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Detection of Cracks by Eddy Current Testing Based on Dilation Invariance Principle

Ramos, H. ; Baskaran, P. ; Ribeiro, A. L.

Detection of Cracks by Eddy Current Testing Based on Dilation Invariance Principle, Proc International Symposium on Applied Electromagnetics and Mechanics ISEM, Awaji, Japan, Vol. USB, pp. 00 - 00, September, 2015.

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Abstract
The objective of this paper is a proof of concept on the possibility to measure the same magnetic fields, by the principle of dilation invariance. According to this principle, dilation of the dimensional and electrical parameters of a probe and a plate with crack reproduces the same magnetic field (measured at every dilated point) which was produced by a probe and a plate with crack, without dilation. This implies that, in order to evaluate the performance of eddy current method in a specific industrial case study, one can carry out tests in a scaled model in the laboratory and then, extend the conclusions to the real situation by using dilation invariance principle. The experimental and simulation results show a good agreement of crack detection by using two eddy current probes of which one is the dilated version of the other.