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2017 ; 17
(5
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
A Gradient-Field Pulsed Eddy Current Probe for Evaluation of Hidden Material
Degradation in Conductive Structures Based on Lift-Off Invariance
#MMPMID28441328
Li Y
; Jing H
; Zainal Abidin IM
; Yan B
Sensors (Basel)
2017[Apr]; 17
(5
): ä PMID28441328
show ga
Coated conductive structures are widely adopted in such engineering fields as
aerospace, nuclear energy, etc. The hostile and corrosive environment leaves
in-service coated conductive structures vulnerable to Hidden Material Degradation
(HMD) occurring under the protection coating. It is highly demanded that HMD can
be non-intrusively assessed using non-destructive evaluation techniques. In light
of the advantages of Gradient-field Pulsed Eddy Current technique (GPEC) over
other non-destructive evaluation methods in corrosion evaluation, in this paper
the GPEC probe for quantitative evaluation of HMD is intensively investigated.
Closed-form expressions of GPEC responses to HMD are formulated via analytical
modeling. The Lift-off Invariance (LOI) in GPEC signals, which makes the HMD
evaluation immune to the variation in thickness of the protection coating, is
introduced and analyzed through simulations involving HMD with variable depths
and conductivities. A fast inverse method employing magnitude and time of the LOI
point in GPEC signals for simultaneously evaluating the conductivity and
thickness of HMD region is proposed, and subsequently verified by finite element
modeling and experiments. It has been found from the results that along with the
proposed inverse method the GPEC probe is applicable to evaluation of HMD in
coated conductive structures without much loss in accuracy.