Piezoelectric transducers are widely used in ultrasonic technology to excite the desired wave modes into a specimen in order to detect flaws and to assess its reliability. Even though they have been used for quite a long time, there is still a a great deal of possible innovations. In particular recent researches on thickness shear transducers for guided wave applications have indicated the necessity to miniaturize the transducers to enhance the performance of the inspections.
Furthermore, as far as thickness shear transducers are concerned, there is a need to understand the interaction among all the physical parameters involved. In particular a study on the transfer function is requested. As a matter of fact, the multiphysics of those devices seem to be not completely understood.
Thus, in order to improve the capability of transducers, a physical insight is desirable. In this research computational models and experimental validations will be carried out bringing to a more precise evaluation of the physical parameters of the transducers. Therefore, a new transfer function will be proposed.
In a second step the transfer function will be applied in order to
indicate which constraints have to be modified to reach the goal of
miniaturisation. The hypothesis will be tested on defined waveguides
and will be compared with the performance of the transducers used
at the present moment.