Parallel operation of seismic vibrators without phase control

Details Parallel operation of seismic vibrators without phase control Parallel operation of seismic vibrators without phase control

1973-10-18

1976-10-05

Birmiel, H.A.

Communications: electrical

Selective

Interrogation response

340 155TA, 340 155TS, G01V 122, G01V 114

Patent

active

039848051

ABSTRACT:
A control system for a seismic vibrator, in which the reference, or sweep signal, drives the vibrators directly without the need to control the vibrator so that the seismic signal generated in the earth will be inphase with the reference signal. Instead, the output of one or more sensors on the vibrator are used to generate a "transmitted" signal which is representative of the seismic signal generated in the earth. The transmitted signal is used to phase-shift the reference signal to provide a counterpart signal which is inphase with the transmitted signal. The counterpart signal is used to correlate with the received seismic signal.
A plurality of vibrators may be used. They may be grouped together at one point, or they may be spaced apart at independent points. The vibrators may use the same or different reference signals, and may start simultaneously or at delayed times.
An improved sensor for mounting on the vibrator is described to provide information as to the absolute displacement of the base plate during vibrator operation.

REFERENCES:
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patent: 3288243 (1966-11-01), Silverman
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patent: 3386525 (1968-06-01), Landrum
patent: 3516510 (1970-06-01), Coburn
patent: 3523277 (1970-04-01), Landrum, Jr.
patent: 3578102 (1971-05-01), Ross
patent: 3885225 (1975-05-01), Anstey et al.

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