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

doi:10.1109/TIM.2017.2728338

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

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Abstract

Lift-off variation causes errors in eddy current measurement of non-magnetic plates as well as magnetic plates. For non-magnetic 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 multi-frequency 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 lift-off can be reduced within 7.5%.

Original language	English
Pages (from-to)	167-174
Journal	IEEE Transactions on Instrumentation and Measurement
Volume	67
Issue number	1
Early online date	24 Oct 2017
DOIs	https://doi.org/10.1109/TIM.2017.2728338
Publication status	Published - 24 Oct 2017

Keywords

New compensation algorithm
eddy current testing
lift-off variation
magnetic plate

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10.1109/TIM.2017.2728338

1.Final version of manuscriptAccepted author manuscript, 351 KB
paper2Accepted author manuscript, 351 KB

Cite this

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

abstract = "Lift-off variation causes errors in eddy current measurement of non-magnetic plates as well as magnetic plates. For non-magnetic 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 multi-frequency 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 lift-off can be reduced within 7.5%.",

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AU - Lu, Mingyang

AU - Zhu, Wenqian

AU - Yin, Liyuan

AU - Peyton, Anthony J.

AU - Yin, Wuliang

AU - Qu, Zhigang

PY - 2017/10/24

Y1 - 2017/10/24

N2 - Lift-off variation causes errors in eddy current measurement of non-magnetic plates as well as magnetic plates. For non-magnetic 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 multi-frequency 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 lift-off can be reduced within 7.5%.

AB - Lift-off variation causes errors in eddy current measurement of non-magnetic plates as well as magnetic plates. For non-magnetic 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 multi-frequency 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 lift-off can be reduced within 7.5%.

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

Abstract

Keywords

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Electromagnetic Sensing Group

Electromagnetic Tensor Imaging for in Process Welding Inspection

Cite this

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Electromagnetic Sensing Group

Electromagnetic Tensor Imaging for in Process Welding Inspection

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