Spatial Filtering of Sound Beams by Sonic Crystals

TL;DR

This paper demonstrates how sonic crystals can be used to effectively filter and focus sound beams, with potential applications in acoustic signal processing and beam shaping.

Contribution

The study introduces a method for spatial filtering of sound beams using two-dimensional sonic crystals, including configurations with and without angular band-gaps.

Findings

Effective spatial filtering demonstrated through numerical simulations.

Beams can be focalized behind the sonic crystal in both configurations.

The approach works for structures modulated in both longitudinal and transversal directions.

Abstract

We propose and numerically demonstrate an efficient cleaning of spatial structure (spatial filtering) of sound beams by propagating them through at least twodimensional sonic crystals, i.e. through acoustic structures periodically modulated in longitudinal and in transversal direction with respect to the sound propagation direction. We show the spatial filtering in two configurations: with- and without the angular band-gap. We also show that besides the spatial filtering the beams can be additionally focalized at a particular distance behind the sonic crystal in both configurations.