Acoustic Attenuation Research at USL.

Abstract

This paper describes the research which has been done at this Laboratory concerning the attenuation of low-frequency sound in the ocean. By low frequency we mean from 10-10,000 Hz. Starting in the middle 1950's, interest in long-range acoustic systems stimulated low frequency attenuation measurements. The small losses involved at these frequencies require somewhat specialized experimental conditions which are shown in the first figure. In order to get totally refracted acoustic paths over the order of hundreds of miles the so-called sound channel is utilized. By detonating explosive charges at the sound velocity minimum, some of the energy is constrained by the two gradients to travel along the channel axis. The received signals when analyzed, are filtered to give data in a particular frequency band. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 19, 1968
Accession Number
ADA060195

Entities

People

  • David G. Browning

Organizations

  • Navy Underwater Sound Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustic Attenuation
  • Attenuation
  • Energy
  • Explosive Charges
  • Explosives
  • Frequency
  • Frequency Bands
  • Heat Of Activation
  • Lake Superior
  • Lakes
  • Losses
  • Measurement
  • Oceans
  • Red Sea
  • Undersea Warfare
  • Underwater Sound

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Combustion Dynamics and Shock Wave Physics.
  • Systems Analysis and Design