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

Research output: Contribution to journalConference articlepeer-review

23 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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