Communications – electrical: acoustic wave systems and devices – Signal transducers – Vibrator-type transmitter
Patent
1983-09-23
1986-01-28
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
Vibrator-type transmitter
181401, 181107, G01V 114
Patent
active
045675830
ABSTRACT:
A seismic vibrator for shaking the ground is driven by an input sweep signal. A control signal, which is a function of the output force level of the vibrator, modulates the sweep signal to limit the output force level to a value that will prevent ground decoupling. At the beginning of a sweep, an adaptive preset signal over-rides the control signal during a desired initial time portion of the sweep signal. The preset signal for a given sweep is derived from a sample of the control signal that existed during a specified portion of an immediately previous sweep.
REFERENCES:
patent: 3208550 (1965-09-01), Castanet et al.
patent: 3895343 (1975-07-01), Farr
patent: 4049077 (1977-09-01), Mifsud
patent: 4051473 (1977-09-01), Hooker
patent: 4068210 (1978-01-01), Corkhill
patent: 4173749 (1979-11-01), Corkhill
patent: 4184144 (1980-01-01), Rickenbacker
Werner et al., "Combisweep- . . . Sweep Techniques", 6/77, pp. 78-105, 39th Meeting of Europ. Assoc. of Explor. Geo., (Geophysical Prospecting), vol. 27.
Landrum, "Quality Control . . . Vibrators", 1976, pp. 1-22, 1976 Ann. Mtg. of SEG.
Knox William A.
Moskowitz Nelson
Western Geophysical Company of America
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