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Förslaget inkom 2006-08-02

Modelling and evaluation of a minituarised fluxgate sensor

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
Magnetometers are carried by most spacecraft, scientific as well as commercial. On commercial satellites the magnetometer is part of the
systems responsible for spacecraft orientation (attitude control), but are also used e.g. for geological prospecting etc. On scientific spacecraft the main interest is in the part of the field that relates
to local electric currents. The primary contribution to the magnetic field in the near-Earth space is the internal geomagnetic field, with the contributions from from ionospheric and magnetospheric currents
(e.g. related to the aurora) being ca 2 orders of magnitude smaller, requiring precision measurements of magnetic fields on scientific satellites. Of particular interest for future scientific missions are multipoint measurements, which to be feasible require a low mass of each instrument unit. Thus, the current trend in the scientific instrumentation is towards miniaturisation of the sensors.

The most commonly used principle for magnetometer measurements is the so-called fluxgate. A core of magnetic material of high permeability is periodically driven into saturation by an excitation current. Whenever the current is strong the core saturates. At these times the external magnetic field does not contribute to the magnetic flux in the core. When the excitation current goes through zero, the core magnetic flux is determined solely by the external magnetic field. Measuring the induced signal in a pickup coil around the core, the external magnetic field can be deduced.

The focus of the MSc thesis project is on numerical
modelling of the performance of a minituarised fluxgate sensor with volume compensation, and evaluation of a particular design used in the instrument for MicroLink satellite. Participation in calibrations of the actual instrument is possible.

Your interests may include: numerical simulations, electrodynamics, electronics.
Experience of working with FEMLAB will be helpful.


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