A Portable Single Axis Magnetic Gradiometer

Publication: Research - peer-reviewJournal article – Annual report year: 2001

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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
Publication date2001
Volume93
Journal number3
Pages185-196
ISSN0924-4247
StatePublished

Keywords

  • fluxgate sensor, calibration, magnetic gradient
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