Electromagnetic induction inspection apparatus and method employ

Details Electromagnetic induction inspection apparatus and method employ Electromagnetic induction inspection apparatus and method employ

1992-11-23

1996-08-20

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324228, G01N 2782

Patent

active

055482147

ABSTRACT:
An electromotive induction current which is detected by an induction coil placed in an electromagnetic field generated by applying an alternating current to an exciting coil distinctively changes with the frequency of the applied alternating current in accordance with the conditions of an object placed in the electromagnetic field. By analyzing the change in amplitude and/or frequency phase of the electromotive induction current, the physical properties, size and relative position of the object and internal defects such as a crack and pin hole in the object can be measured precisely.

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patent: 3686564 (1972-08-01), Mallick, Jr. et al.
patent: 4079312 (1978-03-01), Osborn et al.
patent: 4563644 (1986-01-01), Lenander et al.
patent: 4563645 (1986-01-01), Kerr
patent: 4818936 (1989-04-01), Kemlo
patent: 5017869 (1991-05-01), Oliver

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