Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1979-07-23
1981-01-06
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
73304R, 340603, 222 47, 181120, G01V 138, G01V 114
Patent
active
042431166
ABSTRACT:
A new circuit is added to an electrical circuit including two electrodes underwater positioned very close to an air gun gaseous exhaust wherein the exhaust from the firing air gun momentarily blows away the conductive sea water from one or both of the electrodes to produce a high voltage pulse due to the large increase in resistance in the circuit indicating the precise moment of firing of the air gun free of any uncertainty and mechanical noise which normally affects conventional transducers.
This new circuit added to the above circuit is a circuit polarity reversing circuit which includes particularly a positive current generator, a negative current generator, and a sea ground for forming a third electron source when any of the two electrodes becomes defective, thus forming a fail-safe system. Further, the resultant circuit changes polarity of the electrodes after each firing of the air gun and periodically reverses the current to the electrodes for reduced plating action on the electrodes and for reduced cross coupling between other channels.
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Kolojiwczak, "Stagray System Improved Primary Pulse/Bubble Ratio in Marine Exploration", 5/8/74, pp. 801-808, Offshore Technology Conference, vol. I, OTC 2020.
Elliott, Jr. Lloyd E.
Hudson John L.
Kulason Robert A.
Moskowitz Nelson
Nichols Theron H.
Ries Carl G.
Texaco Inc.
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