Open AccessAnalytical model for probe impedance using reflection and transmission theory in eddy current testing
Author(s) -
Fan Meng-Bao,
Pingjie Huang,
Bo Ye,
Dibo Hou,
Guangxin Zhang,
Zhou Ze-kui
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.5950
Subject(s) - eddy current , electrical impedance , reflection (computer programming) , physics , excitation , electromagnetic field , series (stratigraphy) , field (mathematics) , computational physics , acoustics , optics , mechanics , computer science , mathematics , geology , paleontology , quantum mechanics , pure mathematics , programming language
The analytical model of probe impedance due to multilayered conductive structures is established using the reflection and transmission theory of electromagnetic waves in eddy current testing. The electromagnetic field in the region under considecation consists of the excitation field of the coil and the eddy current field. The eddy current field is regarded as the combination of the reflection and transmission of the excitation field. Therefore, the probe impedance is analytically modeled by applying the series-form representation of the excitation field and the reflection and transmission theory of electromagnetic waves, thus resulting in a series-form expression. Finally, the calculated results from the typical integral-form and developed series-form expressions were compared, and experiments were carried out. The good agreement between the calculated and experimental results justifies the presented analytical model. In comparison with the infinite integral of probe impedance, the series-form expansion has advantages of not needing the determination of the integral upper limit, saving time and easy control of the error.