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$Interference and Diffraction$ 02:18

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Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Rough surface scattering in a Born approximation from a two-way coupled-mode formalism.

Steven A Stotts¹, Robert A Koch

¹Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713-8029, USA. stotts@arlut.utexas.edu

The Journal of the Acoustical Society of America

|June 11, 2009

Summary

This study presents a new method for analyzing surface scattering in ocean waveguides using a coupled-mode approach. The findings offer a refined understanding of scattering phenomena in complex underwater environments.

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Area of Science:

Ocean acoustics
Waveguide theory
Surface scattering

Background:

Understanding acoustic wave propagation in ocean waveguides is crucial for underwater applications.
Surface roughness significantly impacts acoustic scattering, complicating propagation models.
Existing models often simplify scattering effects, necessitating more comprehensive approaches.

Purpose of the Study:

To derive a new formalism for scattering from rough surfaces in ocean waveguides.
To analyze scattering effects to all orders using a two-way coupled-mode representation.
To investigate both two- and three-dimensional waveguide geometries.

Main Methods:

Developed a two-way coupled-mode representation for scattering analysis.
Truncated the general formalism to first-order terms of an iterative (Born) expansion.
Reduced mode functions to plane wave reflection coefficients.

Main Results:

The derived scattering kernel's off-diagonal components align with standard solutions.
A novel finding is the difference in the diagonal components compared to standard solutions.
The formalism accommodates both 2D and 3D ocean waveguide geometries.

Conclusions:

The new derivation provides a more detailed description of surface scattering in ocean waveguides.
The identified differences in diagonal components warrant further investigation for improved acoustic modeling.
This work contributes to a more accurate understanding of acoustic interactions with ocean surfaces.