The Fluxgate Ring-Core Internal Field

Fritz Primdahl, Peter Brauer, José M.G. Merayo, Otto V Nielsen

Research output: Contribution to journalJournal articlepeer-review


A large number of measured demagnetizing factors for fluxgate ring cores of a wide range of cross section shapes have been compiled from the literature and plotted against the core cross-sectional area over the squared mean core diameter. The points group close to a straight line through the origin. The local demagnetizing factor is used, and the conversion to the average or global factor is derived. Three approximate analytical/numerical calculations of the internal field in the ring-core magnetic material are made. The results are close to the experimental data, supporting the conclusion that the demagnetizing factor for thin rings is proportional to the ring cross-sectional area divided by the diameter squared.
Original languageEnglish
JournalMeasurement Science and Technology
Issue number8
Pages (from-to)1248-1258
Publication statusPublished - 2002


  • fluxgate magnetometer
  • vector magnetic field
  • magnetic field monitoring


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