A Preliminary Investigation of Acoustic Energy Transmission from a Tapered Fluid Layer into a Fast Bottom.

Abstract

The transmission of acoustic energy from a tapered fluid layer into an underlying layer of fluid was investigated. Pulsed transmissions at frequencies of 75.85 kHz and 107.5 were used to insonify the upper layer while a small probe transducer was used to measure signal amplitude variation with depth in the lower layer. The experimental data collected indicate that a directional transmission of acoustical energy into the lower layer occurs over regions corresponding to the individual cutoff depths for normal modes in the upper layer. A simple method for estimating the position of these regions is discussed and the effects of frequency and upper layer slope variations are reported. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1976
Accession Number
ADA038616

Entities

People

  • James Nathaniel Edwards Jr

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Amplitude
  • Boundaries
  • California
  • Chemistry
  • Depression Angles
  • Dielectric Films
  • Errors
  • Experimental Data
  • Films
  • Frequency
  • Geometry
  • Materials
  • Measurement
  • Schools
  • Transducers
  • United States Naval Academy

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.