Nondestructive evaluation of flaws using SQUIDs

J. T. Jeng*, H. E. Horng, Chao Hsiang Chen, J. H. Chen, H. C. Yang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


Using high-Tc SQUIDs, we have designed a nondestructive evaluation system to probe buried flaws. The frequency of the excitation magnetic fields was varied from 10 to 800 Hz and the magnetic fields generated from the eddy current was lock-in detected. The SQUIDs output data revealed the most effective excitation frequencies for the flaws with different depths and widths. The signal-to-noise ratio of the deep flaws can be further enhanced either by using higher excitation fields or using the SQUIDs with higher low-frequency sensitivity.

Original languageEnglish
Pages (from-to)2637-2638
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume341-348 (IV)
Publication statusPublished - 2000 Nov
EventInternational Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA
Duration: 2000 Feb 202000 Feb 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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