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High temperature RF SQUID gradiometer applied to non-destructive testing.

Author(s) : FAN C. X., LU D. F., WONG K. W., XIN Y., XU B., ALZAYED N. S., CHESTER M., KNAPP D. E.

Type of article: Article

Summary

A two-hole high-temperature superconducting RF SQUID, capable of working in a noisy environment without any magnetic shielding, is employed as a gradiometer sensor without using flux transformer coils. This gradiometer, maintained at liquid-nitrogen temperature, is sensitive enough to detect small mock cracks in an aluminium alloy slab covered by another 25.4-mm thick solid aluminium alloy slab. Such a non-destructive testing device should have a significant impact on metal fatigue detection technology and demonstrates an important practical usage of high temperature superconductors.

Details

  • Original title: High temperature RF SQUID gradiometer applied to non-destructive testing.
  • Record ID : 1996-0041
  • Languages: English
  • Source: Cryogenics - vol. 34 - n. 8
  • Publication date: 1994/08

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