Acoustics – Geophysical or subsurface exploration – Programmed or timer-controlled
Patent
1983-08-26
1985-04-02
Wilbur, Maynard R.
Acoustics
Geophysical or subsurface exploration
Programmed or timer-controlled
181110, 181120, G01V 100, G01V 104, G01V 138
Patent
active
045081913
ABSTRACT:
The present invention relates to a method for initiating an underwater implosive seismic source which comprises the steps of: measuring the instantaneous pressure at the location of the source; determining, from this measured pressure, the bubble period separating the firing signal from the implosion peak of the shock wave; and initiating the source with a delay or advance of a value equal to the difference between the bubble period corresponding to the instantaneous pressure and that corresponding to the mean pressure. The invention also provides a device for carrying out this method which device comprises; means for measuring the instantaneous pressure in the neighborhood of the source; comparator means (C5) for comparing this pressure with a mean value; and time delay means (C3, C4) for delaying a firing signal (S1) by a value which is a function of the result of this comparison.
REFERENCES:
patent: 3544983 (1970-12-01), Wallace, Jr. et al.
patent: 3687218 (1972-09-01), Ritter
patent: 3712408 (1973-01-01), Muniz
patent: 3985199 (1976-10-01), Baird
patent: 4210897 (1980-07-01), Hutchins
Compagnie Generale de Geophysique
Issing Gregory C.
Wilbur Maynard R.
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