Article
Acoustics
Francine Luppe, Jean-Marc Conoir, Tony Valier-Brasier
Summary: This study investigates multiple scattering effects due to a random distribution of identical spheres in elastic or poroelastic host media, considering the coexistence of longitudinal and transverse waves. It looks for the dispersion equation of plane coherent waves, and provides analytic approximations for specific solutions close to the wavenumbers in the free host under low concentration conditions. Pair-correlation effects are found to be of second order in this scenario.
Article
Materials Science, Multidisciplinary
Or Lasri, Lea Sirota
Summary: Negative refraction is a unique wave propagation phenomenon that occurs when a wave crosses a boundary between a regular medium and a medium with negative constitutive parameters at a given frequency. We propose a temporal analogue of this phenomenon by using time-dependent media and creating an artificial temporal boundary. By switching the parameters from constant to dispersive with frequency, we demonstrate both reflection and refraction in positive and negative regimes simultaneously. We show analytically and numerically that the dynamics of this temporal analogue are different from the spatial case, and that the temporal boundary can be made nonreflecting while preserving both positive and negative refraction through targeted dispersion tuning.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Geochemistry & Geophysics
Ali Sayed, Robert R. Stewart, Dhananjay Kumar
Summary: Azimuthal vertical seismic profile (AzVSP) surveys are commonly used for fracture characterization, with fractured media producing characteristic patterns disrupted by complex structures. Anisotropy parameters have been derived to characterize AzVSP responses, showing that dry fractures produce stronger responses than fluid-filled fractures. The methodology can eliminate structural effects on AzVSP gathers, revealing underlying fracture responses even in complex overburdens.
Article
Materials Science, Multidisciplinary
F. Shi
Summary: This article investigates the variance of elastic wave scattering from randomly rough surfaces using theoretical formulae derived with the elastodynamic Kirchhoff approximation. The study provides insights into the effects of rms roughness, correlation length, and surface length on the standard deviation of the scattering amplitude, with practical implications for applications such as ultrasonic wave detection.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Civil
Shixuan Shao, Rongyu Xia, Zheng Li
Summary: This paper proposes a novel piezoelectric metasurface for simultaneously manipulating multi-mode guided waves in a plate, which has significant potential in the fields of guided wave manipulation and smart device design.
ENGINEERING STRUCTURES
(2022)
Article
Physics, Applied
Chun Min Li, Shengyuan Zhang, Haibo Chen, Wenjing Ye
Summary: As the most popular mechanism, the generalized Snell's law has been extensively used for designing metasurfaces that manipulate waves. However, it has been observed that the performance of these metasurfaces is not always determined solely by the generalized Snell's law, and sometimes the wave fields exhibit contradictory behavior. This study systematically investigates the generalized Snell's law for elastic waves through numerical simulations. The inherent assumptions of the law are examined, and the effects of various implementation issues on the metasurface performance are studied. The study also identifies and theoretically justifies the fundamental mechanism responsible for producing wave components that do not obey the generalized Snell's law, and provides design guidelines for improved metasurface performance.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Geochemistry & Geophysics
Kristopher A. Innanen
Summary: The O'Doherty-Anstey model estimates the spectrum of a seismic wave traveling and reverberating within a series of interfaces based on its reflectivity. This model uses a combinatorial calculation to weigh and count the contributing raypaths at each lag. The analysis is mapped into statistical mechanics, where raypaths represent system configurations and lag represents system energy. The resulting probabilities of wave contributions at different lags are determined by a partition function and a scattering parameter analogues to temperature. The reflectivity weighting governs the smoothness of the continuous phase transition observed in the average contributing lag.
Article
Multidisciplinary Sciences
Simon J. Haward, Cameron C. Hopkins, Amy Q. Shen
Summary: Research shows that introducing disorder into an ordered array of posts can promote chaotic fluctuations in viscoelastic flows through porous media, but the stability of pore geometry also depends on the nature of stagnation points exposed to the flow field.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Acoustics
M. Colvez, R. Cottereau
Summary: This paper focuses on the modeling of elastic wave propagation at small incidence angles through a randomly-fluctuating horizontally-layered slab. The model takes into account the coupling of quasi-P and quasi-S waves by establishing a coordinate system following the coherent front. The transmission and reflection coefficients of the slab are estimated by solving a set of coupled stochastic ordinary differential equations.
