Dispositivo eletrônico para medição da frequência de ressonância de sensores magnetoelásticos

Abstract

Magnetoelastic sensors have a wide range of applications due in large part to the possibility of making their instrumentation wireless. These sensors can measure several physical quantities, such as pressure and mass, and also monitor chemical and biological reactions. These sensors' principle of operation relies on the magnetostrictive property of some amorphous metallic alloys. When exposed to a variable magnetic field, a magnetoelastic material undergoes longitudinal dimensional oscillations with a frequency equals to that of the applied AC field. Resonance occurs when the field frequency is equal to the natural vibrational frequency of the material, the value of which depends on the sensor's dimensions and mass. The objective of this work was the construction of a portable device capable of measuring the resonance frequency of magnetoelastic sensors. The device built was validated against a commercial equipment and presented excellent results, particularly considering its simplicity, low development cost and easy operation. [resumo fornecido pelo autor]