Rotating concave eddy current probe

Details Rotating concave eddy current probe Rotating concave eddy current probe

2008-04-01

2008-04-01

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S242000, C324S228000

Reexamination Certificate

active

07352176

ABSTRACT:
A rotating concave eddy current probe for detecting fatigue cracks hidden from view underneath the head of a raised head fastener, such as a buttonhead-type rivet, used to join together structural skins, such as aluminum aircraft skins. The probe has a recessed concave dimple in its bottom surface that closely conforms to the shape of the raised head. The concave dimple holds the probe in good alignment on top of the rivet while the probe is rotated around the rivet's centerline. One or more magnetic coils are rigidly embedded within the probe's cylindrical body, which is made of a non-conducting material. This design overcomes the inspection impediment associated with widely varying conductivity in fastened joints.

REFERENCES:
patent: 5399968 (1995-03-01), Sheppard et al.
patent: 6014024 (2000-01-01), Hockey et al.
patent: 6636037 (2003-10-01), Ou-Yang
patent: 7301335 (2007-11-01), Sun et al.
patent: 2273782 (1994-06-01), None
patent: 411148876 (1999-06-01), None
patent: WO 2007/015705 (2000-02-01), None

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