Article
Mechanics
Ai-Jun Li, Hui Fang, Yong Liu
Summary: This paper studies the interaction between water waves and a very large floating laminated disk in water of finite depth. An analytical solution and an approximated model are developed to calculate the deflection and bending moment of the disk, as well as the effects of different parameters on wave force and wave field.
Article
Mechanics
Takahito Iida, Ahmad Zareei, Mohammad-Reza Alam
Summary: The trajectory of surface gravity waves is influenced by gravitational acceleration, water density, and sea bed depth. In order to create an omnidirectional cylindrical cloaking device for finite-depth/deep-water waves, an elastic composite plate floating on the surface is proposed. The physical parameters of the plate are optimized to reduce scattered wave energy and wave drift force exerted on the object.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Acoustics
Fatima Zahraa Kachkouch, Herve Franklin
Summary: This article investigates the Rayleigh mode (also known as generalized Rayleigh wave) at the flat interface between a liquid and a double porosity medium saturated by the same liquid. The double porosity medium follows the phenomenological model of Berryman and Wang (2000) and allows the concurrent propagation of three longitudinal waves and one transverse wave. Assuming open pore conditions at the interface, formulas are derived for the reflection coefficients in the liquid and transmission coefficients in the double porosity medium. By considering only the angular variable in the study, numerical simulations based on Berea sandstone data demonstrate the influence of frequency and the two types of porosity on the reflection coefficient and velocity of the generalized Rayleigh wave.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Mechanics
Chongwei Zhang, Pengfei Wang, Luofeng Huang, Mengke Zhang, Haitao Wu, Dezhi Ning
Summary: This paper investigates the hydroelastic response of a multi-patch floating photovoltaic (FPV) structure in water waves over a stepped seabed. The resonance conditions and underlying mathematical mechanism of FPV patches are explored. The effects of a stepped seabed and adjacent patches on the resonance conditions and hydroelastic behavior of FPV structures are also investigated.
Article
Multidisciplinary Sciences
Xin Wu, Qiao Yan, Ahmadreza Hedayat, Xuemei Wang
Summary: The study investigates the influence of concrete aggregate particle size on the propagation and attenuation of elastic waves. Results show that larger aggregate particles lead to more severe attenuation in wave amplitude, energy spectral density, and frequency, while the elastic wave spectrum center generally decreases with propagation distance.
SCIENTIFIC REPORTS
(2021)
Article
Acoustics
Thomas S. Jerome, Mark F. Hamilton
Summary: The Born approximation model for acoustic radiation force and torque has been extended to include inhomogeneous objects, with general restrictions such as non-similarity to a plane wave, small material property differences from the surrounding fluid, and comparable size to wavelength. The model was applied to objects with connected regions of different material properties and objects with continuously varying material properties, calculating spheres, finite cylinders, and prolate spheroids.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Acoustics
Jerome Laurent, Daniel Royer, Claire Prada
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2020)
Article
Physics, Multidisciplinary
William Lambert, Laura A. Cobus, Mathieu Couade, Mathias Fink, Alexandre Aubry
Article
Multidisciplinary Sciences
William Lambert, Laura A. Cobus, Thomas Frappart, Mathias Fink, Alexandre Aubry
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Geochemistry & Geophysics
Rita Touma, Thibaud Blondel, Arnaud Derode, Michel Campillo, Alexandre Aubry
Summary: This paper introduces a matrix approach for seismic imaging to retrieve a 3-D image of the subsoil with limited knowledge of background wave velocity. By analyzing reflection matrix and conducting matrix operations, it is possible to estimate and quantify background wave velocity fluctuations, and overcome the detrimental effect of wave velocity fluctuations on imaging by introducing a distortion matrix.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Optics
Victor Barolle, Jules Scholler, Pedro Mece, Jean-Marie Chassot, Kassandra Groux, Mathias Fink, A. Claude Boccara, Alexandre Aubry
Summary: Theoretical model for image formation in full-field optical coherence tomography (FFOCT) is discussed, showing nearly double resolution compared to standard imaging at moderate aberration levels. The study on FFOCT sensitivity to aberrations opens ways to optimized adaptive optics and computational tools for high-resolution deep imaging of biological tissues.
