HYDRA ARRAY HYDROPHONES

Authors
  1. Armstrong, B.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The Defence Research Establishment Atlantic has developed a line hydrophone array, HYDRA, for underwater acoustics research in shallow water. The hydrophones are quiet when bottom-mounted, but are often contaminated with noise in the frequency band below 10 Hz when deployed in the water column. An analysis of noisy sea-trial data indicated that the noise could be reduced if the hydrophones were better decoupled from the wave-induced fluctuating forces in the array cable. The report describes the development of a new force-decoupled hydrophone, which reduced the array self-noise more than 20 dB in sea tests. The finite element program MAVART was used extensively in the analysis of the new hydrophone.
Report Number
DREA-TM-84-T — Technical Memorandum
Date of publication
15 Sep 1984
Number of Pages
17
DSTKIM No
84-04377
CANDIS No
123321
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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