SOURCE LEVEL CALIBRATION OF THE DREA MOVING COIL PROJECTOR

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Authors
  1. Osler, J.C.
  2. Chapman, D.M.F.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
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 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 positions in an approppriate 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.
Keywords
Moving Coil Projector;Bulk acoustic wave devices;Extremely low frequencies;Acoustic stability
Report Number
DREA-TM-95-215 — Technical Memorandum
Date of publication
01 May 1995
Number of Pages
35
DSTKIM No
95-03738
CANDIS No
152399
Format(s):
Document Image stored on Optical Disk;Hardcopy

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