Low- and high-frequency ocean acoustic phase conjugation experiments

Details Low- and high-frequency ocean acoustic phase conjugation experiments Low- and high-frequency ocean acoustic phase conjugation experiments

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4123..104s&link_type=abstract

Proc. SPIE Vol. 4123, p. 104-108, Image Reconstruction from Incomplete Data, Michael A. Fiddy; Rick P. Millane; Eds.

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We have performed a series of acoustic phase conjugation (PC0 experiments in shallow water. A time reversal mirror (TRM) was implemented for center frequencies of 450 Hz and 3500 Hz. Very sharp focal regions out to ranges of 30 km were obtained. Analysis, including attenuation effects, indicates that the diffraction limit on the size of the focal region was reached. This has implications for defining the maximum resolution of a matched field processor because the latter is simply a hybrid computational implementation of PC. The fact that a TRM both spatially and temporally refocuses energy with the aid of a probe suggests that ocean self-equalization with respect to communication processing is possible. Indeed, a preliminary demonstration of this self-equalization process was experimentally achieved.

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