Vector feedback is a concept which can significantly improve linearity and stability of a magnetic field sensor. The feedback coils effectively cancel the measured magnetic field in the inner volume of the triaxial sensor. Thus, in case of fluxgates, it suppresses one possible source of nonlinearity—cross-field sensitivity error. The triaxial sensor axes orthogonality should be primarily defined 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 and the influence of the sensor inner layout on calibration parameters of a vectorially compensated triaxial fluxgate magnetometer are presented.
CitationPetrucha, V., Janosek, M., Azpúrua, M. Vector feedback homogeneity and inner layout influence on fluxgate sensor parameters. "IEEE transactions on instrumentation and measurement", Maig 2015, vol. 64, núm. 5, p. 1293-1299.
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