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Lookup NU author(s): Dr Mengbao Fan, Dr Binghua Cao, Professor Gui Yun TianORCiD, Dr Wei Li
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Pulsed eddy current (PEC) responses would intersect at a point for a nonferrous plate when only liftoff distance is varied. In this paper, the behaviors of liftoff point of intersection (LOI) points due to a plate with varying conductivity and thickness were investigated and interpreted in physics by means of simulations and experiments. LOI points result from the invariance of the phase spectrum of PEC responses to liftoff effect, and the time of LOI points would increase with an increase of phase spectrum. Subsequently, the signatures of LOI points were compared with the peak heights and time to peaks of PEC signals and their derivatives. The results demonstrate that the signatures of LOI points possess the comparable performances in terms of sensitivity, linearity and measurement range. Moreover, the signatures of LOI points are immune to liftoff variations in nature, which shall enhance the accuracy and reliability of PEC evaluation.
Author(s): Fan MB, Cao BH, Tian GY, Ye B, Li W
Publication type: Article
Publication status: Published
Journal: Sensors and Actuators A: Physical
Year: 2016
Volume: 251
Pages: 66-74
Print publication date: 01/11/2016
Online publication date: 06/10/2016
Acceptance date: 04/10/2016
ISSN (print): 0924-4247
Publisher: Elsevier Science
URL: . http://dx.doi.org/10.1016/j.sna.2016.10.003
DOI: 10.1016/j.sna.2016.10.003
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