The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Stefan Catheline - One of the best experts on this subject based on the ideXlab platform.

  • capturing the shear and secondary compression waves high frame rate ultrasound imaging in saturated foams
    Physical Review Letters, 2019
    Co-Authors: Johannes Aichele, Bruno Giammarinaro, Michael Reinwald, Le G Moign, Stefan Catheline
    Abstract:

    We experimentally observe the shear and secondary compression waves inside soft porous water-saturated melamine foams by high-frame-rate ultrasound imaging. Both wave speeds are supported by the weak frame of the foam. The first and second compression waves show opposite polarity, as predicted by Biot Theory. Our experiments have direct implications for medical imaging: melamine foams exhibit a similar microstructure as lung tissue. In the future, combined shear wave and slow compression wave imaging might provide new means of distinguishing malignant and healthy pulmonary tissue.

Renato Torre - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic phenomena in porous media studied by transient grating spectroscopy: A critical test of the Biot Theory
    EPL (Europhysics Letters), 2008
    Co-Authors: Andrea Taschin, Riccardo Cucini, Paolo Bartolini, Renato Torre
    Abstract:

    Acoustic-wave propagation in liquid-filled porous glasses has been studied by a heterodyne detected transient grating experiment. A test of the Biot Theory is presented under two new regimes, namely, for a new frequency range up to 1.3 GHz and for porous media with nanometric scale heterogeneities. We show that the Biot Theory describes the sound velocity data correctly, but does not account for the acoustic attenuation. We suggest that the acoustic damping is mainly due to the dissipation mechanisms intrinsic of the matrix and the liquid which are not accounted for in the Theory.

  • Acoustic phenomena in porous media studied by transient grating spectroscopy: a critical test of the Biot Theory
    The Journal of the Acoustical Society of America, 2008
    Co-Authors: Riccardo Cucini, Andrea Taschin, Paolo Bartolini, Renato Torre
    Abstract:

    The propagation of sound in a porous solid filled by a liquid can be described by a phenomenological model introduced by M. A. Biot, that is still extensively used to predict the essential acoustic properties of a wide variety of porous media. Nevertheless testing of the Biot Theory at ultra/hypersonic frequencies and in porous media with nanometric scale heterogeneities remains an open issue. We studied the propagation of acoustic waves in two liquid‐filled porous glasses by heterodyne detected transient grating experiments [1]. A test of the Biot Theory is presented under two new regimes, namely, for a new frequency range up to 1.3 GHz and for porous media with nanometric scale heterogeneities [2]. We show that the Biot Theory describes the sound velocity data correctly, but does not account for the acoustic attenuation. We suggest that the acoustic damping is mainly due to the dissipation mechanisms intrinsic of the matrix and the liquid which are not accounted for in the Theory. [1] Time‐resolved spec...

  • acoustic phenomena in filled porous glasses by time resolved spectroscopy
    European Physical Journal-special Topics, 2007
    Co-Authors: Riccardo Cucini, Andrea Taschin, C Ziparo, Paolo Bartolini, Renato Torre
    Abstract:

    We studied the propagation of ultrasonic acoustic waves in two porous glasses characterized by different pore diameters (4 and 200 nm) filled with carbon tetrachloride. Using a time-resolved optical spectroscopic technique (Transient Grating) we can measure the acoustic dynamics of these systems. The sound velocities, measured in both the samples, show high values compared with the sound velocity of bulk carbon tetrachloride; they cannot be predicted by the simple effective medium model, but are in good agreement with the estimate obtained from the Biot Theory.

Johannes Aichele - One of the best experts on this subject based on the ideXlab platform.

  • capturing the shear and secondary compression waves high frame rate ultrasound imaging in saturated foams
    Physical Review Letters, 2019
    Co-Authors: Johannes Aichele, Bruno Giammarinaro, Michael Reinwald, Le G Moign, Stefan Catheline
    Abstract:

    We experimentally observe the shear and secondary compression waves inside soft porous water-saturated melamine foams by high-frame-rate ultrasound imaging. Both wave speeds are supported by the weak frame of the foam. The first and second compression waves show opposite polarity, as predicted by Biot Theory. Our experiments have direct implications for medical imaging: melamine foams exhibit a similar microstructure as lung tissue. In the future, combined shear wave and slow compression wave imaging might provide new means of distinguishing malignant and healthy pulmonary tissue.

Andrea Taschin - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic phenomena in porous media studied by transient grating spectroscopy: A critical test of the Biot Theory
    EPL (Europhysics Letters), 2008
    Co-Authors: Andrea Taschin, Riccardo Cucini, Paolo Bartolini, Renato Torre
    Abstract:

    Acoustic-wave propagation in liquid-filled porous glasses has been studied by a heterodyne detected transient grating experiment. A test of the Biot Theory is presented under two new regimes, namely, for a new frequency range up to 1.3 GHz and for porous media with nanometric scale heterogeneities. We show that the Biot Theory describes the sound velocity data correctly, but does not account for the acoustic attenuation. We suggest that the acoustic damping is mainly due to the dissipation mechanisms intrinsic of the matrix and the liquid which are not accounted for in the Theory.

