Multivibrator waveform monitoring system

A multivibrator waveform monitoring system using a plurality of seismic energy sources for giving vibrations to strata and a prospector, connected to a geophone, for measuring reflected vibrations,

• each of said plurality of seismic energy sources including:
• communication means for carrying out communications with said prospector;
• a vibrator time-swept multifrequency for generating vibrations by changing an oscillation frequency based on a signal from control means;
• a detector for detecting a vibration frequency of said vibrator;
• a reference signal generator for generating a sweep reference signal which becomes a reference for vibrations of said vibrator;
• and
• said control means, including said reference signal generator, for causing said vibrator to generate the vibration frequency in a phase which is approximate to said sweep reference signal by using a signal that is said sweep reference signal added by a signal fed back from said detector,
• said prospector including;
• communication means for carrying out communications with said seismic energy source;
• and
• synchronization control means for controlling the synchronization of said seismic energy sources, said synchronization control means receiving, by said communication means, information relating to the vibration frequency of said vibrator detected by said detector of each of said seismic energy sources, calculating a phase difference of variations between one of said plurality of seismic energy sources as a master unit and each of the rest of said seismic energy sources as a slave unit, and sending a calculated phase difference to each slave unit by said communication means, and
• means for feeding a phase difference of each slave seismic energy source back to said reference signal generator, for making the phase of vibrations of said vibrator of each of said slave seismic energy sources to be the same as the phase of vibrations of said master unit.