Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1979-04-04
1980-08-26
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181115, 367144, G01V 138, G01V 114
Patent
active
042190975
ABSTRACT:
Disclosed is a seismic source device, known in the industry as an air gun, having shuttle and external sliding valve control for allowing a predetermined discharge of compressed air into water for purposes of seismic exploration. The shuttle is controlled by air pressure to move it upward, thereby permitting compressed air in the firing chamber to exhaust through exhaust ports. The external sliding valve had been held in a downward position by air pressure supplied from the firing chamber, compressing a spring. As the firing chamber pressure drops, the compressed spring expands, forcing the sliding valve to move upward, closing the exhaust ports. By preventing further discharge of air, secondary pulses are greatly reduced, with little or no loss in acoustic output, thereby enhancing the operation of the entire system. Further, by preventing all the air in the firing chamber from being discharged, the system becomes more efficient and more cost effective.
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Harrison Earnest R.
Johnston Roy C.
Devine Thomas G.
Heiting Leo N.
Moskowitz Nelson
Sharp Melvin S.
Texas Instruments Incorporated
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