Electricity: measuring and testing – Magnetic – By paramagnetic particles
Patent
1987-12-28
1989-08-22
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
By paramagnetic particles
324228, G01N 2784, G01N 2790, G01R 3312
Patent
active
048599433
ABSTRACT:
A method for inspecting the surface of a workpiece for the presence of flaws using a ferrofluid as a penetrant which is applied to the surface of the workpiece and then scanning the surface of the workpiece with electrical detection means placed adjacent to the surface for providing responses indicative of the presence of flaws in the surface of the workpiece. If desired, a magnetic field can be used to induce the flow of the ferrofluid into any flaws prior to inspection, and for post-inspection cleanup as well. By the use of a ferrofluid, the sensitivity of the electrical detection means, advantageously of the eddy current type, is enhanced in typical applications, and also allows the use of an eddy current probe to inspect workpieces made of nonconductive and/or nonferromagnetic materials.
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Alston et al; Colloidal Solution of Fe.sub.3 O.sub.4 for Locating Magnetic Defects; IBM Tech. Discl. Bull., vol. 22, No. 8B, Jan. 1980, p. 3800.
Evans Robert S.
Latham Wayne M.
Powers Thomas
Robertson Michael O.
Edwards Robert J.
Marich Eric
Matas Vytas R.
Strecker Gerard R.
The Babcock & Wilcox Company
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