Apparatus for detecting surface flaw of pipeline by electromagne

Details Apparatus for detecting surface flaw of pipeline by electromagne Apparatus for detecting surface flaw of pipeline by electromagne

1986-09-16

1988-05-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324225, 324242, G01N 2782, G01R 3312

Patent

active

047422980

ABSTRACT:
An apparatus for detecting a surface flaw of each pipe constituting a pipeline, including a pig capable of travelling along pipeline and being provided with the following elements: a cylindrical primary coil coaxial with the pipe, the density of a magnetic flux of an AC magnetic field of the primary coil varying in response to an inner surface flaw of the pipe; a plurality of cylindrical secondary coils arranged at prescribed intervals in the circumferential direction of the pipe between a peripheral surface of the primary coil and a confronting peripheral surface of the pipe, each secondary coil having an axis parallel to the axis of the primary coil, and producing an AC voltage proportional to the density of a component parallel to the axis of each secondary coil, of the magnetic flux of the AC magnetic field of the primary coil; and a signal processing circuit for processing the AC voltage signals from the secondary coils to detect the presence and the depth of a surface flaw of the pipe.

REFERENCES:
patent: 2124579 (1938-07-01), Knerr et al.
patent: 2555853 (1951-06-01), Irwin
patent: 3593122 (1971-07-01), Barton
patent: 3597678 (1971-08-01), Fearon
patent: 4105972 (1978-08-01), Smith
patent: 4649343 (1987-03-01), Birchak et al.

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