A new design of automated piezoelectric composite oscillator technique

We describe the latest design of the automated piezoelectric ultrasonic composite oscillator technique, which has traditionally been used for the measurements of elastic and anelastic properties of solids at frequencies of 70–140 kHz in a continuous positive feedback mode. The new equipment features several substantial advantages, as compared to previous constructions, owing to the application of up-to-date data acquisition units and microelectronics components.