Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1992-11-09
1995-07-18
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324233, 324262, G01N 2782, G01R 3312
Patent
active
054345065
ABSTRACT:
Defects such as corrosion located on a covered metal component are detected through Eddy current inspection using stationary magnetic fields and scanning sensors arrays. A magnetizing yoke is held fixed to the cover of the component and a magnetic flux sensor is used to scan the area between the legs of the yoke over the cover of the component. Also, a fixed array of sensors can be provided between the legs of the yoke for automatic multiplexing of the sensors and sampling in sequence of signal responses picked up by sensors in the sensor array. Additionally, a stationary magnetic field arrangement is provided by a plurality of probes aligned adjacent and parallel with each other. A fixed array of magnetic flux sensors are arranged between the legs of the aligned probes for scanning for defects. This arrangement of fixed sesnsors can be used for underwater use and sealed by a sealing compound. An attachment means can be used for holding the arrangement stationary with respect to the surface of a submerged component during sampling of the signal responses.
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Edwards Robert J.
Kalka Daniel S.
O'Shea Sandra L.
Patidar J. M.
The Babcock & Wilcox Company
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