IN-SITU AND LABORATORY MEASUREMENTS OF THE ACOUSTIC PROPERTIES OF ARCTIC MARINE SEDIMENTS

Authors
  1. Mayer, L.A.
  2. Bugden, P.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Dalhousie Univ, Halifax NS (CAN) Dept of Oceanography
Abstract
Researchers at Dalhousie University have recently developed a highly-accourate, computer-controlled system for measuring the speed and attenuation of sound in marine sediments. This system uses a dedicated microcomputer, programmable function generator, digital oscilloscope, and temperature monitoring equipment to generate and digitize (at 20 MHz) broad-band acoustic pulses in sediment samples. Time-of-flight measurements are made in real time and digitized waveforms stored for subsequent attenuation analyses. Attenuation is determined by spectral ratio in several bands (approx. 200, 500, and 750 kHz). This system has been modified to work on the Hysub 5000 ROV and now on the Canadian Navy's submersible diving lock (SDL-1).
Report Number
DREA-CR-90-414 — Contractor Report
Date of publication
15 Apr 1990
Number of Pages
72
DSTKIM No
90-03860
CANDIS No
66103
Format(s):
Hardcopy;Originator's fiche received by DSIS

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