Jpn. J. Appl. Phys. 45 (2006) pp. L980-L983 |Previous Article| |Next Article| |Table of Contents|
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Letter
Experimental Study of Detectable Sizes of Surface Flaws on Copper Tubes by Nondestructive Inspection Using High-Tc Superconducting Quantum Interference Device
Yoshimi Hatsukade,
Shinya Okuno,
Kazuaki Mori1 and
Saburo Tanaka
Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
1Sumitomo Light Metal Industries, Ltd., Copper Works, 100 Ougishinmichi, Ichinomiya-cho, Hoi-gun, Aichi 441-1295, Japan
(Received July 11, 2006; accepted July 30, 2006; published online September 8, 2006)
Detectable sizes of shallow flaws on thin copper tubes were experimentally investigated using an eddy-current-based nondestructive inspection system with a high-Tc superconducting quantum interference device (SQUID) gradiometer. At an excitation field of 5.6 µT at 3 kHz, a magnetic anomaly due to the shallowest flaw of 10 µm depth, 100 µm width, and 15 mm length on the surface of a tube specimen of 6.35 mm outer diameter and 0.8 mm thickness was successfully measured. Signal amplitude due to a flaw was proportional to effective flaw volume that made an induced eddy current detour. The experimental results indicate that the detectable volume of a surface flaw on a copper tube should be 1×106 µm3 with some increase in signal-to-noise ratio.
URL:
http://jjap.jsap.jp/link?JJAP/45/L980/
DOI: 10.1143/JJAP.45.L980
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