Basics of Nonlinear Time Reversal Acoustics

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Claes Hedberg
Title: Basics of Nonlinear Time Reversal Acoustics
Conference name: 3rd Conference on Mathematical Modeling of Wave Phenomena/20th Nordic Conference on Radio Science and Communications
Year: 2009
Volume: 1106
Pagination: 164-172
ISBN: 978-0-7354-0643-8
City: Vaxjo, SWEDEN
ISI number: 000264867300018
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för teknik – avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
Language: English
Abstract: An investigation of time reversal of nonlinear and non-dissipative or dissipative plane sound waves was made. Propagation and back propagation is time reversal invariant only when the dissipation is zero and the wave has not been shocked. A wave that has shocked has irretrievably lost part of its content. Still, if the wave and its derivatives are considered continuous there remain in theory forever information about the original signal. Factors like numerical accuracy and noise naturally set limits in practical situations.
Subject: Mechanical Engineering\General
Keywords: Acoustic time reversal, acoustic back propagation, nonlinear attenuation, shock front reversal