Analog circuit for controlling acoustic transducer arrays

Details Analog circuit for controlling acoustic transducer arrays Analog circuit for controlling acoustic transducer arrays

1990-11-27

1991-10-08

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

340853, G01V 140

Patent

active

050560670

ABSTRACT:
A simplified ananlog circuit is presented for controlling electromechanical transducer pairs in an acoustic telemetry system. The analog circuit of this invention comprises a single electrical resistor which replaces all of the digital components in a known digital circuit. In accordance with this invention, a first transducer in a transducer pair of array is driven in series with the resistor. The voltage drop across this resistor is then amplified and used to drive the second transducer. The voltage drop across the resistor is proportional and in phase with the current to the transducer. This current is approximately 90 degrees out of phase with the driving voltage to the transducer. This phase shift replaces the digital delay required by the digital control circuit of the prior art.

REFERENCES:
patent: 3790930 (1974-02-01), Lamel et al.
patent: 3900827 (1975-08-01), Lamel et al.
patent: 3930220 (1975-12-01), Shawhan
patent: 4314365 (1982-02-01), Petersen et al.

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