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Nondestructive inspection using an HTS SQUID for copper heat-exchanger tubes.

[In Japanese. / En japonais.]

Author(s) : HATASUKADE Y., KOSUGI A., MORI K., et al.

Type of article: Article

Summary

An eddy-current-based nondestructive inspection 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 microT at 5 kHz, a flaw in the tube, measuring 30 microm 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.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2006-2864
  • Languages: Japanese
  • Source: Journal of the Cryogenic Society of Japan - vol. 40 - n. 8
  • Publication date: 2005

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