Abstract
Abstract The dependence of the magnetic properties of some ferromagnetic materials on mechanical stresses is utilized in magnetoelastic force sensors. The materials used in such sensors should combine magnetic softness with a large tensile strength. Amorphous metal alloys match these demands and allow force sensors to be created which are distinguished by an uncomplicated and robust construction. The material is available in the form of thin ribbons with a thickness of about 25 μm. Sensors for tensional stresses can consist of one single metal ribbon and a set of coils. By means of mechanical leverage, sensors for compressive forces can also be realized. By piling up many thin ribbons, compacts are fabricated which could be used directly as compressive force sensors. The criteria for the selection of the materials and the pretreatments are given. Special signal processing and uncomplicated active shielding reduce the influence of interfering magnetic fields to less than 0.1%.
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