Analysis of complex differential eddy current transducer for deep flaws evaluation

In this paper, we propose a differential eddy current transducer dedicated for detecting and sizing deep surface flaws in thick materials. An analysis of the excitation parameters was carried out in order to obtain a good depth resolution of the transducer. Well-chosen parameters of the excitation a...

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Bibliographic Details
Published inNondestructive testing and evaluation Vol. 24; no. 1-2; pp. 61 - 68
Main Authors Chady, T., Baniukiewicz, P., Sikora, R.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Group 01.03.2009
Taylor & Francis Ltd
Subjects
Cracks
Defects
eddy current testing
Electric currents
Nondestructive testing
probe
search coils
Simulation
Transducers
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Summary:In this paper, we propose a differential eddy current transducer dedicated for detecting and sizing deep surface flaws in thick materials. An analysis of the excitation parameters was carried out in order to obtain a good depth resolution of the transducer. Well-chosen parameters of the excitation allow to obtain nearly linear dependence of the output signal amplitude on the flaw depth or high depth resolution of the transducer. The transducer can be calibrated to a particular defect depth and can be utilised in automatic defect classification or gap depth sizing. The results of numerical simulations as well as measurements are presented.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1058-9759
1477-2671
DOI:10.1080/10589750802195493