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Title: Selective Mode Focusing in a Plate of Arbitrary Shape Applying Time Reversal Mirrors

In this study, a time reversal mirror is used to remotely focus symmetric or antisymmetric modes in a plate of arbitrary shape without the need of precise knowledge about material properties and geometry. The addition or subtraction of the forward motions recorded by two laser beams located on both sides of the plate allows, respectively, to focus a symmetric or an antisymmetric mode. The concept is validated using experimental and numerical analysis on an aluminum plate of complex machined geometry which exhibits various thicknesses as well as a bi-materials zone. Finally, the limitations and possible ways to overcome them are then presented.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [1] ;  [1]
  1. Aix-Marseille Univ., Marseille (France)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-30058
Journal ID: ISSN 1610-1928
Grant/Contract Number:
AC52-06NA25396; ANR 12-BS-09-0022-01
Type:
Accepted Manuscript
Journal Name:
Acta Acustica united with Acustica
Additional Journal Information:
Journal Volume: 103; Journal Issue: 6; Journal ID: ISSN 1610-1928
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Aix-Marseille Univ., Marseille (France)
Sponsoring Org:
USDOE; French National Research Agency (ANR)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; time reversal acoustics; lamb modes; elastic waves
OSTI Identifier:
1430016