title: Depth profile of a time-reversal focus in an elastic solid.
abstract: The out-of-plane velocity component is focused on the flat surface of an isotropic solid sample using the principle of time reversal. This experiment is often reproduced in the context of nondestructive testing for imaging features near the surface of the sample. However, it is not clear how deep the focus extends into the bulk of the sample and what its profile is. In this paper, this question is answered using both numerical simulations and experimental data. The profiles of the foci are expressed in terms of the wavelengths of the dominant waves, based on the interpretation of the Lamb's problem and the use of the diffraction limit.
authors.affiliation: Geophysics Group (EES-17), MS D446, Los Alamos National Laboratory, Los Alamos, NM 87545, United States. Electronic address: mcr1@lanl.gov.
authors.forename: Marcel C
authors.initials: MC
authors.lastname: Remillieux
authors.affiliation: Geophysics Group (EES-17), MS D446, Los Alamos National Laboratory, Los Alamos, NM 87545, United States.
authors.forename: Brian E
authors.initials: BE
authors.lastname: Anderson
authors.affiliation: Geophysics Group (EES-17), MS D446, Los Alamos National Laboratory, Los Alamos, NM 87545, United States.
authors.forename: T J
authors.initials: TJ
authors.lastname: Ulrich
authors.affiliation: Geophysics Group (EES-17), MS D446, Los Alamos National Laboratory, Los Alamos, NM 87545, United States.
authors.forename: Pierre-Yves
authors.initials: PY
authors.lastname: Le Bas
authors.affiliation: Aix Marseille Université, Laboratory of Mechanics and Acoustics, LMA CNRS UPR 7051, 31 chemin Joseph-Aiguier, 13402 Marseille CEDEX 20, France.
authors.forename: Cedric
authors.initials: C
authors.lastname: Payan
keywords: Elastodynamics; Lamb’s problem; Time-reversal