Method and apparatus for seismic exploration using non-linear sw

Details Method and apparatus for seismic exploration using non-linear sw Method and apparatus for seismic exploration using non-linear sw

1986-09-29

1987-07-14

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Vibrator-type transmitter

367 49, H04K 120

Patent

active

046807411

ABSTRACT:
A method and apparatus for generating a nonlinear sweep signal to be supplied to a seismic vibrator. A seismic sweep time is determined and is divided into a plurality of preselected time intervals. The rate of change of the frequency is determined for each of these time intervals to generate an output signal of a desired shape. The rate of change of the frequency for each time interval is calculated in response to the starting frequency of the sweep, the range of the sweep, the sweep time, and the desired shape of the output signal. The rate of change is supplied to a frequency generator which generates a signal to be supplied to the vibrator.

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Werner et al., "Combisweep--A Contribution to Sweep Techniques," European Association of Exploration Geophysicists, Jun., 1977.
Lerwill, "Seismic Sources on Land," pp. 115-141, Glide Science Publications, 1979.
Broding, "The Continuous Sweep Vibroseis Method", Offshore Technology Conference, 1970.
Advertising Brochure--Texas Instruments "Vibrator Contol System", .COPYRGT.1980.
Advertisment--"Optimize Vibrator Operations with New III Vibrator Control system", printed in Geophysics, Jun. 1981 issue.

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