450 CPS Electro-Hydroacoustic Transducer Tests in Seneca Lake

Abstract

Low level measurements on the 450 cps Electro-hydroacoustic Research Source indicate remarkably good agreement with the theoretical directivity pattern and radiation impedance as provided by the U.S. Navy Underwater Sound Lab. The transducer piston resonant frequency in water is 1% lower than design value. The in-air Q of the piston assembly is approximately 43, and the in- water Q approximately 3.2. On the basis of these Q measurements, the mechano- acoustic efficiency of the piston circuit should be in excess of 90%. From direct measurements of power radiated to the far field and power in-put to the piston circuit the actual mechano-acoustic efficiency appears to be closer to 55 to 60%. An anomalous loss is therefore in evidence when the transducer is submerged in water.

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Document Details

Document Type
Technical Report
Publication Date
Jun 15, 1962
Accession Number
ADA036320

Entities

Organizations

  • General Dynamics

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Circuits
  • Far Field
  • Frequency
  • Frequency Response
  • Hydrophones
  • Lc Circuits
  • Measurement
  • Power Measurement
  • Power Supplies
  • Pressure Measurement
  • Radiation
  • Radiation Resistance
  • Reflection
  • Resonant Frequency
  • Test Facilities
  • Transducers

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Electrical Engineering
  • Theoretical Analysis.