Time-reversed sound beams of finite amplitude

Numerical simulations based on the nonlinear parabolic wave equation are used to investigate time reversal of sound beams radiated by unfocused and focused sources. Emphasis is placed on nonlinear propagation distortion in the time-reversed beam, and specifically its effect on field reconstruction....

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2001-06, Vol.109 (6), p.2668-2674
Main Authors: Cunningham, K B, Hamilton, M F, Brysev, A P, Krutyansky, L M
Format: Article
Language:English
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Summary:Numerical simulations based on the nonlinear parabolic wave equation are used to investigate time reversal of sound beams radiated by unfocused and focused sources. Emphasis is placed on nonlinear propagation distortion in the time-reversed beam, and specifically its effect on field reconstruction. Distortion of this kind, due to amplification during time reversal, has been observed in recent experiments [A. P. Brysev et al., Acoust. Phys. 44, 641-650 (1998)]. Effects of diffraction introduced by time-reversal mirrors with finite apertures are also considered. It is shown that even in the presence of shock formation, the ability of time reversal to retarget most of the energy on the source or focal region of the incident beam is quite robust.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.1368405