High-Tc SQUID magnetometers and gradiometers for NDE application

J. T. Jeng, H. E. Horng, H. C. Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The performance of the superconducting quantum interference device (SQUID) nondestructive evaluation (NDE) system with a shielded magnetometer and unshielded gradiometers were investigated. In the magnetometer NDE system, the environmental noise was reduced with the SQUID seating inside a μ-metal cylinder, whereas the environmental noise was eliminated with electronic subtraction in the gradiometer NDE system. For the shielded magnetometer NDE system, the signal-to-noise ratio was improved with a higher excitation field to enhance the defect signal. For the gradiometer NDE system, the signal-to-noise ratio was improved as a result of the reduction of environmental noise. The performance of two SQUID NDE systems is compared and the results are discussed.

Original languageEnglish
Pages (from-to)105-108
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number1-4
Publication statusPublished - 2002 Mar 1


  • Gradiometer
  • Magnetometer

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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