Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1977-11-11
1980-08-19
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
73612, 367901, 367903, G01S 966
Patent
active
042187680
ABSTRACT:
Each receiving or transmitting circuit for a respective transducer element includes an individually controllable buffer amplifier which is so operated as to avoid detrimental switching transients. For example, the buffer amplifiers in the receiving circuit may have input switches closed immediately after a transmit pulse and prior to the actual receiving phase. Then output switches of the buffer amplifiers to be activated are closed in the receiving phase, but transients so produced are blocked by the high reverse attenuation of the buffer amplifiers. The input switches may be actuated prior to activation of the transducer elements in receive mode and may serve to simultaneously supply operating voltage to the respective associated buffer amplifiers, the buffer amplifiers all being switched off during transmit mode to block transmit energy from non-active transducers. The transducers of a column of a transducer array may have their outputs summed by means of the buffer amplifiers acting as a voltage controlled current sources.
REFERENCES:
patent: 3233121 (1966-02-01), Chou
patent: 3789350 (1974-01-01), Rolle
patent: 3815409 (1974-06-01), Macovski
patent: 3881466 (1975-05-01), Wilcox
patent: 3895525 (1975-07-01), Eichelberger et al.
patent: 3916676 (1975-04-01), Boggs et al.
patent: 3936791 (1976-02-01), Kossoff
patent: 4012952 (1977-03-01), Dory
Farley Richard A.
Siemens Aktiengesellschaft
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