Tube inspection probe with rotating eddy current coil

Details Tube inspection probe with rotating eddy current coil Tube inspection probe with rotating eddy current coil

1983-12-07

1986-11-25

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

33302, G01N 2790, G01R 3312

Patent

active

046251650

ABSTRACT:
An electro-mechanical eddy current probe having a rotatable sensing head for sensing the wall thickness of and locating local defects in a tube or conduit through which it is passed. The rotatable head includes a radially movable, outward projecting sensing member which is spring-biased into engagement with the interior surface of the tube and which carries an eddy current coil electrically monitored by the probe. The cylindrical probe is centered within the tube by a pair of centering guides at either of its ends. The probe also carries a fixed eddy current coil on its non-rotating body portion for detecting and anticipating locations of particular interest within the tube where the longitudinal movement of the probe should be slowed, such as locations of exterior tube support plates where denting is more apt to occur.

REFERENCES:
patent: 2684464 (1954-07-01), Hastings et al.
patent: 3035353 (1962-05-01), Hovemeyer et al.
patent: 3088068 (1963-04-01), Hall et al.
patent: 3163487 (1964-12-01), Buck
patent: 3238448 (1966-03-01), Wood et al.
patent: 3267366 (1966-08-01), Bricaud
patent: 3419797 (1968-12-01), Libby
patent: 4087748 (1978-05-01), Pigeon et al.
patent: 4134067 (1979-01-01), Woodbury
patent: 4182985 (1980-01-01), DeWolfe et al.
patent: 4341113 (1982-07-01), Gutzwiller
patent: 4441078 (1984-04-01), LeComte

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