Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 251, Issue -, Pages 66-74Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2016.10.003
Keywords
Electromagnetic sensors; Nondestructive testing; Pulsed eddy current; Liftoff point of intersection; Thickness measurement; Liftoff effect
Funding
- National Natural Science Foundation of China [51307172, 51677187, 51465024]
- Fundamental Research Funds for the Central Universities [2013QNA47]
- Six Talent Peaks Project in Jiangsu Province [ZBZZ-041]
- Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) [APCLI1404]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- China Jiangsu Provincial Department of Education
- China University of Mining and Technology
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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. (C) 2016 Published by Elsevier B.V.
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