• DocumentCode
    1296496
  • Title

    Optimum DC current resolution of a ferromagnetic-core flux transformer coupled SQUID instrument

  • Author

    Gutmann, Peter ; Kose, Volkmar

  • Author_Institution
    Physikalisch-Technische Bundesanstalt, D-3300 Braunschweig, Germany
  • Issue
    2
  • fYear
    1987
  • fDate
    6/1/1987 12:00:00 AM
  • Firstpage
    267
  • Lastpage
    270
  • Abstract
    This paper describes theoretical and reproducible experimental results for a ferromagnetic-core (VITROVAC) flux transformer coupled SQUID instrument with equivalent noise temperatures < 1 K for 10-kΩ source resistance. The optimum dc current resolution of the superconducting transformer with and without a ferromagnetic core will be discussed. The high resolution of the SQUID instrument is demonstrated by the noise current plot and by noise temperature data of two-dimensional electron gases in GaAs-Gax Al1−xAs heterostructures.
  • Keywords
    Frequency measurement; Instruments; Noise; Resistance; SQUIDs; Temperature measurement; Transformer cores;
  • fLanguage
    English
  • Journal_Title
    Instrumentation and Measurement, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9456
  • Type

    jour

  • DOI
    10.1109/TIM.1987.6312684
  • Filename
    6312684
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1296496