Affiliations: State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, School of Aerospace, Xi'an Jiaotong University, Xi'an, Shaanxi, China
Correspondence:
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Corresponding author: Yong Li, Research Centre for Inspection and Evaluation of Nuclear Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an, Shaanxi, China. Tel.: +86 29 8266 5721; E-mail:yong.li@mail.xjtu.edu.cn
Abstract: Subsurface Corrosion (SSC) has posed a severe threat to
the integrity of in-service conductive structures. Although Pulsed Eddy
Current technique (PEC) has been proven applicable regarding non-destructive
inspection of SSC, it has been found disadvantageous in terms of
Signal-to-noise Ratio (SNR) and sensitivity to SSC, etc. In light of this,
this paper proposes Pulse-modulation-based Eddy Current technique (PMEC).
The advantages of PMEC over PEC have been analyzed via simulations based on
analytical modeling and a series of experiments. Through theoretical and
experimental investigations, it has been found that PMEC realizes the
elaborate inspection of conductive structure, and has higher sensitivity in
detection and evaluation of SSC than PEC.
