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Underwater acoustic sensing using the geometric phase.

Trevor D Lata1, Pierre A Deymier1,2, Keith Runge1,2

  • 1Department of Materials Science and Engineering, The University of Arizona, Tucson, Arizona 85721, USA.

The Journal of the Acoustical Society of America
|November 7, 2023
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Summary
This summary is machine-generated.

This study introduces a novel underwater acoustic sensing method using geometric phase. This technique offers higher sensitivity for detecting subwavelength perturbations compared to traditional magnitude-based measurements.

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Area of Science:

  • Acoustics
  • Wave physics
  • Sensing technologies

Background:

  • Underwater environments present challenges for acoustic sensing.
  • Detecting small perturbations requires high-sensitivity methods.
  • Geometric phase is an underexplored property of acoustic waves for sensing.

Purpose of the Study:

  • To introduce and validate a novel sensing modality based on acoustic wave geometric phase.
  • To experimentally investigate the sensitivity of geometric phase sensing to subwavelength perturbations.
  • To compare the performance of geometric phase sensing with traditional magnitude-based sensing.

Main Methods:

  • Acoustic waves were propagated in an underwater environment.
  • The effect of subwavelength perturbations on a submerged surface was studied.
  • Acoustic field states were represented as multidimensional vectors.
  • The change in geometric phase was quantified by the angle between state vectors.
  • Statistical analysis was used to determine signal-to-noise ratio and compare sensing methods.

Main Results:

  • Geometric phase measurements quantify wave rotation caused by scattering.
  • A signal-to-noise ratio was defined to assess measurement sensitivity.
  • Geometric phase sensing demonstrated higher sensitivity than magnitude-based sensing for detecting perturbations.

Conclusions:

  • Geometric phase sensing is a promising high-sensitivity modality for underwater applications.
  • This method offers advantages over conventional amplitude-based acoustic sensing.
  • The technique has potential for detecting small features in submerged environments.