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Related Experiment Videos

Fringed sound fields and their interaction with liquid-solid interfaces.

Nico F Declercq1, Joris Degrieck, Oswald Leroy

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332-0405, USA. nico.declercq@me.gatech.edu

Ultrasonics
|June 24, 2006
PubMed
Summary

Fringed sound beams interacting with liquid-solid interfaces can cause backward displacement of reflected sound, unlike Gaussian beams which cause forward displacement. This study explores these unique acoustic phenomena.

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Area of Science:

  • Acoustics
  • Solid-state physics
  • Wave phenomena

Background:

  • Gaussian beams stimulate Rayleigh waves, causing the Schoch effect (lateral beam displacement) via leaky Rayleigh wave re-radiation.
  • Reflected sound from Gaussian beams typically shows two anti-phase beams.
  • Fringed sound beams, composed of neighboring anti-phase narrow beams, approximate phased array acoustics and exhibit less divergence than Gaussian beams.

Purpose of the Study:

  • To investigate the interaction of fringed sound beams with a liquid-solid interface.
  • To analyze the reflected sound patterns produced by incident fringed beams.
  • To compare the displacement effects of fringed beams with those of Gaussian beams.

Main Methods:

  • Theoretical investigation of acoustic wave propagation.

Related Experiment Videos

  • Analysis of sound fields originating from phased arrays.
  • Simulation of fringed beam interaction at a liquid-solid interface.

    • Main Results:

    • Under specific conditions, a fringed beam incident at the Rayleigh angle generates a reflected sound pattern with a single, non-fringed wide lobe.
    • Under different conditions, fringed beams exhibit a significant backward displacement of the reflected sound.
    • This backward displacement contrasts with the forward displacement observed for incident Gaussian beams.

    Conclusions:

    • Fringed beams display distinct reflection characteristics at liquid-solid interfaces compared to Gaussian beams.
    • The study reveals novel acoustic displacement phenomena associated with fringed beams.
    • Understanding these interactions is crucial for applications involving acoustic wave manipulation.