EVALUATION OF ULTRASONIC VELOCITY AND ATTENUATION BY PROCESSING THE ELECTRIC IMPEDANCE OF AN INSERTED PIEZOELECTRIC CERAMIC - APPLICATION TO CHARACTERIZATION OF POLYMER MATERIALS

An original ultrasonic method for characterizing materials is describe d here. This method is based on processing the electric impedance due to the thickness deformation of a piezoelectric disk in contact with t he material to be investigated. As derailed in previous papers such a parameter may be modelized using a one-dimensional analytical model. T hen using the analytical relation for the electric impedance and the d ata experimentally obtained, we develop the same signal processing tre atments to determine the acoustic properties (ultrasonic velocity and attenuation) of the medium in contact with the piezoelectric disk. Fin ally, the validity of this method is shown by confronting the results thus obtained with the data given in the literature.