DOPPLER CURRENTOMETER FOR LARGE FUNDS

摘要

THE INVENTION RELATES TO A DEVICE FOR MEASURING AQUATIC CURRENTS PLACED ON A MOVING BOAT COMPRISING A DOPPLER SONAR. /P P THE DEVICE HAS TWO GROUPS OF TRANSDUCER 2 AND 3 TRANSMITTING AND RECEIVING ACCORDING TO DIRECTIONS D, D , D AND D ANGLED A WITH VERTICAL Z. A TRANSMISSION CIRCUIT PROVIDES PULSES SIMULTANEOUSLY AT TWO FREQUENCIES F AND F. THE RECEPTION CIRCUIT 4 PROCESSES THE REVERBERATION ECHO SIGNALS IN VOLUME AFFECTED BY THE EFFECT DOPPLING, CORRESPONDING TO FREQUENCIES F AND F AS WELL AS ECHO FROM THE BOTTOM AFFECTS DOPPLING TO FREQUENCY FF-F, THIS FREQUENCY BEING GENERATED AS A RESULT OF THE NON-LINEARITIES OF THE MEDIUM. CIRCUIT 7 PROVIDES THE PROFILE OF HORIZONTAL SPEEDS OF CURRENT BY TRENCHES. /P P APPLICATION TO LARGE DEPTH CURRENTOMERS USED IN OIL PROSPECTION AND IN NAVIGATION.