scholarly journals Analysis of time-reversal-based propagation for spatial focusing and multiplexing

2011 ◽  
Author(s):  
F. Monsef ◽  
A. Cozza
Keyword(s):  
Time Reversal ◽  
Spatial Focusing

Spatial focusing of a one-channel time-reversal acoustic mirror in an underground water storage tank at audible frequencies

2017 ◽  
Vol 141 (5) ◽  
pp. 3915-3915
Author(s):  
Gaston Maffei ◽  
Gabriel Scoccola ◽  
Diego A. Wisniacki ◽  
Ignacio Spiousas ◽  
Alejo Alberti ◽  
...  
Keyword(s):  
Time Reversal ◽  
Storage Tank ◽  
Water Storage ◽  
Underground Water ◽  
Water Storage Tank ◽  
Spatial Focusing

scholarly journals LOSS OF RESOLUTION FOR THE TIME REVERSAL OF WAVES IN RANDOM UNDERWATER ACOUSTIC CHANNELS

2013 ◽  
Vol 23 (11) ◽  
pp. 2065-2110 ◽  
Author(s):  
CHRISTOPHE GOMEZ
Keyword(s):  
Time Reversal ◽  
Underwater Acoustic Channel ◽  
Underwater Acoustic ◽  
Acoustic Channel ◽  
Coupled Mode ◽  
Transverse Profile ◽  
Underwater Acoustic Channels ◽  
Separation Of Scales ◽  
Propagation Medium ◽  
Spatial Focusing

In this paper we analyze a time reversal experiment in a random underwater acoustic channel. In this kind of waveguide with a semi-infinite cross-section a propagating field can be decomposed over three kinds of modes: the propagating modes, the radiating modes and the evanescent modes. Using an asymptotic analysis based on a separation of scales technique we derive the asymptotic form of the the coupled mode power equation for the propagating modes. This approximation is used to compute the transverse profile of the refocused field and show that random inhomogeneities inside the waveguide deteriorate the spatial focusing. This result, in an underwater acoustic channel context, is a counterexample of the classical results about time reversal experiment in other configurations for which randomness in the propagation medium enhances the refocusing.

The spatial focusing of a leaky time reversal chaotic cavity

2007 ◽  
Vol 17 (1) ◽  
pp. 67-83 ◽  
Author(s):  
G. Montaldo ◽  
N. Perez ◽  
C. Negreira ◽  
M. Fink
Keyword(s):  
Time Reversal ◽  
Spatial Focusing
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