  • Acoustic phenomena in porous media studied by transient grating spectroscopy: a critical test of the Biot Theory
    The Journal of the Acoustical Society of America, 2008
    Co-Authors: Riccardo Cucini, Andrea Taschin, Paolo Bartolini, Renato Torre
    Abstract:

    The propagation of sound in a porous solid filled by a liquid can be described by a phenomenological model introduced by M. A. Biot, that is still extensively used to predict the essential acoustic properties of a wide variety of porous media. Nevertheless testing of the Biot Theory at ultra/hypersonic frequencies and in porous media with nanometric scale heterogeneities remains an open issue. We studied the propagation of acoustic waves in two liquid‐filled porous glasses by heterodyne detected transient grating experiments [1]. A test of the Biot Theory is presented under two new regimes, namely, for a new frequency range up to 1.3 GHz and for porous media with nanometric scale heterogeneities [2]. We show that the Biot Theory describes the sound velocity data correctly, but does not account for the acoustic attenuation. We suggest that the acoustic damping is mainly due to the dissipation mechanisms intrinsic of the matrix and the liquid which are not accounted for in the Theory. [1] Time‐resolved spec...

  • acoustic phenomena in filled porous glasses by time resolved spectroscopy
    European Physical Journal-special Topics, 2007
    Co-Authors: Riccardo Cucini, Andrea Taschin, C Ziparo, Paolo Bartolini, Renato Torre
    Abstract:

    We studied the propagation of ultrasonic acoustic waves in two porous glasses characterized by different pore diameters (4 and 200 nm) filled with carbon tetrachloride. Using a time-resolved optical spectroscopic technique (Transient Grating) we can measure the acoustic dynamics of these systems. The sound velocities, measured in both the samples, show high values compared with the sound velocity of bulk carbon tetrachloride; they cannot be predicted by the simple effective medium model, but are in good agreement with the estimate obtained from the Biot Theory.

Riccardo Cucini - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic phenomena in porous media studied by transient grating spectroscopy: A critical test of the Biot Theory
    EPL (Europhysics Letters), 2008
    Co-Authors: Andrea Taschin, Riccardo Cucini, Paolo Bartolini, Renato Torre
    Abstract:

    Acoustic-wave propagation in liquid-filled porous glasses has been studied by a heterodyne detected transient grating experiment. A test of the Biot Theory is presented under two new regimes, namely, for a new frequency range up to 1.3 GHz and for porous media with nanometric scale heterogeneities. We show that the Biot Theory describes the sound velocity data correctly, but does not account for the acoustic attenuation. We suggest that the acoustic damping is mainly due to the dissipation mechanisms intrinsic of the matrix and the liquid which are not accounted for in the Theory.

  • Acoustic phenomena in porous media studied by transient grating spectroscopy: a critical test of the Biot Theory
    The Journal of the Acoustical Society of America, 2008
    Co-Authors: Riccardo Cucini, Andrea Taschin, Paolo Bartolini, Renato Torre
    Abstract:

    The propagation of sound in a porous solid filled by a liquid can be described by a phenomenological model introduced by M. A. Biot, that is still extensively used to predict the essential acoustic properties of a wide variety of porous media. Nevertheless testing of the Biot Theory at ultra/hypersonic frequencies and in porous media with nanometric scale heterogeneities remains an open issue. We studied the propagation of acoustic waves in two liquid‐filled porous glasses by heterodyne detected transient grating experiments [1]. A test of the Biot Theory is presented under two new regimes, namely, for a new frequency range up to 1.3 GHz and for porous media with nanometric scale heterogeneities [2]. We show that the Biot Theory describes the sound velocity data correctly, but does not account for the acoustic attenuation. We suggest that the acoustic damping is mainly due to the dissipation mechanisms intrinsic of the matrix and the liquid which are not accounted for in the Theory. [1] Time‐resolved spec...

  • acoustic phenomena in filled porous glasses by time resolved spectroscopy
    European Physical Journal-special Topics, 2007
    Co-Authors: Riccardo Cucini, Andrea Taschin, C Ziparo, Paolo Bartolini, Renato Torre
    Abstract:

    We studied the propagation of ultrasonic acoustic waves in two porous glasses characterized by different pore diameters (4 and 200 nm) filled with carbon tetrachloride. Using a time-resolved optical spectroscopic technique (Transient Grating) we can measure the acoustic dynamics of these systems. The sound velocities, measured in both the samples, show high values compared with the sound velocity of bulk carbon tetrachloride; they cannot be predicted by the simple effective medium model, but are in good agreement with the estimate obtained from the Biot Theory.