Spectrally-wide acoustic frequency combs generated using oscillations of polydisperse gas bubble clusters in liquids

TL;DR

This paper introduces a novel method for generating wide-spectrum acoustic frequency combs using oscillations of polydisperse gas bubble clusters in liquids, with potential applications in high-precision sensing in challenging environments.

Contribution

It proposes a new approach to create spectrally-wide acoustic combs through controlled bubble cluster oscillations, demonstrated via numerical simulations.

Findings

Wide acoustic spectra with equally-spaced peaks achieved

Bubble clusters remain stable over relevant timescales

Spectral properties tunable by adjusting bubble size and number

Abstract

Acoustic frequency combs leverage unique properties of the optical frequency comb technology in high-precision measurements and innovative sensing in optically inaccessible environments such as under water, under ground or inside living organisms. Because acoustic combs with wide spectra would be required for many of these applications but techniques of their generation have not yet been developed, here we propose a new approach to the creation of spectrally-wide acoustic combs using oscillations of polydisperse gas bubble clusters in liquids. By means of numerical simulations we demonstrate that clusters consisting of bubbles with precisely controlled sizes can produce wide acoustic spectra composed of equally-spaced coherent peaks. We show that under typical experimental conditions bubble clusters remain stable over time required for a reliable recording of comb signals. We also demonstrate that the spectral composition of combs can be tuned by adjusting the number and size of bubbles in a cluster.