OVER THE LAST TWO YEARS STUDIES HAVE BEEM UNDERTAKEN TO DEVELOP AN ACOUSTIC LOW FREQUENCY TRANSMITTER CAPABLE OF TRANSMITTING DATA FROM SPECIALIZED SENSORS EMBEDDED UP TO 50 M IN OCEANIC SEDIMENTARY FORMATIONS IN WATER DEPTH OF 5 - 6 KM. DUE TO THE EXTREME CONDITIONS OF EMPLOYEMENT OF THIS INSTRUMENTATION, HIGH IMPACT VELOCITIES (200 KM/H), LARGE DECELERATIONS (>10 G) AND HIGH AMBIENT PRESSURES (ABOUT 600 BARS), PROBLEMS WERE ENCOUNTERED DURING INITIAL TESTS RESULTING IN THE LOSS OF A NUMBER OF UNITS. IN ORDER TO PHYSICALLY RECOVER THE INSTRUMENTATION FOR SUBSEQUENT INSPECTION, THE JOINT RESEARCH CENTRE DESIGNED AND CONSTRUCTED A DEEP WATER HIGH SPEED RETRIEVABLE INSTRUMENT SLEDGE. THE DEVELOPMENT OF THE SLEDGE AND THE RESULTS OF CARRIED OUT ON THE M.V. TYRO ARE REPORTED IN THE PRESENT PAPER
JAMET Michel;
1995-03-15
JRC5108
https://publications.jrc.ec.europa.eu/repository/handle/JRC5108,
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