Abstract

Electromagnetic, early ocean acoustic experimental and theoretical work as well as laboratory ultrasonics [Zeldovich et al., Principles of Phase Conjugation (Springer-Verlag, Berlin, 1985); A. Parvelescu and C. S. Clay, Radio Electron. Eng. 29, 223–228 (1965); D. R. Jackson and D. R. Dowling, J. Acoust. Soc. Am. 89, 171–181 (1991); M. Fink, Sci. Am. Nov. 91–97 (1999)] suggest that time-reversal (or phase conjugation) methods provide opportunities for an assortment of applications in underwater acoustics. Recently, a series of ocean acoustic experiments have been carried out confirming the robustness and potential utility of time reversal mirrors in underwater acoustics [Kuperman et al., J. Acoust. Soc. Am. 103, 25–40 (1998); Akal et al., 5th ECUA, Lyon, France, 2000]. This total sequence of research is briefly reviewed as an introduction to the research presented in this session. [Work supported by ONR.]

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