Biomagnetic measurements with HTS SQUID magnetometers in moderate shielded environments

Herng Er Horng, Shou Yen Hung, Jen Tzong Jeng, Shu Hsien Liao, S. C. Hsu, Ji Chuu Hwang, Hong Chang Yang

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


An HTS SQUID magnetometer for biomagnetic measurements was implemented in a moderate noise shielded environment. The intrinsic noises of the SQUID magnetometer shielded with a tri-layer magnetic shielding cylinder were 50 fT/Hz1/2 above 10 Hz and 100 fT/Hz1/2 at 0.1 Hz. The moderate shielded environments are constructed of mu-metal layers. With the moderate shielding the magnitude of the QRS complex of a rat specimen was found to be around 10 pT and the signal-to-noise ratio was larger than 10. The requirements for improving biomagnetic measurements in the moderate magnetic shielding are discussed.

Original languageEnglish
Pages (from-to)381-384
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 I
Publication statusPublished - 2003 Jun
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: 2002 Aug 42002 Aug 9


  • Biomagnetism
  • Magnetometer

ASJC Scopus subject areas

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


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