Affiliations: Instituto de Telecomunicações, Instituto Superior Técnico, Av. Rovisco Pais, Lisboa, Portugal
Correspondence:
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Corresponding author: Helena G. Ramos, Instituto de Telecomunicações, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. E-mail:[email protected]
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.
Keywords: ECT, eddy current testing, nondestructive evaluation, dilation invariance principle
