Nondestructive Inspection Using an HTS SQUID for Copper Heat-exchanger Tubes

A nondestructive inspection (NDI) system using an HTS SQUID for copper heat-exchanger tubes has been constructed. An eddy-current-based NDI method using an HTS SQUID gradiometer cooled using a cryocooler was employed for the detection of micro flaws in thin copper tubes 6.35 mm in diameter and 0.8 m...

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Veröffentlicht in:	TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 2005, Vol.40(8), pp.319-326
Hauptverfasser:	HATASUKADE, Yoshimi, KOSUGI, Akifumi, MORI, Kazuaki, TANAKA, Saburo
Format:	Artikel
Sprache:	eng
Schlagworte:	copper tube eddy current gradiometer HTS SQUID nondestructive inspection
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Beschreibung
Zusammenfassung:	A nondestructive inspection (NDI) system using an HTS SQUID for copper heat-exchanger tubes has been constructed. An eddy-current-based NDI method using an HTS SQUID gradiometer cooled using a cryocooler was employed for the detection of micro flaws in thin copper tubes 6.35 mm in diameter and 0.8 mm in thickness. With an excitation field of 1.6 μT at 5 kHz, a flaw in the tube, measuring 30 μm deep and 15 mm long, was successfully detected by the system with a high signal-noise ratio of at least 20. Numerical simulations were also conducted to determine how many sensors would be required for inspection around the circumference of an entire tube.
ISSN:	0389-2441 1880-0408
DOI:	10.2221/jcsj.40.319