STP722

    Design of a Pulsed Eddy-Current Test Equipment with Digital Signal Analysis

    Published: Jan 1981


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    Abstract

    Test equipment was designed for investigations on the application of the pulsed eddy-current method on the detection of subsurface defects in thicker components or layers. The evaluation of the signals delivered by the coil system is performed in four single channels with different sampling delays or by plotting the signal time shape. The measured values are digitized and stored within the memory of a minicomputer for data processing. The coil systems are dimensioned in such a manner that the desired sensitivity was obtained for a defect depth range of about 10 mm in austenitic materials. The determination of the time of the signal zero crossing gives information concerning the defect distance from the surface.

    Keywords:

    pulsed eddy current method, time sampling, coil systems, test blocks, artificial defects, defect depth, data acquisition and processing, austenitic components, welded claddings


    Author Information:

    Wittig, G
    Bundesanstalt für Materialprüfung, Berlin,

    Thomas, H-M
    Bundesanstalt für Materialprüfung, Berlin,


    Paper ID: STP27600S

    Committee/Subcommittee: E07.11

    DOI: 10.1520/STP27600S


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