Near-caustic behavior in a 270-km acoustical experiment

Jeffrey A. Simmen, Stanley M. Flatté, Harry A. DeFerrari, Hien Nguyen, Neil J. Williams

Research output: Contribution to journalReview articlepeer-review

6 Scopus citations


Data from a pulse-propagation experiment are analyzed to quantify fluctuations in the transmitted acoustic signal. In the experiment a bottom- moored, broadband source having a 460-Hz center frequency transmitted 273 km away to a bottom-moored, vertical hydrophone array spanning 180 m of the water column. Pulses were transmitted every 12 min for a total duration of nearly 100 h. Because the minimal hydrophone separation at the receiving array was less than 2 m, vertical behavior on small scales could be observed. Furthermore, the vertical position of the receiving array enabled an examination of the near-caustic portion of wavefronts, and in some cases, the caustics themselves. Unfortunately, because instrument motion measurements were unsuccessful, relative rather than absolute signal fluctuations were the principal observable in this analysis.

Original languageEnglish (US)
Pages (from-to)3231-3244
Number of pages14
JournalJournal of the Acoustical Society of America
Issue number6
StatePublished - Jun 21 1999

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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