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