Magnetic testing device for internal surfaces of pipe using a ma

Details Magnetic testing device for internal surfaces of pipe using a ma Magnetic testing device for internal surfaces of pipe using a ma

1977-03-07

1977-12-13

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Magnetic recording medium on magnetized object records...

324220, 361142, G01R 3312

Patent

active

040631575

ABSTRACT:
A magnetic testing device is provided in which a magnetic recording tape or paper is wrapped around the outside of a tubular pressure member of elastomeric material which is disposed between two circular end plates which form pole portions of a yoke having a central core extending between the end plates and having a coil wound thereon with a copper shield being disposed around the outside of the coil. The device is disposed in a pipe or the like and compressed air is supplied to inflate the pressure member and press the magnetic tape paper into intimate contact with the interior surface of the pipe while an AC current is supplied to the coil to apply a magnetic field to the pipe and to record a magnetic field pattern on the magnetic tape or paper.

REFERENCES:
patent: 2124579 (1938-07-01), Knerr et al.
patent: 2622125 (1952-12-01), Bender
patent: 2764733 (1956-09-01), De Forest
patent: 2958037 (1960-10-01), Riede et al.
patent: 2979655 (1961-04-01), De Forest
patent: 3225293 (1965-12-01), Wood et al.

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