Method and apparatus for electro-magnetically testing elongated

Details Method and apparatus for electro-magnetically testing elongated Method and apparatus for electro-magnetically testing elongated

1994-07-22

1997-06-10

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01N 2790

Patent

active

056380003

ABSTRACT:
A method and apparatus for electro-magnetically testing surface regions of elongated test objects for irregularities, such as flaws, and which is particularly suitable for testing test objects with non-circular or elliptical cross sections. Testing is performed by at least one coil, particularly an eddy current coil, through which a test object passes. The test coil has a coil plane passage of predetermined cross-section, and a modification of the passage cross-section of the test coil can be obtained by tilting the test coil. The test coil can optionally be rotated about an axis defined by the travel direction of the test object, and may also be moved in directions perpendicular to the travel direction. A disclosed apparatus for performing the method has several tiltable and rotatable and/or slidable test coils which are successfully arranged in the travel direction in the form of a coil group.

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