Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent
1979-10-01
1982-06-08
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
367166, 367171, 367177, 73644, G01V 118
Patent
active
043342965
ABSTRACT:
The seismic method comprises in one preferred embodiment, towing a long, flexible member over the earth's surface, the member having liquid-filled geophones mounted thereon or coupled thereto and suitably spaced therealong, and a seismic cable for receiving the individual outputs of the geophones. Each liquid-filled geophone provides an output electric signal having a polarity corresponding to the direction of the earth's motion. In another embodiment of the method of this invention, the geophones are positioned on the earth's surface in a predetermined pattern; their output signals are transmitted to a utilization device; then the geophones are moved to another location, and the detection process is repeated.
In a simplified embodiment, the geophone comprises a hollow cylindrical casing defining a chamber therein. A high-density liquid substantially fills the chamber. The chamber has a flexible bottom wall which constitutes a force or pressure transducer. In a preferred embodiment of the geophone, the chamber has in addition to the flexible bottom wall, a flexible top wall which also constitutes a transducer. The geophone provides at its output terminals an electric signal which suitably combines the output signals of the pair of transducers.
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patent: 2650991 (1953-09-01), Ketchledge
patent: 3187300 (1965-06-01), Brate
patent: 3461730 (1969-08-01), Peters
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patent: 3810083 (1974-05-01), Kostelnicek
patent: 3813744 (1974-06-01), Morris
patent: 3911388 (1975-10-01), Crump et al.
patent: 3987320 (1976-10-01), Merhar
patent: 4104921 (1978-08-01), Nisser
Brunell Norman E.
Knox William A.
Moskowitz Nelson
Western Geophysical Co. of America
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