Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1975-07-28
1978-05-09
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324232, 324235, G01R 3312
Patent
active
040889467
ABSTRACT:
A transducer for identifying and quantitatively measuring the presence and location of ferromagnetic material, which is specifically suitable for remotely mapping ferromagnetic deposits on pressurized water reactor steam generator tubing. The transducer employs a first source of a magnetic field which is positionable in magnetic communication with and is mounted to be movable over the surface area of the workpiece. Perturbations produced in the magnetic field as a result of ferromagnetic discontinuities associated with the workpiece are sensed by a Hall element fixedly positioned with respect to the source in magnetic communication with the workpiece. Means are provided for altering the magnetic field of the source in communication with the Hall element to substantially null the output of the Hall element in the absence of magnetic material within or on the workpiece within proximity of the Hall element.
REFERENCES:
patent: 2897438 (1959-07-01), Fearon
patent: 3060370 (1962-10-01), Varterasian
patent: 3340467 (1967-09-01), Ha
patent: 3676828 (1972-07-01), Masuda et al.
Charles Robert G.
Lindsay, Jr. William T.
Abeles D. C.
Corcoran Robert J.
Dermer Z. L.
Westinghouse Electric Corp.
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