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Title: Depth profile of a time-reversal focus in an elastic solid

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:
 [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Aix Marseille Univ., Marseille (France)
Publication Date:
OSTI Identifier:
1193443
Report Number(s):
LA-UR--14-29461
Journal ID: ISSN 0041-624X; PII: S0041624X14003497
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Ultrasonics
Additional Journal Information:
Journal Volume: 58; Journal Issue: C; Journal ID: ISSN 0041-624X
Publisher:
Elsevier
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 58 GEOSCIENCES; 36 MATERIALS SCIENCE time-reversal; elastodynamics; Lamb’s problem