Method and apparatus for normalizing the outputs of sequentially

Details Method and apparatus for normalizing the outputs of sequentially Method and apparatus for normalizing the outputs of sequentially

1977-01-25

1978-05-02

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324235, 324263, G01R 3312

Patent

active

040877493

ABSTRACT:
A method and apparatus for detecting flaws in conduits or the like which prises positioning an annular array of Hall-effect devices transversely around the conduit, applying an electric current to the conduit to flow longitudinally therethrough so as to create a magnetic field around the conduit, sequentially scanning the Hall-effect devices to produce a series of output signals corresponding to the portions of the magnetic field sensed respectively by them, and comparing the output signals for nonuniformities among them, the nonuniformities being indicative of the existence and location of flaws.

REFERENCES:
patent: 1933547 (1933-11-01), Drake et al.
patent: 1998952 (1935-04-01), Edgar et al.
patent: 2295382 (1942-09-01), Brace
patent: 2770773 (1956-11-01), Cooley
patent: 3015063 (1961-12-01), Ownby
patent: 3247453 (1966-04-01), Quittner
patent: 3284701 (1966-11-01), Kerbow
patent: 3529236 (1970-09-01), Proctor

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