Surface Crack Detection in Dressed Steel Welds Using Advanced Quantum Well Hall Effect Sensors

James Martin Watson, Chen-Wei Liang, Ehsan Ahmad, James Sexton, Mohamed Missous

    Research output: Contribution to conferencePaperpeer-review

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    Abstract

    A review of the different applications and developments of using Quantum Well Hall Effect (QWHE) sensors for NDE applications is provided. In addition, a method for using a QWHE sensor-based device to sensitively map the magnetic field across an NDE weld sample was performed.

    A QWHE sensor-based AC–DC magnetometer developed at the University of Manchester, with a bandwidth of 1.5 kHz and a minimum detection limit of 500 nT, was used to obtain direct magnetic field measurements of a dressed steel weld sample. The linear surface-breaking defect present in the sample had dimensions of 14 mm length, 1.75 mm depth and a 40 휇m gape.

    The sample was illuminated using an AC magnet capable of operating between 0 – 2 kHz. The RMS magnetic field strengths used in this investigation varied between 3 to 33 mT. Results from this study confirm that the Magnetic Flux Leakage (MFL) caused by the surface-breaking defect can be detected across the entire 50 Hz – 1.2 kHz range using the highly sensitive QWHE sensor-based magnetometer.
    Original languageEnglish
    Publication statusPublished - 7 Sept 2017
    EventThe 56th Annual British Conference of Non-Destructive Testing - Telford, UK, Telford, United Kingdom
    Duration: 5 Sept 20177 Sept 2017
    http://www.bindt.org/events/PastEvents/ndt-2017/

    Conference

    ConferenceThe 56th Annual British Conference of Non-Destructive Testing
    Abbreviated titleNDT 2017
    Country/TerritoryUnited Kingdom
    CityTelford
    Period5/09/177/09/17
    Internet address

    Keywords

    • Magnetic field imaging
    • Magnetovision
    • magnetometry
    • Quantum well
    • Quantum Well Hall Effect Sensor
    • Non-destructive testing
    • Non-destructive evaluation
    • magnetic flux leakage

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