A magnetoelastic viscosity sensor

In response to a time varying magnetic field magnetostrictive materials demonstrate a magnetoelastic resonance the frequency of which is dependent upon the material density, applied static field. Young's modulus, and physical dimensions. Earlier applications of such materials have included using them as identification markers 113, or stress sensors [2] where applied stress changed the remnant frequency of the sensor. Fig. I is an illustrative figure showing the voltage measured for a thin magnetostrictive sample as a function of applied field frequency.