Underwater acoustic sensing using the geometric phase

Trevor D Lata; Pierre A Deymier; Keith Runge; Glen S Uehara; Todd M W Hodges

doi:10.1121/10.0022322

Underwater acoustic sensing using the geometric phase

J Acoust Soc Am. 2023 Nov 1;154(5):2869-2877. doi: 10.1121/10.0022322.

Authors

Trevor D Lata¹, Pierre A Deymier^{1

2}, Keith Runge^{1

2}, Glen S Uehara³, Todd M W Hodges³

Affiliations

¹ Department of Materials Science and Engineering, The University of Arizona, Tucson, Arizona 85721, USA.
² New Frontiers of Sound Science and Technology Center, The University of Arizona, Tucson, Arizona 85721, USA.
³ General Dynamics Mission Systems, 8220 East Roosevelt Street, Scottsdale, Arizona 85257, USA.

PMID: 37933905
DOI: 10.1121/10.0022322

Abstract

We present a sensing modality using the geometric phase of acoustic waves propagating in an underwater environment. We experimentally investigate the effect of scattering by a small subwavelength perturbation on a flat submerged surface. We represent the state of an acoustic field in the unperturbed and perturbed cases as multidimensional vectors. The change in geometric phase is obtained by calculating the angle between those vectors. This angle represents a rotation of the state vector of the wave due to scattering by the perturbation. We perform statistical analysis to define a signal-to-noise ratio to quantify the sensitivity of the geometric phase measurement and compare it to magnitude based measurements. This geometric phase sensing modality is shown to have higher sensitivity than the magnitude based sensing approach.