Method and apparatus for measuring casing wall thickness using a

Details Method and apparatus for measuring casing wall thickness using a Method and apparatus for measuring casing wall thickness using a

1988-10-18

1989-06-27

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324229, 324262, G01B 710, G01R 3312, G01N 2772, G01N 2782

Patent

active

048433179

ABSTRACT:
A method and apparatus for measuring casing wall thickness using an axial main coil for generating a flux field enveloping the casing wall, and sensing actual field distribution by means of plural radial sensing coils each disposed at a radial position within the casing thereby to derive data sufficient to model a reference calibration for good casing wall structure; and, sensing flux leakage from the casing wall to detect anomalies of wall structure relative to the established reference calibration for output indication versus position along the casing.

REFERENCES:
patent: 2116119 (1938-05-01), Loewenstein
patent: 2194229 (1940-03-01), Johnston et al.
patent: 2315943 (1943-04-01), De Lanty
patent: 2971150 (1961-02-01), Prindle
patent: 3056920 (1962-10-01), Herrald
patent: 3284701 (1966-08-01), Kerbow
patent: 3417325 (1968-12-01), McCullough et al.
patent: 3597678 (1971-08-01), Fearon
patent: 4188577 (1980-02-01), Mhatre et al.
patent: 4292589 (1981-09-01), Bonner
patent: 4492115 (1965-01-01), Kahil et al.

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