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

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-cro...

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Veröffentlicht in:IEEE transactions on instrumentation and measurement 2018-01, Vol.67 (1), p.167-174
Hauptverfasser: Mingyang Lu, Wenqian Zhu, Liyuan Yin, Peyton, Anthony J., Wuliang Yin, Zhigang Qu
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container_issue 1
container_start_page 167
container_title IEEE transactions on instrumentation and measurement
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creator Mingyang Lu
Wenqian Zhu
Liyuan Yin
Peyton, Anthony J.
Wuliang Yin
Zhigang Qu
description 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 relation between the permeability and zero-crossing frequency from Dodd and Deeds method. We have derived the method through mathematical manipulation and verified it by both simulation and experimental data. The permeability error caused by liftoff can be reduced within 7.5%.
doi_str_mv 10.1109/TIM.2017.2728338
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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 relation between the permeability and zero-crossing frequency from Dodd and Deeds method. We have derived the method through mathematical manipulation and verified it by both simulation and experimental data. 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subjects Algorithms
Computer simulation
Eddy current testing
Eddy currents
Frequency measurement
Impedance
Inductance
Lift
lift-off variation
Liftoff
Magnetic induction
Magnetic permeability
magnetic plate
new compensation algorithm
Permeability
Permeability measurement
Plates
title Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data
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