Multivibrator waveform monitoring system

Communications – electrical: acoustic wave systems and devices – Signal transducers – Vibrator-type transmitter

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367 37, 181111, 181113, 181114, 181121, H04R 2300

Patent

active

054126231

ABSTRACT:
A multivibrator waveform monitoring system uses a plurality of seismic energy sources for giving vibrations to strata and a prospector, connected to a geophone, for measuring reflected vibrations. Each of the plurality of seismic energy sources includes a vibrator, a communication unit and a control unit for controlling the starting of the vibrator based on phase difference cancellation information and an operation starting instruction from the prospector. The prospector includes a communication unit and a synchronization control unit for controlling the synchronization of each of the seismic energy sources. The synchronization control unit receives detected information relating to the vibrations of the vibrator by the communication unit, compares a phase difference of vibrations between a master unit which is one of the seismic energy sources and each of slave units which are the rest of the seismic energy sources, calculates phase difference cancellation information for cancelling each phase difference, and transmits the phase difference cancellation information and an operation starting instruction for starting the vibrator by the communication unit. A timing for starting the vibrators of the vibrator for each seismic energy source is adjusted based on the phase difference cancellation information, to thereby make the phase of vibrations of the vibrator of each of the slave seismic energy sources to be the same as the phase of vibrations of the master unit.

REFERENCES:
patent: 4715020 (1987-12-01), Landrum, Jr.
patent: 4782446 (1988-11-01), Ehler et al.
patent: 4800538 (1989-01-01), Passmore et al.
patent: 5134590 (1992-07-01), Garotta

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