A magnetostrictive biased magnetic field sensor with geometrically controlled full-scale range

•A magnetic field sensor based on Fe-Ga alloy and Fiber Bragg Grating is developed.•The demagnetizing field is investigated and exploited to widen the detection range.•Full quadrant field detection is achieved by a permanent magnet bias system.•A prototype has been realized by a 3D printing technolo...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2018-09, Vol.280, p.475-483
Main Authors: Apicella, V., Caponero, M.A., Davino, D., Visone, C.
Format: Article
Language:English
Subjects:
Demagnetization
Demagnetizing field effect
Ferroelectrics
Fiber Bragg Gratings
Fluids
Galfenol
Gallium base alloys
Harsh environments
Iron
Magnetic field sensors
Magnetic fields
Magnetic saturation
Magnetic shielding
Magnetostriction
Magnetostrictive materials
Permanent magnets
Sensors
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Summary:•A magnetic field sensor based on Fe-Ga alloy and Fiber Bragg Grating is developed.•The demagnetizing field is investigated and exploited to widen the detection range.•Full quadrant field detection is achieved by a permanent magnet bias system.•A prototype has been realized by a 3D printing technology.•The approach is suitable for field sensing based on other multifunctional materials. A magnetic field sensor prototype is developed and tested in this work. The device exploits a Galfenol rod, i.e. a giant magnetostrictive Iron-Gallium alloy, integrated with a Fiber Bragg Grating. In particular, the full-scale range of the sensor can be modulated through the exploitation of the geometrically dependent effect of the demagnetizing field. Indeed, it pushes toward higher fields the magnetic saturation by producing a sort of magnetic shield in the material. As a consequence, the geometrical viewpoint is included into the frame of the entire design process, with the aim of investigate how it influences the detectability range and the performance of the sensor. Furthermore, a permanent magnet system providing a DC bias magnetic field has been designed and exploited to allow the device to be able to measure both negative and positive magnetic fields.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2018.08.014