Flow noise reduction

Details Flow noise reduction Flow noise reduction

1989-05-31

1990-01-16

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367901, 367131, 367135, 367 24, G01V 136, G01V 138

Patent

active

048948080

ABSTRACT:
The level of signal noise caused by fluid flow at a pressure transducer, such as a hydrophone or geophone, is determined by measuring the electric field induced when the fluid flow through a magnetic field. The electric field, which is proportional to flow rate, is measured by electrodes positioned about the transducer. The pressure due to the flow is derived from the flow rate voltage by a digital filter which may be adaptive, to allow for varying flow conditions, or which may employ a predetermined electric field/flow noise relation. This flow noise is then subtracted from the received signal, the resultant signal then being substantially noise free.

REFERENCES:
patent: 3290645 (1966-12-01), Pavey, Jr. et al.
patent: 4296487 (1981-10-01), Green
patent: 4388711 (1983-06-01), Fay
patent: 4437175 (1984-03-01), Berni
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4520467 (1985-05-01), Berni

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