Eddy current probe impedance due to a flaw : The influence of phase-shifted fields

An approximate formula for the change in impedance of an eddy current two-coil probe situated above a conducting medium with a volumetric flaw is derived in this paper. The primary field is generated by the superposition of two phase-shifted alternating currents of the same frequency. The Lorentz re...

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Bibliographic Details
Published in:Journal of nondestructive evaluation 1998-06, Vol.17 (2), p.47-52
Main Authors: DERUN, E. N, KOLYSHKIN, A. A, VAILLANCOURT, R
Format: Article
Language:English
Subjects:
Analysing. Testing. Standards
Applied sciences
Cross-disciplinary physics: materials science
rheology
Eddy current testing
Eddy currents
Exact sciences and technology
Impedance
Materials science
Materials testing
Metals. Metallurgy
Nondestructive testing
Nondestructive testing: electromagnetic testing, eddy-current testing
Physics
Reciprocity
Reciprocity theorem
Testing for defects
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Description
Summary:An approximate formula for the change in impedance of an eddy current two-coil probe situated above a conducting medium with a volumetric flaw is derived in this paper. The primary field is generated by the superposition of two phase-shifted alternating currents of the same frequency. The Lorentz reciprocity theorem and a layer approximation are used to obtain the change in impedance. Numerical results for different values of the phase difference are presented. These results can be used for developing more selective eddy current testing methods.
ISSN:0195-9298
1573-4862
DOI:10.1007/BF02995482