Principles of eddy-current distance gauges
- 1 January 1977
- journal article
- Published by Institution of Engineering and Technology (IET) in Proceedings of the Institution of Electrical Engineers
- Vol. 124 (5) , 479-484
- https://doi.org/10.1049/piee.1977.0093
Abstract
The field theory of an a.c. loop over a metal surface is reviewed and expressions are derived which demonstrate the possibility of a method of distance gauging, in which the effects of conductivity and permeability of the metal can be compensated. The residual interaction then approaches that of a perfect image of the loop reflected in the surface. Some experimental gauges are described and their measured performance is presented, confirming the validity of the method.Keywords
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