A Novel Pulsed Eddy Current Criterion for Non-Ferromagnetic Metal Thickness Quantifications under Large Liftoff

The pulsed eddy current (PEC) inspection is considered a versatile non-destructive evaluation technique, and it is widely used in metal thickness quantifications for structural health monitoring and target recognition. However, for non-ferromagnetic conductors covered with non-uniform thick insulati...

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Published inSensors (Basel, Switzerland) Vol. 22; no. 2; p. 614
Main Authors Wang, Haowen, Huang, Jiangbo, Liu, Longhuan, Qin, Shanqiang, Fu, Zhihong
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 01.01.2022
MDPI
Subjects
Aluminum
Analysis
Conductors
dynamic apparent time constant
Eddy currents
Ferromagnetism
Inspection
Insulating layers
Investigations
lift-off variations
Noise
Nondestructive testing
Permeability
pulsed eddy current
Structural health monitoring
Thickness
thickness quantifications
Time constant
dynamic apparent time constant
lift-off variations
pulsed eddy current
thickness quantifications
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Abstract The pulsed eddy current (PEC) inspection is considered a versatile non-destructive evaluation technique, and it is widely used in metal thickness quantifications for structural health monitoring and target recognition. However, for non-ferromagnetic conductors covered with non-uniform thick insulating layers, there are still deficiencies in the current schemes. The main purpose of this study is to find an effective feature, to measure wall thinning under the large lift-off variations, and further expand application of the PEC technology. Therefore, a novel method named the dynamic apparent time constant (D-ATC) is proposed based on the coil-coupling model. It associates the dynamic behavior of the induced eddy current with the geometric dimensions of the non-ferromagnetic metallic component by the time and amplitude features of the D-ATC curve. Numeral calculations and experiments show that the time signature is immune to large lift-off variations.
AbstractList The pulsed eddy current (PEC) inspection is considered a versatile non-destructive evaluation technique, and it is widely used in metal thickness quantifications for structural health monitoring and target recognition. However, for non-ferromagnetic conductors covered with non-uniform thick insulating layers, there are still deficiencies in the current schemes. The main purpose of this study is to find an effective feature, to measure wall thinning under the large lift-off variations, and further expand application of the PEC technology. Therefore, a novel method named the dynamic apparent time constant (D-ATC) is proposed based on the coil-coupling model. It associates the dynamic behavior of the induced eddy current with the geometric dimensions of the non-ferromagnetic metallic component by the time and amplitude features of the D-ATC curve. Numeral calculations and experiments show that the time signature is immune to large lift-off variations.
Audience Academic
Author Wang, Haowen
Fu, Zhihong
Liu, Longhuan
Huang, Jiangbo
Qin, Shanqiang
AuthorAffiliation 1 School of Robot Engineering, Yangtze Normal University, Chongqing 408100, China; 19990002@yznu.edu.cn (J.H.); 20190025@yznu.edu.cn (S.Q.)
2 School of Electrical Engineering, Chongqing University, Chongqing 400044, China; 20133954@cqu.edu.cn (L.L.); fuzhihong@cqu.edu.cn (Z.F.)
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– name: 2 School of Electrical Engineering, Chongqing University, Chongqing 400044, China; 20133954@cqu.edu.cn (L.L.); fuzhihong@cqu.edu.cn (Z.F.)
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Issue 2
Keywords dynamic apparent time constant
lift-off variations
pulsed eddy current
thickness quantifications
Language English
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Snippet The pulsed eddy current (PEC) inspection is considered a versatile non-destructive evaluation technique, and it is widely used in metal thickness...
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StartPage 614
SubjectTerms Aluminum
Analysis
Conductors
dynamic apparent time constant
Eddy currents
Ferromagnetism
Inspection
Insulating layers
Investigations
lift-off variations
Noise
Nondestructive testing
Permeability
pulsed eddy current
Structural health monitoring
Thickness
thickness quantifications
Time constant
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Title A Novel Pulsed Eddy Current Criterion for Non-Ferromagnetic Metal Thickness Quantifications under Large Liftoff
URI https://www.ncbi.nlm.nih.gov/pubmed/35062572
https://www.proquest.com/docview/2621378835
https://search.proquest.com/docview/2622277113
https://pubmed.ncbi.nlm.nih.gov/PMC8781720
https://doaj.org/article/c67b68a8bafe41b6a252e2bfb6aed94a
Volume 22
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