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Diffusing acoustic wave spectroscopy.

M L Cowan1, I P Jones, J H Page

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 22, 2002
PubMed
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We developed diffusing acoustic wave spectroscopy (DAWS) to measure particle motion using sound fluctuations. This ultrasonic technique quantifies particle velocity and strain in suspensions, with broad applications in materials science and geophysics.

Area of Science:

  • Acoustics
  • Materials Science
  • Geophysics

Background:

  • Ultrasonic correlation spectroscopy analyzes temporal fluctuations of scattered sound to understand material dynamics.
  • Characterizing the motion of scatterers in complex media is crucial for various scientific and industrial applications.

Purpose of the Study:

  • To introduce and validate diffusing acoustic wave spectroscopy (DAWS) as a novel technique for measuring scatterer dynamics using ultrasonic waves.
  • To establish the theoretical framework relating acoustic field fluctuations to particle motion and correlations.

Main Methods:

  • Developed DAWS, a technique employing multiply scattered sound and diffusion approximation to analyze temporal field fluctuations.
  • Derived expressions linking the temporal field autocorrelation function to the correlated motions of scatterers.

Related Experiment Videos

  • Applied DAWS to fluidized particle suspensions to measure local relative velocity and strain rates.

    • Main Results:

    • DAWS successfully measured local relative velocity and strain rates of suspended particles across diverse time and length scales.
    • Combined DAWS with dynamic sound scattering to determine the spatial extent of particle velocity correlations.
    • Demonstrated the ability to indirectly measure particle velocity correlation functions.

    Conclusions:

    • DAWS offers a sensitive method for probing the dynamics of multiply scattering media using ultrasound.
    • The technique has significant potential for ultrasonic nondestructive evaluation of inhomogeneous materials.
    • DAWS can be applied to geophysical studies, particularly for analyzing mesoscopic phenomena in seismology.