Inversion of Distance and Magnetic Permeability Based on Material-Independent and Liftoff Insensitive Algorithms Using Eddy Current Sensor

Mingyang Lu; Xiaobai Meng; Ruochen Huang; Liming Chen; Anthony Peyton; Wuliang Yin

doi:10.1109/TIM.2020.3036099

Inversion of Distance and Magnetic Permeability Based on Material-Independent and Liftoff Insensitive Algorithms Using Eddy Current Sensor

Mingyang Lu^*, Xiaobai Meng, Ruochen Huang, Liming Chen, Anthony Peyton, Wuliang Yin

^*Corresponding author for this work

The University of Northampton

Research output: Contribution to journal › Article › peer-review

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Abstract

Eddy current sensors can be used to test the characteristics and measure the parameters of the conductive samples. As the main obstacle of the multifrequency eddy current (MEC) sensor, the liftoff distance affects the effectiveness and accuracy of the measurement. In this article, a material-independent algorithm has been proposed for the restoration of the liftoff distance when using the MEC sensor, which is based on the approximation under the thin-skin effect. Experiment testing on the performance of the proposed method is presented. The results show that from the dual-frequency inductance, the liftoff distance could be restored with a maximum error of 0.24 mm for the distance up to 12 mm. Besides, the derived liftoff distance is used for the inversion of the magnetic permeability. Based on a liftoff insensitive inductance (LII) feature, the magnetic permeability of steels can be inversed in an iterative manner, with an error of less than 0.6 % for the liftoff distance up to 12 mm.

Original language	English
Article number	9249032
Journal	IEEE Transactions on Instrumentation and Measurement
Volume	70
Early online date	5 Nov 2020
DOIs	https://doi.org/10.1109/TIM.2020.3036099
Publication status	Published - 2021

Keywords

Eddy current
liftoff
material independent
nondestructive testing (NDT)
permeability measurement

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10.1109/TIM.2020.3036099

Inversion of distance and magnetic permeability based on material-independent and lift-off insensitive algorithms using eddy current sensorAccepted author manuscript, 1.66 MB

Cite this

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title = "Inversion of Distance and Magnetic Permeability Based on Material-Independent and Liftoff Insensitive Algorithms Using Eddy Current Sensor",

abstract = "Eddy current sensors can be used to test the characteristics and measure the parameters of the conductive samples. As the main obstacle of the multifrequency eddy current (MEC) sensor, the liftoff distance affects the effectiveness and accuracy of the measurement. In this article, a material-independent algorithm has been proposed for the restoration of the liftoff distance when using the MEC sensor, which is based on the approximation under the thin-skin effect. Experiment testing on the performance of the proposed method is presented. The results show that from the dual-frequency inductance, the liftoff distance could be restored with a maximum error of 0.24 mm for the distance up to 12 mm. Besides, the derived liftoff distance is used for the inversion of the magnetic permeability. Based on a liftoff insensitive inductance (LII) feature, the magnetic permeability of steels can be inversed in an iterative manner, with an error of less than 0.6 % for the liftoff distance up to 12 mm.",

keywords = "Eddy current, liftoff, material independent, nondestructive testing (NDT), permeability measurement",

author = "Mingyang Lu and Xiaobai Meng and Ruochen Huang and Liming Chen and Anthony Peyton and Wuliang Yin",

note = "Publisher Copyright: {\textcopyright} 1963-2012 IEEE.",

year = "2021",

doi = "10.1109/TIM.2020.3036099",

language = "English",

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T1 - Inversion of Distance and Magnetic Permeability Based on Material-Independent and Liftoff Insensitive Algorithms Using Eddy Current Sensor

AU - Lu, Mingyang

AU - Meng, Xiaobai

AU - Huang, Ruochen

AU - Chen, Liming

AU - Peyton, Anthony

AU - Yin, Wuliang

PY - 2021

Y1 - 2021

N2 - Eddy current sensors can be used to test the characteristics and measure the parameters of the conductive samples. As the main obstacle of the multifrequency eddy current (MEC) sensor, the liftoff distance affects the effectiveness and accuracy of the measurement. In this article, a material-independent algorithm has been proposed for the restoration of the liftoff distance when using the MEC sensor, which is based on the approximation under the thin-skin effect. Experiment testing on the performance of the proposed method is presented. The results show that from the dual-frequency inductance, the liftoff distance could be restored with a maximum error of 0.24 mm for the distance up to 12 mm. Besides, the derived liftoff distance is used for the inversion of the magnetic permeability. Based on a liftoff insensitive inductance (LII) feature, the magnetic permeability of steels can be inversed in an iterative manner, with an error of less than 0.6 % for the liftoff distance up to 12 mm.

AB - Eddy current sensors can be used to test the characteristics and measure the parameters of the conductive samples. As the main obstacle of the multifrequency eddy current (MEC) sensor, the liftoff distance affects the effectiveness and accuracy of the measurement. In this article, a material-independent algorithm has been proposed for the restoration of the liftoff distance when using the MEC sensor, which is based on the approximation under the thin-skin effect. Experiment testing on the performance of the proposed method is presented. The results show that from the dual-frequency inductance, the liftoff distance could be restored with a maximum error of 0.24 mm for the distance up to 12 mm. Besides, the derived liftoff distance is used for the inversion of the magnetic permeability. Based on a liftoff insensitive inductance (LII) feature, the magnetic permeability of steels can be inversed in an iterative manner, with an error of less than 0.6 % for the liftoff distance up to 12 mm.

KW - Eddy current

KW - liftoff

KW - material independent

KW - nondestructive testing (NDT)

KW - permeability measurement

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VL - 70

JO - IEEE Transactions on Instrumentation and Measurement

JF - IEEE Transactions on Instrumentation and Measurement

M1 - 9249032

ER -

Inversion of Distance and Magnetic Permeability Based on Material-Independent and Liftoff Insensitive Algorithms Using Eddy Current Sensor

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Electromagnetic Sensing Group

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Inversion of Distance and Magnetic Permeability Based on Material-Independent and Liftoff Insensitive Algorithms Using Eddy Current Sensor

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Keywords

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Electromagnetic Sensing Group

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