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Subcritical scattering from buried elastic shells.

Irena Lucifredi1, Henrik Schmidt

  • 1Department of Ocean Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of the Acoustical Society of America
|January 18, 2007
PubMed
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Detecting buried objects with sonar is challenging. This study reveals how sediment affects acoustic signatures, showing structural waves can reveal submerged elastic targets.

Area of Science:

  • Underwater acoustics
  • Geophysical exploration
  • Sonar technology

Background:

  • Traditional high-frequency sonars struggle with buried object detection due to limited penetration.
  • Low-frequency sonar offers an alternative but requires different classification methods for buried targets.

Purpose of the Study:

  • To analyze sediment and seabed interface effects on sound scattering from buried elastic shells.
  • To understand acoustic signature differences between buried and proud targets.

Main Methods:

  • Focused array processing of GOATS98 experimental data.
  • Hybrid modeling combining virtual source approach with spectral integral Green's functions for stratified waveguides.
  • Incorporation of multiple scattering between object and seabed.

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Main Results:

  • Demonstrated significant role of structural circumferential waves in scattering.
  • Showcased conversion of evanescent waves to backscattered body waves at supercritical angles.
  • Observed that targets appear closer to sonar than predicted by traditional ray theory.

Conclusions:

  • Sediment and seabed proximity significantly alter acoustic scattering from buried elastic shells.
  • Structural waves are key to detecting submerged targets by converting evanescent to body waves.
  • Findings challenge traditional sonar interpretations for buried object detection.