title: Removal of earth's magnetic field effect on magnetoelastic resonance sensors by an antisymmetric bias field.
abstract: Magnetoelastic sensors are used in a wide field of wireless sensing applications. The sensing element is a low-cost magnetostrictive ribbon whose resonant frequency depends on the measured quantity. The accuracy of magnetoelastic sensors is limited by the fact that the resonant frequency is also affected by the earth's magnetic field. In this paper we present a technique to minimize this effect by applying an antisymmetric magnetic bias field to the ribbon. The ribbon's response to external perturbation fields was measured and compared to a conventional sensor design. Our results show that the influence of the earth's magnetic field could be reduced by 77%.
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8, 1040 Wien, Austria ; Institute of Analysis and Scientific Computing, Vienna University of Technology, Wiedner Hauptstr. 8, 1040 Wien, Austria.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Bergmair
authors.forename: Thomas
authors.initials: T
authors.lastname: Huber
authors.forename: Florian
authors.initials: F
authors.lastname: Bruckner
authors.forename: Christoph
authors.initials: C
authors.lastname: Vogler
authors.forename: Dieter
authors.initials: D
authors.lastname: Suess
keywords: Antisymmetric bias field; Compensation; Earth's magnetic field; Magnetoelastic resonance sensor; Passive sensor; Remote measurement
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