A Portable Single Axis Magnetic Gradiometer

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

Research output: Contribution to journalJournal articleResearchpeer-review


The single axis magnetic gradiometer based on two compact detector compensation (CDC) fluxgate ringcore sensors separated 20 cm is described. Despite its high stability and precision better than 1 nT, the calibration procedures are not straightforward. Firstly, the mono-axial measurement does not provide vector information about the magnetic field. Secondly, one of the sensors measures the ambient magnetic field and is used to compensate for the main field at both sensors. Several methods have been developed for characterization of the 2 gradiometer, and the calibration of the gradient measurements is achieved by using a magnetic dipole of strength 2 mAm(2). In a coil facility, the gradient can be determined with an accuracy of 0.3 nT/m(RMS).
Original languageEnglish
JournalSensors and Actuators A: Physical
Issue number3
Pages (from-to)185-196
Publication statusPublished - 2001


  • fluxgate sensor
  • calibration
  • magnetic gradient


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