Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature

Gang Hu; Ruochen Huang; Mingyang Lu; Lei Zhou; Wuliang Yin

doi:10.1016/j.measurement.2021.109876

Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature

Gang Hu, Ruochen Huang, Mingyang Lu, Lei Zhou, Wuliang Yin

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Abstract

This paper proposes a linear eddy-current feature to determine the radius of a metallic ball in a non-contact manner. An electromagnetic eddy-current sensor with two coils is placed co-axially to the metal ball during measurement. It is well known that the distance between the sensor and test piece (i.e. lift-off) affects eddy-current signals. In this paper, it is found that the peak frequency feature of inductance spectrum is linear to the lift-off spacing between the centre of coil and ball. Besides, the slope of peak frequencies versus lift-offs is linked to the radius of ball. The radius of metallic balls is retrieved from the experimental and embedded analytical result of the slope. Measurements have been carried out on 6 metallic balls with different radii. The radius of the metallic ball can be retrieved with an error of less than 2%.

Original language	English
Article number	109876
Journal	Measurement
Volume	184
Early online date	24 Jul 2021
DOIs	https://doi.org/10.1016/j.measurement.2021.109876
Publication status	Published - 1 Nov 2021

Keywords

Eddy current sensor
Lift-off variation
Multi-frequency testing
Peak frequency feature
Radius measurement

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10.1016/j.measurement.2021.109876

Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference featureAccepted author manuscript, 818 KBLicence: CC BY-NC-ND

Electromagnetic Sensing Group
Peyton, A. (PI), Fletcher, A. (Researcher), Daniels, D. (CoI), Conniffe, D. (PGR student), Podd, F. (PI), Davidson, J. (Researcher), Anderson, J. (Support team), Wilson, J. (Researcher), Marsh, L. (PI), O'Toole, M. (PI), Watson, S. (PGR student), Yin, W. (PI), Regan, A. (PGR student), Williams, K. (Researcher), Rana, S. (Researcher), Khalil, K. (PGR student), Hills, D. (PGR student), Whyte, C. (PGR student), Wang, C. (PGR student), Hodgskin-Brown, R. (PGR student), Dadkhahtehrani, F. (PGR student), Forster, S. (PGR student), Zhu, F. (PGR student), Yu, K. (PGR student), Xiong, L. (PGR student), Lu, T. (PGR student), Zhang, L. (PGR student), Lyu, R. (PGR student), Zhu, R. (PGR student), She, S. (PGR student), Meng, T. (PGR student), Pang, X. (PGR student), Zheng, X. (PGR student), Bai, X. (PGR student), Zou, X. (PGR student), Ding, Y. (PGR student), Shao, Y. (PGR student), Xia, Z. (PGR student), Zhang, Z. (PGR student), Khangerey, R. (PGR student) & Lawless, B. (Researcher)
1/10/04 → …
Project: Research

Cite this

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title = "Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature",

abstract = "This paper proposes a linear eddy-current feature to determine the radius of a metallic ball in a non-contact manner. An electromagnetic eddy-current sensor with two coils is placed co-axially to the metal ball during measurement. It is well known that the distance between the sensor and test piece (i.e. lift-off) affects eddy-current signals. In this paper, it is found that the peak frequency feature of inductance spectrum is linear to the lift-off spacing between the centre of coil and ball. Besides, the slope of peak frequencies versus lift-offs is linked to the radius of ball. The radius of metallic balls is retrieved from the experimental and embedded analytical result of the slope. Measurements have been carried out on 6 metallic balls with different radii. The radius of the metallic ball can be retrieved with an error of less than 2%.",

keywords = "Eddy current sensor, Lift-off variation, Multi-frequency testing, Peak frequency feature, Radius measurement",

author = "Gang Hu and Ruochen Huang and Mingyang Lu and Lei Zhou and Wuliang Yin",

note = "Funding Information: This work was supported by [UK Engineering and Physical Sciences Research Council ( EPSRC )] [grant number: EP/P027237/1 ] [title: Real-time In-line Microstructural Engineering (RIME)]. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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doi = "10.1016/j.measurement.2021.109876",

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T1 - Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature

AU - Hu, Gang

AU - Huang, Ruochen

AU - Lu, Mingyang

AU - Zhou, Lei

AU - Yin, Wuliang

N1 - Funding Information: This work was supported by [UK Engineering and Physical Sciences Research Council ( EPSRC )] [grant number: EP/P027237/1 ] [title: Real-time In-line Microstructural Engineering (RIME)]. Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/11/1

Y1 - 2021/11/1

N2 - This paper proposes a linear eddy-current feature to determine the radius of a metallic ball in a non-contact manner. An electromagnetic eddy-current sensor with two coils is placed co-axially to the metal ball during measurement. It is well known that the distance between the sensor and test piece (i.e. lift-off) affects eddy-current signals. In this paper, it is found that the peak frequency feature of inductance spectrum is linear to the lift-off spacing between the centre of coil and ball. Besides, the slope of peak frequencies versus lift-offs is linked to the radius of ball. The radius of metallic balls is retrieved from the experimental and embedded analytical result of the slope. Measurements have been carried out on 6 metallic balls with different radii. The radius of the metallic ball can be retrieved with an error of less than 2%.

AB - This paper proposes a linear eddy-current feature to determine the radius of a metallic ball in a non-contact manner. An electromagnetic eddy-current sensor with two coils is placed co-axially to the metal ball during measurement. It is well known that the distance between the sensor and test piece (i.e. lift-off) affects eddy-current signals. In this paper, it is found that the peak frequency feature of inductance spectrum is linear to the lift-off spacing between the centre of coil and ball. Besides, the slope of peak frequencies versus lift-offs is linked to the radius of ball. The radius of metallic balls is retrieved from the experimental and embedded analytical result of the slope. Measurements have been carried out on 6 metallic balls with different radii. The radius of the metallic ball can be retrieved with an error of less than 2%.

KW - Eddy current sensor

KW - Lift-off variation

KW - Multi-frequency testing

KW - Peak frequency feature

KW - Radius measurement

U2 - 10.1016/j.measurement.2021.109876

DO - 10.1016/j.measurement.2021.109876

M3 - Article

SN - 0263-2241

VL - 184

JO - Measurement

JF - Measurement

M1 - 109876

ER -

Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature

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