Crack detection for the graphite slab using the high-Tc SQUID in unshielded environment

Jen Tzong Jeng, Herng Er Horng, Hong Chang Yang

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    The nondestructive evaluation (NDE) for the crack inside a graphite slab was investigated by using the high-T(c) SQUID NDE system in unshielded environment. The crack-depth dependence of the crack signal was explored with the excitation frequency varied from 2 to 20 kHz. It was found that the phase of the crack signal is a linear function of the crack depth for various excitation frequencies. In addition, forlinear phase depth relation scaled in an empirical equation with the skin depth as the only variable. The empirical equation was useful in determining the proper excitation frequency for the eddy-current NDE of conductive samples.

    Original languageEnglish
    Pages (from-to)174-177
    Number of pages4
    JournalPhysica C: Superconductivity and its applications
    Volume372-376
    Issue numberPART 1
    DOIs
    Publication statusPublished - 2002 Aug 1

    Keywords

    • Graphite
    • Nondestructive evaluation
    • SQUID
    • Skin depth

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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