Ultrasonic wave transmitter/receiver

Details Ultrasonic wave transmitter/receiver Ultrasonic wave transmitter/receiver

1977-06-29

1979-02-13

Farley, Richard A.

Communications: electrical

Selective

340 3A, G01S 966, G01S 766

Patent

active

041398343

ABSTRACT:
An ultrasonic wave transmitter/receiver wherein an ultrasonic wave transducer is connected to a radiating ultrasonic wave carrier frequency oscillator through a switching means during transmission, while the ultrasonic wave transducer is connected to an operational amplifier and a band pass filter through the switching means during reception, comprises an impedance conversion circuit at an input of the operational amplifier to form a band pass amplifier of a low input impedance. By this arrangement, a receiving sensitivity near an antiresonance frequency of the transducer is reduced to lower the receiving sensitivity for noise, but without sacrificing an echo receiving sensitivity thereof, and a stable receiving operation is assured for possible change in a characteristic of the transducer.

REFERENCES:
patent: 3102991 (1963-09-01), Jess
patent: 3117241 (1964-01-01), Paynter et al.
patent: 3559158 (1971-01-01), Bettcher
patent: 3613068 (1971-10-01), Thompson et al.

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