Acoustics – Geophysical or subsurface exploration – Seismic source and detector
Patent
1999-10-21
2000-11-28
Dang, Khanh
Acoustics
Geophysical or subsurface exploration
Seismic source and detector
367 38, G01V 100
Patent
active
061522562
ABSTRACT:
A method used for controlling vibrator ground force output from a seismic vibrator and reducing potential damage to nearby structures. The method may be applied to any type of seismic vibrator for controlling the amount of vibrator force output applied to a ground subsurface. The subject method controls the vibrator force output as a function of frequency to form a force variable sweep. Low frequency waves are harmful to structures. The force variable sweep reduces the percentage of harmful low frequency waves while imparting a great deal of energy. The method steps include first selecting and constructing a frequency dependent force function from either a hyperbolic tangent function mathematical equation or a simple step function mathematical equation. Second, implementing a seismic vibrator frequency control instrument with the selected frequency dependent force function. Third, applying the force function to either a seismic upsweep or a seismic downsweep. Fourth, generating 20 percent of a total force output in a frequency range of 2 to 50 Hz. The last step, increasing the output to 80 percent of the total force output in a frequency range of 50 to 100 Hz.
REFERENCES:
patent: 5410517 (1995-04-01), Andersen
patent: 5822269 (1998-10-01), Allen
Favret Paul
Genaud Evan B.
Aspect Resources LLC
Crabtree Edwin H.
Dang Khanh
Margolis Donald W.
Pizarro Ramon L.
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