Such closed flux paths minimise coupling between the drive and sense windings.
2.
Active current feedback may also be employed, such that the sense winding is driven to counteract the external field.
3.
This helps to counter inherent non-linearity between the applied external field strength and the flux gated through the sense winding.
4.
Phase synchronous detection is used to extract these harmonic signals from the sense winding and convert them into a DC voltage proportional to the external magnetic field.
5.
These factors include the number of turns in the sense winding, magnetic permeability of the core, sensor geometry, and the gated flux rate of change with respect to time.
6.
In the presence of an external magnetic field, with the core in a highly permeable state, such a field is locally attracted or gated ( hence the name fluxgate ) through the sense winding.
7.
This continuous gating of the external field in and out of the sense winding induces a signal in the sense winding, whose principal frequency is twice that of the drive frequency, and whose strength and phase orientation vary directly with the external field magnitude and polarity.
8.
This continuous gating of the external field in and out of the sense winding induces a signal in the sense winding, whose principal frequency is twice that of the drive frequency, and whose strength and phase orientation vary directly with the external field magnitude and polarity.
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