title: 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.
authors.affiliation: Université Paris 6, UMR 7588 CNRS-UPMC, INSP, 4 Place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Wintzenrieth
authors.affiliation: Université Paris 6, UMR 7588 CNRS-UPMC, INSP, 4 Place Jussieu, 75252 Paris Cedex 05, France and Université Paris-Est, LPMDI, 5 Boulevard Descartes, 77454 Marne-la-Vallée, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Cohen-Addad
authors.affiliation: Université Paris 6, UMR 7588 CNRS-UPMC, INSP, 4 Place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Le Merrer
authors.affiliation: Université Paris 6, UMR 7588 CNRS-UPMC, INSP, 4 Place Jussieu, 75252 Paris Cedex 05, France and Université Paris-Est, LPMDI, 5 Boulevard Descartes, 77454 Marne-la-Vallée, France.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Höhler
mesh_terms: D003198:Computer Simulation; D055119:Elastic Modulus; D054459:Elasticity Imaging Techniques / Q000379:methods*; D006244:Hardness; D007834:Lasers; D008956:Models, Chemical; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D013016:Sound; D013057:Spectrum Analysis / Q000379:methods*; D014783:Viscosity