Noise properties of highly balanced YBa2Cu3Oy directly coupled gradiometers and MCG measurement in magnetically unshielded environment

A. Tsukamoto, K. Yokosawa, T. Fukazawa, D. Suzuki, K. Tsukada, T. Miyashita, A. Kandori, K. Takagi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We have fabricated a first-order, directly coupled gradiometer with a gradiometric balance below 0.1% without balance adjustment by selecting the coupling direction of the pickup coil and the superconducting quantum interference device. The noise of the gradiometers with various balances measured in an unshielded environment decreased in proportion to the improvement in balance. However, the noise of the gradiometer with a balance of 0.03% was limited by the gradient field component of the environmental noise. Magnetocardiogram measurement with this gradiometer in an unshielded environment was also demonstrated.

Original languageEnglish
Pages (from-to)41-44
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number1-4
Publication statusPublished - Mar 1 2002
Externally publishedYes


  • Gradiometer
  • YBaCuO

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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