Method and apparatus for determining the amount of magnetic debr

Details Method and apparatus for determining the amount of magnetic debr Method and apparatus for determining the amount of magnetic debr

1985-01-10

1987-10-13

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324202, 324232, G01N 2772, G01N 2782, G01R 3312, G01R 3500

Patent

active

047001348

ABSTRACT:
A method and apparatus for magnetically measuring the amount and location of magnetite (Fe.sub.3 O.sub.4) debris adhering to the exterior of heat exchanger tubes which can be made of Inconel. A probe containing one or more coils of electrical wire is used to traverse the interior of the subject tube. One of the probe coils is energized with direct electric current to magnetize the magnetite coating on the tube exterior as the probe traverses the tube. The thickness of the magnetized coating is deduced from measurement of the voltage generated across a second coil of wire on a probe which traverses the tube at constant velocity.

REFERENCES:
patent: 2677802 (1954-05-01), Irwin
patent: 3532969 (1970-10-01), McCullough et al.
patent: 4088946 (1978-05-01), Charles et al.
Lord et al., "Magnetic Probe Inspection of Steam Generator Tubing", Materials Evaluation, May 1980, pp. 838-840.

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