Water turbulence detector

Details Water turbulence detector Water turbulence detector

1971-09-17

1996-08-27

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

367 87, 181 05, 310337, G01S 1500

Patent

active

055507891

ABSTRACT:
A Doppler shift flow meter array detects turbulence in the wake of a submne. Three sets of transmitting and receiving sonic transducers are spaced in a line on a rigid support. The transmitting transducers emit ultrasonic energy which is reflected from particulate matter in a surrounding water medium. The reflected energy is detected by the receiving transducers. A digital Doppler meter associated with each set of transmitting and receiving transducers develops a digital count over a fixed interval that is equal to the Doppler shift between transmitted and received energy. First differences between adjacent pairs of digital Doppler meters are obtained by two digital subtractors, and the second difference between Doppler shifts is obtained by a third digital subtractor. The second difference is non-zero only when ocean turbulence is present, such as produced by a submarine.

REFERENCES:
patent: 3671927 (1972-06-01), Proudian et al.

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