Low- and high-frequency ocean acoustic phase conjugation experiments

Hee Chun Song; Geoffrey Edelmann; Seong-Il Kim; W. S. Hodgkiss; William A. Kuperman; Tuncay Akal

doi:10.1117/12.409260

16 November 2000 Low- and high-frequency ocean acoustic phase conjugation experiments

Hee Chun Song, Geoffrey Edelmann, Seong-Il Kim, W. S. Hodgkiss, William A. Kuperman, Tuncay Akal

Proceedings Volume 4123, Image Reconstruction from Incomplete Data; (2000) https://doi.org/10.1117/12.409260
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Hee Chun Song, Geoffrey Edelmann, Seong-Il Kim, W. S. Hodgkiss, William A. Kuperman, and Tuncay Akal "Low- and high-frequency ocean acoustic phase conjugation experiments", Proc. SPIE 4123, Image Reconstruction from Incomplete Data, (16 November 2000); https://doi.org/10.1117/12.409260

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