Vibrator seismic source having distortion limiting control syste

Details Vibrator seismic source having distortion limiting control syste Vibrator seismic source having distortion limiting control syste

1982-10-18

1986-10-07

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Vibrator-type transmitter

324 83FE, G01V 102

Patent

active

046163522

ABSTRACT:
A vibrator seismic source has a sweep generator for providing a pilot signal and sensors for generating a feedback signal representative of the force imparted to the ground by the vibrator pad. Circuitry is incorporated for separating the fundamental signal from the feedback signal and for separating the distortion from the feedback signal. Means are provided for generating a control signal for controlling the action of the vibrator, the control signal being reduced or increased by the difference between the pilot signal and the fundamental signal, and further reduced by the distortion, if any. A threshold circuit is employed to ignore distortion below the threshold level and a threshold circuit is provided to ignore differences in amplitude between the pilot and fundamental signals when the difference is below the threshold. Additionally, the control system employs a phase detector circuit that outputs any phase difference between the feedback and pilot signals. The phase difference is applied to the control signal to shift the feedback signal phase to correspond to the pilot signal.

REFERENCES:
patent: 3854118 (1974-12-01), Pelton
patent: 3979715 (1976-09-01), Hufstedler et al.
patent: 4056163 (1977-11-01), Wood et al.
"Vibratory Surface Sources," Seriff et al., Geophysics, vol. 35, #2, pp. 234-246, 1970.

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