Inductive magneto-acoustic technique for viscous fluids monitoring

The optimization of new soft hybrid materials elaborated from liquid phase needs an “on line” monitoring during the first steps of their formation. Up to date, few ultrasonic techniques ensure a complete tracking of the material characteristics. They often require a wired excitation particularly unsuited for hidden areas monitoring. This work presents an innovative magneto-ultrasonic sensor remotely controlled by an RF induction (at 100 MHz) in order to extract rheological properties of hidden complex fluids. An equivalent electrical model of the interactions between the developed wireless sensor and the complex fluid in contact is also presented. The validation study of this model using well-known viscous fluids (water-glycerol mixtures) is furthermore achieved.