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Laser-speckle-visibility acoustic spectroscopy in soft turbid media

Abstract : We image the evolution in space and time of an acoustic wave propagating along the surface of turbid soft matter by shining coherent light on the sample. The wave locally modulates the speckle interference pattern of the backscattered light, which is recorded using a camera. We show both experimentally and theoretically how the temporal and spatial correlations in this pattern can be analyzed to obtain the acoustic wavelength and attenuation length. The technique is validated using shear waves propagating in aqueous foam. It may be applied to other kinds of acoustic waves in different forms of turbid soft matter such as biological tissues, pastes, or concentrated emulsions.
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Submitted on : Monday, December 7, 2015 - 5:28:22 PM
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Frederic Wintzenrieth, Sylvie Cohen-Addad, Marie Le Merrer, Reinhard Hoehler. Laser-speckle-visibility acoustic spectroscopy in soft turbid media. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2014, 89 (1), pp.012308. ⟨10.1103/PhysRevE.89.012308⟩. ⟨hal-01239402⟩



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