High-Tc SQUID magnetometers and gradiometers for NDE application

J. T. Jeng, H. E. Horng, H. C. Yang

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)


    The performance of the superconducting quantum interference device (SQUID) nondestructive evaluation (NDE) system with a shielded magnetometer and unshielded gradiometers were investigated. In the magnetometer NDE system, the environmental noise was reduced with the SQUID seating inside a μ-metal cylinder, whereas the environmental noise was eliminated with electronic subtraction in the gradiometer NDE system. For the shielded magnetometer NDE system, the signal-to-noise ratio was improved with a higher excitation field to enhance the defect signal. For the gradiometer NDE system, the signal-to-noise ratio was improved as a result of the reduction of environmental noise. The performance of two SQUID NDE systems is compared and the results are discussed.

    Original languageEnglish
    Pages (from-to)105-108
    Number of pages4
    JournalPhysica C: Superconductivity and its applications
    Issue number1-4
    Publication statusPublished - 2002 Mar 1


    • Gradiometer
    • Magnetometer

    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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