A high-Q easy-to-handle biconcave resonator for acoustic spectrometry of liquids

Abstract

Ultrasonic resonator cells for liquid attenuation and sound velocity measurements down to 70 kHz are described. The resonators are provided with easy-to-obtain concavely shaped shaving mirrors as acoustic reflectors and separated piezoelectric devices for the coupling of the cell to the electronic set-up. The advantages of this construction are shown. The mode spectrum of the resonators is discussed and measurement and evaluation procedures, also considering higher-order satellite peaks, are presented. Possible sources of experimental errors are specified and examples of measurements are given to illustrate the favourable performance of the cell design.