Eddy-Current-Based Nondestructive Inspection System Using Superconducting Quantum Interference Device for Thin Copper Tubes
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- Hatsukade Yoshimi
- Toyohashi University of Technology
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- Kosugi Akifumi
- Toyohashi University of Technology
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- Mori Kazuaki
- Sumitomo Light Metal Industries, Ltd.
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- Tanaka Saburo
- Toyohashi University of Technology
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Abstract
An eddy-current-based nondestructive inspection (NDI) system using superconducting quantum interference device (SQUID) cooled using a coaxial pulse tube cryocooler was constructed for the inspection of microflaws on copper tubes employing a high-Tc SQUID gradiometer and a Helmholtz-like coil inducer. The detection of artificial flaws several tens of μm in depth on copper tubes 6.35 mm in outer diameter and 0.825 mm in thickness was demonstrated using the SQUID-NDI system. With an excitation field of 1.6 μT at 5 kHz, a 30-μm-depth flaw was successfully detected by the system at an SN ratio of at least 20. The magnetic signal amplitude due to the flaw was proportional to both excitation frequency and the square of flaw depth. With consideration of the system’s sensitivity, the results indicate that sub-10-μm-depth flaws are detectable by the SQUID-NDI system.
Journal
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 43 (11B), L1488-L1491, 2004
The Japan Society of Applied Physics
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Details 詳細情報について
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- CRID
- 1390282681242059136
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- NII Article ID
- 10014034614
- 210000057061
- 130004531577
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- NII Book ID
- AA11906093
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- ISSN
- 13474065
- 00214922
- http://id.crossref.org/issn/13474065
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- NDL BIB ID
- 7156444
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed