Defect detection in embedded reinforcing bars and cables using a multi-coil magnetic field sensor

John Simmonds, Patrick Gaydecki

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A nondestructive testing system which detects surface defects in steel bars or cables embedded within reinforced or pre-stressed concrete is described. The component under test is energized by an alternating current of sufficient frequency to ensure that current flows takes place on the surface of the steel. Detection coils, in conjunction with a suitable amplification system, are positioned at various alignments with respect to the steel bar or cable, and thereby detect, through mutual induction, both the dominant flow path and the deviated current flow in the vicinity of a defect. The output signals from the multi-coil array are converted and fed to a computer for storage and processing. This system has clear relevance to the civil engineering nondestructive testing industry.

    Original languageEnglish
    Pages (from-to)640-648
    Number of pages9
    JournalMeasurement Science and Technology
    Volume10
    Issue number7
    DOIs
    Publication statusPublished - Jul 1999

    Keywords

    • Civil engineering
    • Computerized image generation
    • Electromechanical scanner
    • Induced magnetic field
    • Magnetic field strength
    • Magnetic field vector
    • Multi-coil sensor array
    • Nondestructive testing
    • Reinforced concrete
    • Steel bars and cables

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