Design of magnetoelastic transducers

Magnetoelastic transducers are classed among inductive transducers in which the relative permeability of ferromagnetic materials suffers changes under the effect of mechanical load. The change (always of anisotropic character) in the relative permeability results in a change in the impedance of the coil located in the transducer and, in case of several coils, a change in the transfer impedance as well. This paper describes the phases of planning the magnetoelastic transducers in detail, starting from the mechanical load up to the electric output signal. For the planning, the knowledge of the magnetoelastic sensitivity parameters is of fundamental importance, in addition to the estimation of the mechanical stress conditions and the electromagnetic field. The paper describes the method of determining these sensitivity parameters as material constants and their values for certain magnetoelastic materials