Detection of deep flaws by using a HTS-SQUID in unshielded environment

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

    研究成果: 雜誌貢獻Conference article同行評審

    30 引文 斯高帕斯(Scopus)

    摘要

    We reported the nondestructive evaluation of flaws in conductive samples with the high-Tc SQUID operated at 77 K. By nulling the SQUID with an additional compensation, we can sensitively detect the excited magnetic field due to the eddy current around a deep flaw. To investigate the effects of the size and the depth of flaws on the induced magnetic field, the excited magnetic fields as a function of the depth were measured for buried slots with various widths and thickness. Besides, the amplitude and the phase with different excitation frequencies for a fixed slot size are also studied. It was found that for a fixed excitation frequency, the phase of the measured signal linearly responds to the depth of the slot, while the amplitude correlates with the height of the slot. The results are valuable for quantitative evaluation of flaws.

    原文英語
    頁(從 - 到)1295-1298
    頁數4
    期刊IEEE Transactions on Applied Superconductivity
    11
    發行號1 I
    DOIs
    出版狀態已發佈 - 2001 三月 1
    事件2000 Applied Superconductivity Conference - Virginia Beach, VA, 美国
    持續時間: 2000 九月 172000 九月 22

    ASJC Scopus subject areas

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

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