Accession Number:

AD0733199

Title:

Interference of Wide-Band Sound in Shallow Water,

Descriptive Note:

Corporate Author:

ADMIRALTY RESEARCH LAB TEDDINGTON (ENGLAND)

Personal Author(s):

Report Date:

1971-02-01

Pagination or Media Count:

18.0

Abstract:

Propagation experiments are described covering ranges of several km and frequencies between 0.1 and 1.2 kHz. The interference pattern for a source towed past a hydrophone demonstrates a focussing effect predicted theoretically. The interference pattern for a fixed source shows tidal changes of a magnitude agreeing with theory. From the results of both experiments the number of modes effective is found to vary as frequency x range to the minus 12 power, which has important implications. The mean frequency spacing of the interference peaks and the time dispersion of pulses are reciprocally related, and for isovelocity water both are almost independent of range and frequency. Author

Subject Categories:

  • Acoustic Detection and Detectors
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE