Accession Number:

ADA071329

Title:

Acoustic Wave Scattering from a Progressive Internal Wavefield,

Descriptive Note:

Corporate Author:

NAVAL UNDERSEA CENTER SAN DIEGO CA

Personal Author(s):

Report Date:

1970-01-22

Pagination or Media Count:

19.0

Abstract:

The scattering of sound from an internal wave field is considered. The acoustic index of refraction depends on the density of sea water. Hence, spatial and temporal density variations arising from the presence of internal waves will produce a perturbation in the index of refraction. Therefore, an acoustic wave transmitted through a stratitied fluid in which internal waves are present, will be modulated by the internal wave field and scattering and refraction will occur. It is shown that the frequency spectrum of the scattered acoustic field is comprised of the fundamental acoustic frequency and two side frequencies. Equations describing the phenomenon are given. Author

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE