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Related Experiment Videos

Time reversal versus phase conjugation in a multiple scattering environment.

Arnaud Derode1, Arnaud Tourin, Mathias Fink

  • 1Laboratoire Ondes et Acoustique, Université Paris 7, ESPCI, France. arnaud.derode@espci.fr

Ultrasonics
|August 6, 2002
PubMed
Summary

Broad-band ultrasound time reversal in scattering media enables robust focusing. This technique achieves high spatial resolution, surpassing diffraction limits, and allows focusing with a single element.

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Area of Science:

  • Acoustics
  • Wave Propagation
  • Materials Science

Background:

  • Ultrasound wave propagation through complex media leads to scattering.
  • Time reversal is a technique to focus waves back to their source.
  • Understanding wave reversibility in multiple scattering is crucial for applications.

Purpose of the Study:

  • To experimentally investigate the reversibility of broadband ultrasound in a multiple scattering medium.
  • To evaluate the quality of spatial and temporal focusing achieved through time reversal.
  • To compare the effectiveness of broadband time reversal with monochromatic phase conjugation.

Main Methods:

  • Transmission of pulsed ultrasonic waves from a point source through 2D samples of steel rods in water.
  • Recording scattered waves using a 128-element receiving array.

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  • Time-reversing the recorded waves and re-transmitting them into the medium.

    • Main Results:

    • Time-reversed waves successfully converged back to the original source.
    • Robust estimation of wave correlations was achieved from a single realization of disorder.
    • Spatial resolution was limited by the correlation length of the scattered field, not diffraction.
    • Effective time-reversal focusing was demonstrated using a single element, outperforming monochromatic phase conjugation.

    Conclusions:

    • Broadband ultrasound time reversal is effective for focusing in multiple scattering environments.
    • The technique offers high spatial resolution independent of diffraction limits.
    • Single-element time reversal provides a viable alternative to array-based methods and monochromatic phase conjugation.