Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1993-11-02
1995-09-12
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
181120, G01V 140, H04R 2300
Patent
active
054503744
ABSTRACT:
A seismic source apparatus 10 includes body 12, cap 22, actuator 24, and shuttle 26. Body 12 includes a main chamber 14 that is formed therein and adapted to receive a charge of compressed air. Actuator 24 is preferably a solenoid actuated valve, capable of rapidly opening and closing in response to an electrical signal. Seismic source apparatus 10 includes a solenoid chamber orifice 38 that is positioned within a fill passage 34 to enable fluid communication between fill passage 34 and solenoid chamber 40. Solenoid chamber orifice 38 and solenoid chamber 40 are configured to provide a quick burst of high pressure air through actuator 24 when actuator 24 is opened in order to start the shuttle 26 in motion, while restricting the flow of air from main fill passage 34 and main chamber 14 into the actuator 24 so that the pressure in the main chamber 14 remains high enough to emit a suitable bubble, and so that shuttle 26 is not prevented from closing. A spring chamber 44 containing either compressed air or a mechanical spring provides a closing force bearing on surface 46 of shuttle 26. A shut-off chamber 68 is circumferentially disposed between shuttle 26 and cap 22, and is adapted to receive a portion of air released from the main chamber 14 during firing to provide an additional closing force on shuttle 26 when seismic source apparatus 10 is fired. A water sealing mechanism 74 prevents the flow of ambient fluid into shut-off chamber 68 prior to firing.
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Technical paper written by Roy C. Johnston, "Development of More Efficient Air Gun Arrays: Theory and Experiment, " was delivered at the 1981 European Association of Exploration Geophysicists conference, Venice, Italy.
"Airgun Efficiency-Some Measurements," lecture presented by Mr. Lloyd Paitson of Exploration Equipment Research, Inc. to the E.A.E.G. conference, Hamburg, May 29, 1979.
Brochure "EERI Model 3 Air Gun," EERI Exploration Equipment Research, Inc., Galveston, Tex. 77552.
Eldred J. Woodrow
Western Atlas International Inc.
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