Time reversal for elastic scatterer location from acoustic recording

F. Assous, M. Lin

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The aim of this paper is to study the feasibility of time-reversal methods in a non homogeneous elastic medium, from data recorded in an acoustic medium. We aim to determine, from partial aperture boundary measurements, the presence and some physical properties of elastic unknown “inclusions”, i.e. not observable solid objects, located in the elastic medium. We first derive a variational formulation of the acousto-elastic problem, from which one constructs a time-dependent finite element method to solve the forward, and then, the time reversed problem. Several criteria, derived from the reverse time migration framework, are then proposed to construct images of the inclusions, and to determine their locations. The dependence of the approach to several parameters (aperture, number of sources, etc.) is also investigated. In particular, it is shown that one can differentiate between a benign and malignant close inclusions. This technique is fairly insensitive to noise in the data.

Original languageEnglish
Article number109786
JournalJournal of Computational Physics
Volume423
DOIs
StatePublished - 15 Dec 2020

Keywords

  • Acousto-elastodynamics
  • Inverse problem
  • Numerical simulation
  • Time reversal
  • Wave propagation

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