Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1976-07-21
1977-11-01
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181116, 181119, G01V 104, G01V 114
Patent
active
040561640
ABSTRACT:
A seismic signal source apparatus is mounted on the bed of a vehicle by means of a support structure. The apparatus includes a base plate coupled to ground surface beneath the vehicle as well as a seismic signal transducer to inject sweep signals into the ground through the base plate. A restraining means is connected between the upper end of the transducer support structure and the vehicle bed to prevent rocking motion of the seismic signal source. The restraining means includes a double-acting hydraulic piston. The piston is provided with at least two spring-loaded, oppositely-directed check valves. The spring loaded valves open to allow the transducer base plate to adjust itself to the local ground contours when the transducer base plate is pressed to the ground by the weight of the vehicle. The valves remain closed during a sweep cycle to provide a rigid restraining link which prevents destructive rocking movements of the transducer and base plate during a sweep cycle.
REFERENCES:
patent: 3658148 (1972-04-01), Clynch
patent: 3690402 (1972-09-01), Stafford
patent: 3777843 (1973-12-01), Fair et al.
patent: 3884324 (1975-05-01), Hamilton et al.
patent: 3976161 (1976-08-01), Carman, Jr. et al.
Birmiel Howard A.
Knox William A.
Western Geophysical Co.
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