Article
Geochemistry & Geophysics
Rita Touma, Alexandre Aubry, Yehuda Ben-Zion, Michel Campillo
Summary: This study explores a new approach to analyze the distribution of scatterers in fault zones using a reflection matrix method, providing insights into the importance of small-scale heterogeneities for the structural and mechanical models of fault zones. The method allows for the resolution of local intensities and locations of features within fault zones, offering insights into deep rock damage.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Multidisciplinary Sciences
Francois Legrand, Benoit Gerardin, Francois Bruno, Jerome Laurent, Fabrice Lemoult, Claire Prada, Alexandre Aubry
Summary: This study reports on the experimental and numerical implementations of devices using negative refraction of elastic guided waves, specifically Lamb waves. The diffraction cancellation caused by negative refraction is investigated, revealing that these intriguing wave phenomena are limited to the propagating component of the wave-field. To surpass the diffraction limit, negative refraction is combined with the concept of metalens.
SCIENTIFIC REPORTS
(2021)
Article
Acoustics
M. Marmonier, S. Robert, J. Laurent, C. Prada
Summary: Real-time 3D ultrasound imaging is challenging in Non-Destructive Testing (NDT) due to time-consuming reconstruction algorithms. This paper presents an implementation using Fourier-domain algorithms to increase frame rates and reduce memory requirements. The proposed methods are evaluated by imaging a block of stainless steel containing a 3D network of spherical porosities.
Article
Computer Science, Interdisciplinary Applications
William Lambert, Justine Robin, Laura A. Cobus, Mathias Fink, Alexandre Aubry
Summary: This article presents a matrix approach for quantifying and correcting aberrations in ultrasound imaging. By analyzing the focused reflection matrix, which contains more information than traditional ultrasound images, the scattering contributions and aberrations can be measured. Compared to traditional methods, this approach provides better contrast and transverse resolution.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Computer Science, Interdisciplinary Applications
William Lambert, Laura A. Cobus, Justine Robin, Mathias Fink, Alexandre Aubry
Summary: This article presents a matrix approach for ultrasound imaging in heterogeneous media, focusing on the quantification and correction of aberration. By decoupling the aberrations and applying an iterative strategy, compensation for high-order and spatially-distributed aberrations can be achieved. Numerical validation demonstrates that the proposed method significantly improves the contrast and transverse resolution of ultrasound images.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Multidisciplinary Sciences
Flavien Bureau, Justine Robin, Arthur Le Ber, William Lambert, Mathias Fink, Alexandre Aubry
Summary: Matrix imaging is revolutionizing wave physics by optimizing compensation for aberrations and multiple scattering in heterogeneous media. This paper extends ultrasound matrix imaging to a 3D geometry and proposes a non-invasive approach to make the skull transparent for improved brain imaging.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
Cecile Brutt, Alexandre Aubry, Benoit Gerardin, Arnaud Derode, Claire Prada
Summary: In a heterogeneous medium, the Born expansion allows for the decomposition of the wave field and discrimination between single and multiple scattering contributions. Conventional imaging methods typically assume that multiple scattering can be disregarded, but this assumption fails for larger depths. Estimating the relative contributions of single and multiple scattering in experimental data is therefore crucial. This paper investigates the meaning of a single-scattering estimator in the backscattered wave field and highlights the impact of recurrent scattering, showing that it creates correlations between single and higher scattering orders which bias the estimator.
Article
Materials Science, Multidisciplinary
Laura A. Cobus, Georg Maret, Alexandre Aubry
Summary: In this study, we report on the anomalous light transport in the strong scattering regime. By using low-coherence interferometry, we have measured the reflection matrix of titanium dioxide powders, revealing crucial features of strong optical scattering that cannot be observed through transmission measurements. The findings support previous predictions that the near-field coupling between scatterers prevents Anderson localization of light in three-dimensional disordered media.
Proceedings Paper
Engineering, Electrical & Electronic
Paul Balondrade, Victor Barolle, Amaury Badon, Ulysse Najar, Kristina Irsch, Mathis Fink, Claude Boccara, Alexandre Aubry
Summary: This study introduces a non-invasive approach based on the distortion matrix concept to correct high-order aberrations in optical imaging, achieving a Strehl ratio enhancement up to 2500 and diffraction-limited resolution through an opaque cornea.
2021 ANNUAL CONFERENCE OF THE IEEE PHOTONICS SOCIETY (IPC)
(2021)
