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Title: Sensitivity and noise of wire-core transverse fluxgate
Authors: Ripka, P.
Butta, M.
Jie, F. 
Li, X. 
Keywords: Magnetic wires
Microwire array
Orthogonal fluxgate
Issue Date: Feb-2010
Citation: Ripka, P., Butta, M., Jie, F., Li, X. (2010-02). Sensitivity and noise of wire-core transverse fluxgate. IEEE Transactions on Magnetics 46 (2) : 654-657. ScholarBank@NUS Repository.
Abstract: Fluxgate sensors with cores made of amorphous microwire have low sensitivity due to the small cross-sectional area of the wire. Previous studies with multiwire cores have shown nonlinear increase of sensitivity with number of wires, which was explained by interaction between the wires. In this study, we show that the anomalous increase of sensitivity cannot be explained neither by exchange coupling nor by magnetostatic interaction, but by change in parametric amplification caused by change of the quality factor of the resonant circuit. Interactions between the wires may cause hysteresis effects; therefore, we recommend to keep the wires in distance. Optimization of the pick-up coil geometry may significantly increase the sensitivity and, thus, reduce the magnetic field noise. Using four wires in parallel, we reached a noise level of 120 pT/√Hz@1 Hz for a 10-mm-long sensor excited by a 20-mA current. © 2010 IEEE.
Source Title: IEEE Transactions on Magnetics
ISSN: 00189464
DOI: 10.1109/TMAG.2009.2033554
Appears in Collections:Staff Publications

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