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

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

4 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1295-1298
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	11
Issue number	1 I
DOIs	https://doi.org/10.1109/77.919587
Publication status	Published - 2001 Mar
Externally published	Yes
Event	2000 Applied Superconductivity Conference - Virginia Beach, VA, United States Duration: 2000 Sept 17 → 2000 Sept 22

Keywords

Depth
HTS-SQUID
Nondestructive evaluation
Phase

ASJC Scopus subject areas

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

Access to Document

10.1109/77.919587

Cite this

@article{37aea15cb4234fd9a2469ece7f3983d0,

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.",

keywords = "Depth, HTS-SQUID, Nondestructive evaluation, Phase",

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",

year = "2001",

month = mar,

doi = "10.1109/77.919587",

language = "English",

volume = "11",

pages = "1295--1298",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "1 I",

}

TY - JOUR

T1 - Detection of deep flaws by using a HTS-SQUID in unshielded environment

AU - Jeng, J. T.

AU - Yang, S. Y.

AU - Horng, H. E.

AU - Yang, H. C.

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

Y1 - 2001/3

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

UR - http://www.scopus.com/inward/record.url?scp=0035268113&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035268113&partnerID=8YFLogxK

U2 - 10.1109/77.919587

DO - 10.1109/77.919587

M3 - Conference article

AN - SCOPUS:0035268113

SN - 1051-8223

VL - 11

SP - 1295

EP - 1298

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 1 I

T2 - 2000 Applied Superconductivity Conference

Y2 - 17 September 2000 through 22 September 2000

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this