Harold L. Schenk - Monroeville PA Warren R. Junker - Monroeville PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
G01B 710 G01R 3312
US Classification:
324230
Abstract:
An eddy current thickness probe for measuring the thickness of a weakly ferromagnetic material layer on a ferromagnetic base is provided with an essentially constant magnetic field bias. The magnetic field bias is of sufficient strength to substantially saturate ferromagnetic constituents in the weakly ferromagnetic layer. This eliminates any effects of changes in permeability of the weakly ferromagnetic layer which would otherwise impair the operation of an eddy current thickness gauge.