Fluxgate magnetometer vector feedback homogeneity and its influence on sensor parameters

Precise fluxgate sensors are built with a vector feedback, which eliminates the cross-field effect and improves linearity. The sensor axes orthogonality should be then defined primarily by the orientation of the feedback coils while the sensitivities are defined by feedback coil constants. The influence of the homogeneity of the feedback field on calibration parameters of a vectorially compensated tri-axial fluxgate magnetometer is presented.