Design of an Acoustic Resonance Interferometer for Velocity and Absorption Evaluation of Liquids

This work presents an overview of the theory and experimental method used in an acoustic spectrometer developed to operate in a frequency range of tens of MHz. This study investigates the absorption and propagation of sound waves in liquids. The methodology involves the analysis of stationary sound waves inside a resonant cavity filled with the liquid of interest. The acoustic resonator uses identical ultrasonic transducers positioned at the ends of the cavity. By examining the frequency and bandwidth of the resonance peaks, we obtained crucial information about the acoustic properties of the liquid. Experiments conducted with ultrapure water at a specific temperature show the method's effectiveness in determining parameters such as speed of sound, resonance frequency, attenuation, and the relaxation time of the molecule. These discoveries, which significantly contribute to a deeper understanding of molecular processes in liquids, underscore the practical utility of acoustic spectroscopy in various scientific disciplines.