publication . Article . Preprint . 2017

Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data

Mingyang Lu; Wenqian Zhu; Liyuan Yin; Anthony J. Peyton; Wuliang Yin; Zhigang Qu;
  • Published: 01 Jan 2017
  • Country: Switzerland
Abstract
<p>Lift-off variation causes errors in eddy current measurement of nonmagnetic plates as well as magnetic plates. For nonmagnetic plates, previous work has been carried out to address the issue. In this paper, we follow a similar strategy, but try to reduce the lift-off effect on another index--zero-crossing frequency for magnetic plates. This modified index, termed as the compensated zero-crossing frequency, can be obtained from the measured multifrequency inductance spectral data using the algorithm we developed in this paper. Since the zero-crossing frequency can be compensated, the permeability of magnetic plates can finally be predicted by deriving the rela...
Subjects
free text keywords: Eddy current testing, Eddy currents, Frequency measurement, Impedance, Inductance, lift-off variation, magnetic plate, new compensation algorithm, Permeability, Permeability measurement, permeability measurement., /dk/atira/pure/subjectarea/asjc/3100/3105, Instrumentation, /dk/atira/pure/subjectarea/asjc/2200/2208, Electrical and Electronic Engineering, Lift (force), Electrical impedance, Permeability (electromagnetism), Mathematics, Eddy-current testing, Spectral data, Electronic engineering, Eddy current, law.invention, law, Electrical Engineering and Systems Science - Signal Processing
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