Study of asymmetric gradiometer sensor configurations for eddy current based non-destructive testing in an industrial environment

Henok Tesfalem, Adam D. Fletcher, Matthew Brown, Bob Chapman, Anthony J. Peyton

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This paper presents the design and validation of a novel eddy current (EC) probe that can be used to detect deep sub-surface cracks and characterise the properties of graphite bricks, such as those used to make up the core of an Advanced Gas-cooled Reactor (AGR). In this study, a curved asymmetrical gradiometer probe has been devised and optimised to enhance the depth sensitivity to defects and conductivity variations in the graphite. Experimental and numerical studies are carried out. The results show an average of 43.00% improvement in sensitivity compared to a traditional axial gradiometer routinely used during AGR core inspections. Further experimental tests on a graphite brick containing multiple closed key-way root sub-surface cracks show the superiority of the proposed probe over the traditional probe at locating deep sub-surface cracks that were not detected previously.
    Original languageEnglish
    Pages (from-to)1-10
    Number of pages10
    JournalNDT & E International
    Volume100
    Early online date25 Jul 2018
    DOIs
    Publication statusPublished - Dec 2018

    Keywords

    • Advanced gas-cooled reactor
    • Graphite
    • Sub-surface crack
    • Non-destructive testing
    • Eddy currents
    • Sensitivity

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    • 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

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