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Differential magntoelastic compressive force sensor utilizing two amorphous alloy ring cores

Adam Bieńkowski 1Roman Szewczyk 1Jacek Salach 1Roman Kolano 2

1. Warsaw University of Technology, Faculty of Mechatronics, Św. Andrzeja Boboli 8, Warszawa 05-525, Poland
2. Institute of Nonferrous Metals, Sowińskiego 5, Gliwice 44-100, Poland


Magnetoelastic effect can be observed as changes of permeability of soft magnetic material subjected to stresses generated by external forces. This effect can be used for development of high sensitivity stress and force sensors for industrial applications.

Paper presents results of investigation on functional characteristics of magnetoelastic compressive force sensor utilizing two Fe81Si4B15 amorphous alloy ring-shaped cores. Uniform distribution of stresses in core was achieved due to special non-magnetic backings. Signal from sensing coils of cores was connected to differential amplifier, whereas sine wave voltage signal was applied to magnetizing circuit.

Result of investigation indicated, that differential configuration enable to reduce temperature sensitivity of magnetoelastic sensor. Moreover high stress sensitivity of developed sensor was indicated. These results confirm, that differential configuration of magnetoelastic sensor is suitable for practical application in sensors development.

This work was supported by Polish Ministry of Science and Higher Education under Grant PBZ-KBN-095/T08/2003.

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Presentation: Oral at E-MRS Fall Meeting 2008, Symposium C, by Adam Bieńkowski
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-11 20:19
Revised:   2009-06-07 00:48