Observed limiting cases of horizontal field coherence and array performance in a time-varying internal wavefield

Jon M. Collis, Timothy F. Duda, James F. Lynch, Harry A. DeFerrari

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Using a moored source and horizontal/vertical line array combination, horizontal coherence properties of high signal to noise ratio (≥20 dB) 100-1600 Hz signals have been measured. Internal waves in the area of the measurement created moving episodic sound-speed anomaly structures, influencing coherence length. Measured horizontal coherence scales for 100 Hz ranged from 5 to 20 acoustic wavelengths, and were inversely related to the sound-speed anomaly strength. Horizontal field properties were compared with fields computed using modal decompositions of the vertical signals. The comparison allows azimuthal field coherence properties to be studied apart from normal-mode interference effects.

Original languageEnglish (US)
Pages (from-to)EL97-EL103
JournalJournal of the Acoustical Society of America
Volume124
Issue number3
DOIs
StatePublished - 2008

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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