Sideband sensitivity of fluxgate sensors theory and experiment

Abstract The relationship between electronic properties of racetrack fluxgate and the second harmonic sideband sensitivity of the sensor alone without electronics is discussed in this paper. We propose a new approach to calculate the sideband sensitivity based on inductance measurements of the fluxgate coils. In this approach, we take the current-dependent mutual inductance between primary and secondary coil into account. To calculate the sensitivity, the inductance and its current dependence are measured and fitted using the provided model. The results show the validity of the approach and can describe the output signal and sensitivity of the fluxgate sensor alone, separating it from influences of the electronics. This approach makes the separable optimization of fluxgate sensor and its electronics possible.

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