Time-reversed acoustics in random media and in chaotic cavities

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Abstract
The objective of this paper is to show that time reversal invariance can be exploited in acoustics to accurately control wave propagation through propagating media whose ray dynamics is chaotic. To illustrate these concepts, several experiments conducted with `time reversal mirrors' are presented. They show that chaotic dynamics reduces the number of reversible transducers needed to ensure an accurate time reversal experiment. Multiple scattering in random media and reverberation in chaotic cavities enhance resolution in time reversal acoustics by making the effective size of time reversal mirrors much larger than their physical size. Comparisons with phase-conjugated experiments will show that this effect is typical of broadband time-reversed acoustics and is not observed in monochromatic phase conjugation. Self-averaging properties of time reversal experiments conducted in chaotic scattering environments will be emphasized.

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