing a magnetic field directed towards a cross-sectional peripheral surface of the elongated member. The magnetic field generator includes a pair of coils arranged to be spaced apart along the elongated member to produce an enhanced combined magnetic field component perpendicular to the cross-sectional peripheral surface in a space between the coils and a reduced magnetic field component lengthwise along the elongated member. A ferromagnetic member is movably mounted for altering the magnetic field at points along the cross-sectional peripheral surface provided between the coils. A detecting and analyzing system measures an impedance of the coils as the generator is moved along the elongated member and as the field altering member is moved over the peripheral surface. An enhanced signal is obtained.

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patent: 5424640 (1995-06-01), Levy

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