Floating sensor to detect very low frequency pressure signals

Details Floating sensor to detect very low frequency pressure signals Floating sensor to detect very low frequency pressure signals

1990-12-27

1991-12-31

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Beam stabilization or compensation

367901, G01S 1500

Patent

active

050776967

ABSTRACT:
A floating sensor system is provided to detect very low frequency pressure ignals (down to 0.01 Hz). This system detects pressure fluctuations or pressure signals of interest in the ocean or other body of water in the presence of unwanted pressure signals generated by surface wave induced motion. A drifting sensor surface float follows the surface waves and in turn moves a suspended pressure sensor vertically, such that it detects the wave motion as a change in static pressure which then constitutes a noise source. A correlation circuit and a logic circuit discriminate between a first composite signal, comprised of the pressure signals of interest and wave motion noise, and a second reference signal, comprised only of the wave motion noise to provide an output signal transmitted to a monitoring station.

REFERENCES:
patent: 4091356 (1978-05-01), Hutchins
patent: 4222266 (1980-09-01), Theodulou
patent: 4232381 (1980-11-01), Rennick et al.
patent: 4310904 (1982-01-01), Ballard et al.
patent: 4345473 (1982-08-01), Berni
patent: 4388711 (1983-06-01), Fay

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