Noise Optimization of Racetrack Fluxgate Sensors

Authors: Piel, Rainer; Ludwig, Frank; Schilling, Meinhard

Source: Sensor Letters, Volume 7, Number 3, June 2009 , pp. 317-321(5)

Publisher: American Scientific Publishers

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Abstract:

To further reduce the noise of our wire-wound racetrack fluxgate magnetometers, we systematically investigated the effect of core tape width, the number of tape wraps and of the secondary coil diameter on the apparent core permeability, the sideband sensitivity and the sensor noise. In addition, we studied in detail the individual noise contributions of the sensor and the various components of the closed-loop electronics. Values of about 100 fT/Hz1/2 have been measured as flux density noise contribution of the core. Currently, the total noise is limited by the noise from the square-wave current source in the excitation circuit.
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