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High-Tc dc-SQUID magnetometer and its application in eddy current non-destructive evaluation.

Author(s) : QI H. H., LANG P. L., ZHANG M. J., et al.

Type of article: Article

Summary

The authors have fabricated and tested a high-Tc dc-SQUID magnetometer patterned on a YBCO thin film deposited on a SrTiO3 bicrystal substrate. The measurement of noise spectrum at 77 K showed that the magnetometer has a white noise without superconducting shield. The authors constructed a test system for eddy current non-destructive evaluation of conducting aluminium plates by using the magnetometer. Flaws over 10 mm below the surface can be clearly identified. By mapping the magnetic field distribution, the authors can locate the flaw position. The signals caused by flaw were expanded due to the use of double-D type driving coil with a wider central slit. The experimental results confirmed that this test system could operate in a magnetic unshielded environment.

Details

  • Original title: High-Tc dc-SQUID magnetometer and its application in eddy current non-destructive evaluation.
  • Record ID : 2005-1121
  • Languages: English
  • Source: Cryogenics - vol. 44 - n. 10
  • Publication date: 2004/10

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