Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1986-03-20
1987-10-27
Walsh, Donald P.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181117, 91403, G01V 1147
Patent
active
047023449
ABSTRACT:
An impact-type surface seismic source utilizing a closed air system includes a heavy pistons supported above an earth contacting base plate partially within a hollow upstanding cylindrical housing, having a closed top and an open bottom. The housing side walls are provided with ports which communicate with a source of high pressure air. Preparatory to a firing operation, the piston blocks these ports, but upon a firing signal the piston is released and falls under gravity permitting high pressure air to enter the bore of the housing through the ports, thus driving the piston downwardly to strike the base plate. As the piston is retrieved and nears its original position, blocking the side ports, it mechanically actuates a valve so as to vent any air trapped above the piston within the housing bore. The vent remains open until the piston again falls.
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patent: 4485889 (1984-12-01), Bays
Atlantic Richfield Company
Betz Robert M.
Steinberger Brian S.
Walsh Donald P.
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