THE MEASUREMENT OF IN-SITU VELOCITY AND ATTENUATION IN MARINE SEDIMENTS

Authors
  1. Mayer, L.A.
  2. Bugden, P.
  3. Simpkin, 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-accurate, 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 realtime and digitized waveforms stored for subsequent attenuation analyses. Attenuation is determined by spectral ratio in three bands (approx. 200, 500, and 750 kHz). This system has now been modified to work on the Hysub 5000, and new 5000 m ROV that uses a fiber optic link for data transmission. TRUNCATED
Report Number
DREA-CR-89-412 — Contractor Report
Date of publication
15 Apr 1989
Number of Pages
44
DSTKIM No
89-02813
CANDIS No
95706
Format(s):
Hardcopy;Originator's fiche received by DSIS

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