Sensitivity and noise of parallel fluxgate sensor with amorphous wire cores

Abstract

Fluxgate sensors are vectorial magnetic field sensors suitable for the measurement of fields up to mT with maximum pT resolution. Due to their low weight, low power, and low cost, fluxgates are ideal sensors to monitor the Earth’s field and measure its spatial deviations. The sensitivity of the sensor directly depends on the material and geometry of the core, and on the geometric parameters of the coils. Fluxgate is still the most sensitive room-temperature vectorial magnetic field sensor [1]. This work is devoted to the study of parallel fluxgate with multiple wire cores. The achieved sensitivity for a 35 mm long sensor is 12 mV/µT and the minimum noise was 2350 pT/√Hz at 1 Hz for as-cast amorphous wires.