Eddy current surface inspection probe for aircraft fastener insp

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material

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324241, 324249, 324225, 324235, G01N 2782

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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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"Probe-Flaw Interactions with Eddy Current Array Probes", Bert A. Auld, Review of Progress In Quantitative NDE 10, edited by D. O. Thompson and D. E. Chimenti (Plenum Press, N.Y., 1988), pp. 951-955.
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"Detecting Second-Layer Fatigue Cracks Under Installed Skins and Fasteners with Low-Frequency Eddy Current Array", Brian Hill et al., The American Society for Nondestructive Testing, Inc., Materials Evaluation, Dec. 1992.

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