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Related Experiment Video

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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

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Acoustic Wave Reflection in Water Affects Underwater Wireless Sensor Networks.

Kaveripakam Sathish¹, Monia Hamdi², Ravikumar Chinthaginjala Venkata¹

¹School of Electronics Engineering, Vellore Institute of Technology, Vellore 632014, India.

Sensors (Basel, Switzerland)

|June 10, 2023

Summary

Acoustic wave reflection is influenced by material properties. Increased porosity and permeability shift the pseudo-Brewster angle, impacting acoustic attenuation and reflection coefficients in fluid-solid interactions.

Keywords:

acoustic waves incidence permeability reflection underwater environments

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Area of Science:

Acoustics
Materials Science
Fluid Dynamics

Background:

Acoustic wave reflection at fluid-solid interfaces is crucial for understanding material properties.
Poroelastic materials exhibit complex acoustic behaviors influenced by their physical characteristics.

Purpose of the Study:

To investigate the impact of material physical qualities on oblique incidence acoustic attenuation.
To analyze how porosity and permeability affect acoustic reflection coefficients and pseudo-Brewster angles.

Main Methods:

Generated reflection coefficient curves by varying porosity and permeability of poroelastic solids.
Modeled acoustic plane wave reflection and absorption on half-space and two-layer surfaces.
Accounted for both viscous and thermal losses in the acoustic propagation.

Main Results:

The propagation medium significantly shapes the reflection coefficient curve.
Permeability, porosity, and frequency have less impact on the pseudo-Brewster angle and reflection minima.
Increased porosity and permeability shift the pseudo-Brewster angle leftward, up to a limit of 73.4 degrees.

Conclusions:

Higher porosity leads to greater angular dependence in reflection coefficient curves and reduced magnitude.
Decreased permeability reduces the angular dependence of frequency-dependent attenuation, creating iso-porous curves.
Matrix porosity is a key factor in the angular dependency of viscous losses within specific permeability ranges.