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Microwave open-ended waveguide for detection and characterisation of FBHs in coated GFRP pipes

Sutthaweekul, Ruslee, Tian, Guy Yun, Wang, Zijun and Ciampa, Francesco (2019) Microwave open-ended waveguide for detection and characterisation of FBHs in coated GFRP pipes COMPOSITE STRUCTURES, 225 (111080).

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Abstract

Accessing to glass fibre reinforcement plastic (GFRP) pipes in the on-line process is often limited to one side. To detect an internal defect of coated GFRP pipe, common non-destructive testing (NDT) methods such as eddy current testing and thermography are not effective because GFRP pipes are not conductive and their coating prevents heat transfer to the inner section of the material. Moreover, the curvature of GFRP pipes introduces lift-off variation, which is the primary challenge for NDT methods using C-scan technique; e.g., ultrasonic. This work proposes a novel microwave NDT application to detect and characterise internal defect; i.e., flat-bottom hole (FBH) in coated GFRP pipes. Initially, responses of four FBH areas obtained by microwave open-ended waveguide probe are analysed using principal component analysis (PCA) to reveal FBH defect and eliminate the pipe curvature influence. Following that, synthetic aperture radar (SAR) tomography images are produced to select the corresponding principal component and verify the location of FBHs. Finally, FBHs are evaluated using PC feature and SAR tomography including time-of-flight feature. The results show that the proposed method can clearly reveal the area of FBHs. Moreover, depths of FBHs are characterised by analysing the time-of-flight feature of background-subtracted responses. © 2019

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Sutthaweekul, Ruslee
Tian, Guy Yun
Wang, Zijun
Ciampa, Francescof.ciampa@surrey.ac.uk
Date : 1 October 2019
Funders : Horizon 2020 “EXTREME” project, Royal Society-Newton Mobility Grant
DOI : 10.1016/j.compstruct.2019.111080
Copyright Disclaimer : © 2019 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Microwave NDT; Glass fibre reinforcement plastic (GFRP) pipes; Flat-bottom hole; PCA; Synthetic aperture radar; Tomography
Additional Information : The RS and GYT would like to thank the ministry of Science and Technology, Royal Thai government for the PhD scholarship support and acknowledge the “NDTonAIR” project for the research support. ZW would like to thank the financial support provided by the China Scholarship Council ref. “ZYGX2016J156”. FC acknowledges the Horizon 2020 “EXTREME” project and the Royal Society-Newton Mobility Grant (IEC\NSFC\170387) to support this research work. Data Availability FC acknowledges the Royal Society-Newton Mobility Grant (IEC\NSFC\170387) to support this research work.
Depositing User : Diane Maxfield
Date Deposited : 13 Sep 2019 13:37
Last Modified : 13 Sep 2019 13:37
URI: http://epubs.surrey.ac.uk/id/eprint/852615

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