Communications – electrical: acoustic wave systems and devices – Signal transducers – Vibrator-type transmitter
Patent
1984-10-01
1985-05-21
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
Vibrator-type transmitter
181119, 181401, G01V 114
Patent
active
045190534
ABSTRACT:
A seismic vibrator source having an hydraulic vibrator coupled to vibrate a ground pad is provided with one or more force transducers such as, for example, load cells, strain gauges, or piezoelectric elements for measuring the force applied to the earth. Signals indicative of the pressure force are applied to a controller for the hydraulic vibrator to adjust control signals to prevent decoupling of the ground pad from the earth during ground seismic operations.
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patent: 3363720 (1968-01-01), Mifsud
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Devine Thomas G.
Heiting Leo N.
Moskowitz Nelson
Sharp Melvin
Texas Instruments Incorporated
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