Doppler current meter for use at great depths

Details Doppler current meter for use at great depths Doppler current meter for use at great depths

1979-11-06

1981-05-26

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

367 92, 73170A, 73189, G01S 1558

Patent

active

042701910

ABSTRACT:
The invention relates to a device for measuring aquatic currents, placed on a moving boat comprising a Doppler effect sonar. The device comprises two sets of transducers and transmitting and receiving in the directions D.sub.1, D.sub.2, D.sub.3 and D.sub.4 forming an angle .+-..alpha. with the vertical z. A transmission circuit supplies impulses simultaneously at two frequencies f.sub.1 and f.sub.2. The receiving circuit processes the signals of the volume reverberation echos affected by the Doppler effect, corresponding to the frequencies f.sub.1 and f.sub.2, and the sea bed echo affected by the Doppler effect at the frequency F=f.sub.1 -f.sub.2, this frequency being generated by the non-linearity of the medium. Finally are obtained the profile of the horizontal velocities of the currents function of the depth.

REFERENCES:
patent: 4138657 (1979-02-01), Shave

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