High-Tc SQUID gradiometer system for magnetocardiography in an unshielded environment

S. H. Liao*, S. C. Hsu, C. C. Lin, H. E. Horng, J. C. Chen, M. J. Chen, C. H. Wu, H. C. Yang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

24 Citations (Scopus)


We set up an electronic gradiometer for magnetocardiography (MCG) in an unshielded environment. The electronically balanced gradiometer consists of high-temperature radio-frequency superconducting quantum interference device (rf SQUID) magnetometers. The rf SQUID magnetometers are arranged to form the electronic first-order, four-vector gradiometer, or second-order gradiometer. The output of the MCG signal was filtered by a band pass (1-30 Hz) and power line filters. We can reduce the noise to ∼1 pT Hz-1/2 at 1 Hz for second-order or four-vector gradiometers. Two-dimensional MCG imaging is demonstrated. The results are discussed with data measured in the moderate magnetically shielded environment.

Original languageEnglish
Pages (from-to)1426-1429
Number of pages4
JournalSuperconductor Science and Technology
Issue number12
Publication statusPublished - 2003 Dec
EventISEC 2003, International Superconducting Electronics Conference - Sydney,NSW, Australia
Duration: 2003 Jul 72003 Jul 11

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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