An Empirical Equation for the Determination of the Maximum Side-Aspect Target Strength of an Individual Fish

Abstract

Experiments are described in which the target strengths of a number of individual fish were measured at various frequencies. The results of these experiments are combined with results from six other sources and an empirical equation approximating the maximum side-aspect target strength of an individual fish is found to be: T = 24.1 log L - 4.1 log lambda - 33.2, for 1 < or = L/ lambda < or = 100, where T is the target strength at one yard in dB, L is the fish length in feet, and lambda is the acoustic wavelength in feet. This result is combined with a theoretical estimate of the resonance of a fish containing a swimbladder, to produce a curve approximating the maximum side-aspect target strength of an individual bladder-fish for L/lambda < or = 100.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1969
Accession Number
AD0849034

Entities

People

  • Richard H. Love

Organizations

  • Naval Oceanographic Office

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Equations
  • Fish
  • Frequency
  • Medical Personnel
  • Resonance
  • Resonant Frequency
  • Sonar
  • Target Strength
  • Targets

Readers

  • Acoustical Oceanography.
  • Analytical Mechanics
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering