Measuring and testing – Vibration – By mechanical waves
Patent
1980-10-16
1983-08-23
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73633, 128660, G01N 2904
Patent
active
043997031
ABSTRACT:
A real-time ultrasonic transducer for use in a scanning system and a novel drive circuit therefor are provided. The transducer includes a housing and a transducer assembly mounted therein for movement in a predetermined manner. An electromagnet causes the transducer assembly to move in such a predetermined manner. The drive circuit reverses the polarity of the voltage applied to the electromagnet when the transducer assembly reaches a predetermined limit of movement thereby reversing the direction of movement thereof. The drive circuit and the transducer assembly are located within the transducer housing. The drive circuit includes a set-reset (R-S) flip-flop that reverses the polarity of the voltage applied to the electromagnet. The two conventional collector resistors of the flip-flop are each replaced by a transistor circuit thereby providing the R-S flip-flop with power amplification capability. The ultrasonic transducer can include a circuit for generating a signal related to the actual position of the transducer assembly. That signal is used by the scanning system to synchronize image creation with transducer assembly movement.
REFERENCES:
patent: 4092867 (1978-06-01), Matzuk
patent: 4149419 (1979-04-01), Connell, Jr. et al.
Cornelius Andrew J.
Dymax Corporation
Kreitman Stephen A.
Yeager Robert D.
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