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

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

doi:10.1109/77.919587

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

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

^*此作品的通信作者

研究成果: 雜誌貢獻 › 會議論文 › 同行評審

32 引文斯高帕斯（Scopus）

摘要

We reported the nondestructive evaluation of flaws in conductive samples with the high-T_c 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
卷	11
發行號	1 I
DOIs	https://doi.org/10.1109/77.919587
出版狀態	已發佈 - 2001 3月
對外發佈	是
事件	2000 Applied Superconductivity Conference - Virginia Beach, VA, 美国持續時間: 2000 9月 17 → 2000 9月 22

ASJC Scopus subject areas

電子、光磁材料
凝聚態物理學
電氣與電子工程

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10.1109/77.919587

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title = "Detection of deep flaws by using a HTS-SQUID in unshielded environment",

abstract = "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.",

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author = "Jeng, {J. T.} and Yang, {S. Y.} and Horng, {H. E.} and Yang, {H. C.}",

note = "Funding Information: Manuscript reccivcd August 3, 2000. This work was supported by the National Sciencc Council of R.O.C. under Grant No. NSC-89-2112-M-003-012, and NSC-89-2112-M-002-029. J. T. Jeng is with the Physics Departmcnt, National Taiwan Normal Ilniversity, Taipei 116, Taiwan (e-inail: s41321~cc.ntnu.edu.t~) S.Y . Yang is with thc Institute ofl'hysics, Academia Sinica, Taipei 115, Taiwan (e-mail: eniesdolb~ms28.liinet.tiet) 11. E. Morng is with the Physics Dcpartmcnt, National Taiwan Normal University, Taipci 1 16, Taiwan (e-mail: phyfv001@scc.ntnu.edu.tw) H. C. Yang is with the Physics Department, National Taiwan University, Taipei 106, Taiwan (c-mail: licynag@pliys.ntu.edu.tw); 2000 Applied Superconductivity Conference ; Conference date: 17-09-2000 Through 22-09-2000",

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N1 - Funding Information: Manuscript reccivcd August 3, 2000. This work was supported by the National Sciencc Council of R.O.C. under Grant No. NSC-89-2112-M-003-012, and NSC-89-2112-M-002-029. J. T. Jeng is with the Physics Departmcnt, National Taiwan Normal Ilniversity, Taipei 116, Taiwan (e-inail: s41321~cc.ntnu.edu.t~) S.Y . Yang is with thc Institute ofl'hysics, Academia Sinica, Taipei 115, Taiwan (e-mail: eniesdolb~ms28.liinet.tiet) 11. E. Morng is with the Physics Dcpartmcnt, National Taiwan Normal University, Taipci 1 16, Taiwan (e-mail: phyfv001@scc.ntnu.edu.tw) H. C. Yang is with the Physics Department, National Taiwan University, Taipei 106, Taiwan (c-mail: licynag@pliys.ntu.edu.tw)

PY - 2001/3

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N2 - 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.

AB - 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.

KW - Depth

KW - HTS-SQUID

KW - Nondestructive evaluation

KW - Phase

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

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