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MAGNETOMETERS

Overview of function

Magnetometers are devices used to direct sense the local magnetic field, and in space navigation are used to characterize and to measure solar and planetary magnetospheres and other magnetic phenomena. These sensors are however susceptible to interference from onboard magnetic (and therefore electronic) fields, on small craft it may be necessary to shield the instrument and to position it away from the craft, for example on the end of tether. On larger spacecraft, ‘magnetically quiet’ regions of the spacecraft structure are used, though again physical distance from the craft provides the most sensitive and accurate readings. Most magnetometers detect the induction caused through cutting magnetic flux, most small scale instruments are for this reason rotated (optomechanically, no electric motors allowed) to better detect the field, and to save the spacecraft from having to rotate to detect field.
 

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