Improved ultrasonic spectroscopy methods for characterization of dispersive materials

Transmission ultrasonic spectroscopy method has been successfully implement ed for the characterization of piezoceramics at high frequencies. There are , however, still some intrinsic error sources that limit the accuracy of th e method. In this paper, two improved ultrasonic spectroscopy methods are p resented, which can reduce the number of pre-required parameters and reduce another error source. The two improved methods were used to measure the fr equency dispersion of phase velocity and attenuation of doped piezoceramic lead zirconate titanate (PZT-SA); results were compared with those obtained from the conventional method. The advantages and limitations of each metho d are discussed.