MAGNETOSTRICTIVE FORCE AND DISPLACEMENT SENSOR

L. Mehnen., E. Kaniusas, E. Leiss, H. Pfützner

Abstract

The present work concerns the application of magnetostrictive soft magnetic amorphous ribbons for the detection of displacements or weak forces. The principle of signal generation is based on permeability changes as a result of mechanical stress acting in band direction. The elastic band is fixed at one end while the second one is displaced or loaded normal to the band axis. For high sensitivity, a bimetal band is used which comprises a non-magnetic carrier ribbon in addition to the magnetic ribbon. The sensitivity can be increased by increased thickness of the carrier ribbon. Further it can be optimized by pre-magnetization and by specifically adjusted measurement frequency. The low-cost, low-mass sensor allows to detect forces down to about 1 mN.

Keywords

magnetic materials, magnetostriction, force sensors, displacement sensors

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IMEKO-WC-2000-TC13-P337.pdf

DOI

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IMEKO TC

TC13 - Measurements in Biology and Medicine

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