Communications – electrical: acoustic wave systems and devices – Signal transducers – Vibrator-type transmitter
Patent
1982-10-18
1987-03-31
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Vibrator-type transmitter
367 48, 324 83FE, 181114, G01V 116
Patent
active
046548360
ABSTRACT:
A vibrator seismic source has a hydraulic system, including a pad, for applying reciprocating forces to the ground and sensor means for generating a feedback signal representative of the force applied to the ground. Circuitry is provided for generating a pilot signal representative of the desired force to be applied to the ground. The pilot and feedback signals are single sideband shifted to increase both frequencies by a predetermined frequency. The high frequency pilot and feedback signals have their phase difference conventionally detected and provided to a digital computer for phase shifting the signal for controlling the vibrator so that the feedback signal is in phase with the pilot signal. In another embodiment, the instantaneous phase of each signal is computed continuously by a digital computer. The control signal digital representation is corrected to correspond with the pilot digital representation and an analog output signal is generated to provide the proper analog control signal.
REFERENCES:
patent: 3881167 (1975-04-01), Pelton et al.
patent: 3980828 (1976-09-01), Orban
patent: 3984805 (1976-10-01), Silverman
patent: 4068210 (1978-01-01), Corkhill
patent: 4500976 (1985-02-01), DuBroff
Devine Thomas G.
Heiting Leo N.
Lobo Ian J.
Sharp Melvin
Tarcza Thomas H.
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