Source Level Calibration of the DREA Moving Coil Projector.

Abstract

SOUND GENERATORS,The Defence Research Establishment Atlantic moving coil projector (MCP) generates acoustic power at low frequencies (below 250 Hz) by displacing water with two pistons which oscillate in phase. The source level of the MCP must be continually monitored because it varies in accordance with the operating state of the projector. Source level as a function of time may be determined by combining measurements of the acceleration of the forward and aft pistons in an appropriate manner. This document establishes the methodology to use in this process by comparing at sea measured transmission loss of CW signals to theoretical calculations. This comparison reveals that corrections are required to the source level derived from the MCP accelerometers at the higher end of its frequency range.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1995
Accession Number
ADA296304

Entities

People

  • David M. Chapman
  • John C. Osler

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accelerometers
  • Acoustic Frequencies
  • Acoustic Measurement
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Ambient Noise
  • Calibration
  • Classification
  • Frequency
  • Losses
  • Measurement
  • Reflection
  • Security
  • Slant Range
  • Spreadsheet Software
  • Transmission Loss

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Acoustics.
  • Internal Combustion Engine (ICE) Technology.