Experimental characterization of rigid scatterer hyperuniform distributions for audible acoustics

TL;DR

This study experimentally investigates how hyperuniform distributions of rigid scatterers influence wave transport in audible acoustics, revealing regimes like transparent regions and band gaps, and assessing their robustness to losses.

Contribution

It provides the first experimental characterization of hyperuniform scatterer distributions in audible acoustics, linking geometric patterns to transport properties and identifying different scattering regimes.

Findings

Identification of transparent regions, band gaps, and anisotropic scattering regimes.

Demonstration of robustness of scattering regimes to acoustic losses.

Experimental validation of theoretical predictions for hyperuniform distributions.

Abstract

Two-dimensional stealthy hyperuniform distributions of rigid scatterers embedded in a waveguide are experimentally characterized the wave transport properties for scalar waves in airborne audible acoustics. The non resonant nature of the scatterers allows us to directly links the these properties to the geometric distribution of points through the structure factor. The transport properties are analyzed as a function of the stealthiness $\chi$ of their hyperuniform point pattern and compared to those of a disordered material in the diffusive regime, which are characterized by the Ohm's law through the mean free path. Different scattering regimes are theoretically and numerically identified showing transparent regions, isotropic band gaps, and anisotropic scattering depending on $\chi$. The robustness of these scattering regimes to losses which are unavoidable in audible acoustics is experimentally unvealed.