Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1995-04-19
1996-04-23
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324241, 324249, 324225, 324235, G01N 2782
Patent
active
055107095
ABSTRACT:
An eddy current surface inspection array probe and method for detecting cracks and flaws in aircraft skin metal immediately surrounding rivets, without requiring rivet removal or manual scanning. The array probe includes a circular array of small sense coils positioned beneath a much larger drive coil encased in ferrite. The sense coils are differentially connected in pairs such that the signals from two sense coils located on opposite sides of the rivet (180.degree. apart) subtract to produce a resultant output signal. During operation, the probe is positioned concentrically over the rivet and data acquired from all sense coil pairs. If no cracks or other defects are present, all sense coil pairs produce a null (zero) signal. If a crack exists, some sense coil pairs (the exact number depending on the crack length, number of sense coils, and sense coil spacing) produce a non-zero signal. The probe and method can be employed to inspect a variety of other structural features which are nominally circularly symmetrical.
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Gilmore Robert S.
Hurley Donna C.
Young John D.
General Electric Company
Khosravi Kourosh Cyrus
Webb II Paul R.
Wieder Kenneth A.
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