Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1979-01-22
1980-07-08
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
367144, G01V 138
Patent
active
042113008
ABSTRACT:
An improved air gun consists of an elongated cylindrical housing for containing a volume of compressed air that is closed at each end by end plates. A radially-positioned exhaust port is bored into the wall of the housing. A hollow, cylindrical shuttle, is mounted concentrically inside the housing for linear back-and-forth sliding motion in alternate strokes. The ends of the shuttle are closed by end faces. A radially positioned sealing pad has an orifice that is alignable with the exhaust port is supported by the shuttle. When the shuttle is at either end of a stroke, the sealing pad blocks the exhaust port. The space between each shuttle end face and the respective housing end plates form shuttle-actuation control chambers. A small air leak in each control chamber maintains the residual air pressure therein at ambient when the guns is inactive. To fire the gun, a small quantity of air is diverted by valving from inside the housing to one of the control chambers. The inrush of compressed air to the control chamber greatly exceeds the leakage rate of the air leak and accelerates the shuttle towards the opposite end of the housing. During passage from one end of the housing to the other, the orifice in the sealing pad momentarily opens the exhaust port to emit a jet of compressed air. Upon completion of the stroke, the diversion valving is disabled and the residual air pressure in the control chamber returns to ambient.
REFERENCES:
patent: 4049078 (1977-09-01), Paitson et al.
patent: 4180139 (1979-12-01), Walker
Birmiel Howard A.
Knox William A.
Western Geophysical Co. of America
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