Telescoping actuator for impulsive seismic source

Details Telescoping actuator for impulsive seismic source Telescoping actuator for impulsive seismic source

1988-03-14

1989-04-11

Steinberger, Brian S.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181114, 92 52, G01V 1147

Patent

active

048197599

ABSTRACT:
An impact type surface seismic source powered by compressed air includes an elongated piston which moves within the bore of a cylindrical firing tube suitably mounted above an earth contacting target. The firing tube consists of two or more tubular sections slidably joined in telescopic relation. When the piston is allowed to fall from a cocked position, compressed air enters the bore above the piston through side ports and drives the piston downwardly. At the same time, the inner sliding section or sections of the firing tube are exposed to the same air pressure within the bore and are also driven downwardly. In this way, the bore of the firing tube lengthens automatically to provide a longer stroke for the piston and thus a greater attained kinetic energy of impact for a given operating pressure as the piston reaches the target. The apparatus is designed for mounting on a transport vehicle so that the firing tube itself may be raised in operation and lowered for reduced vehicle profile during transport.

REFERENCES:
patent: 4284164 (1981-08-01), Airhart
patent: 4284165 (1981-08-01), Airhart et al.
patent: 4402381 (1983-09-01), Airhart
patent: 4484657 (1984-11-01), Barta
patent: 4660674 (1987-04-01), Airhart
patent: 4702344 (1987-10-01), Airhart
patent: 4735280 (1988-04-01), Cole

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