Ultrasonic device comprising an active impedance matching device

Details Ultrasonic device comprising an active impedance matching device Ultrasonic device comprising an active impedance matching device

1993-10-27

1995-01-31

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

H04B 100

Patent

active

053863950

ABSTRACT:
An ultrasonic active impedance matching device between an ultrasonic transducer and a generator of pulses includes an interface stage (100) and a matching stage (200) which are connected by way of a coaxial cable (150) having an impedance of 50 ohms. The interface stage (100) has a sub-assembly (10, 11, 12, 13, 14) for generating a d.c. signal having an amplitude which is proportional to but smaller than the peak value of the pulses, a sub-assembly (15, 16, 17 50) for generating a low-voltage pulse which is matched with the impedance of the cable, and a programmable power supply (18) for producing a d.c. voltage which is applied to the transducer via the cable. The matching stage (200) has a sub-assembly (19) for transmitting the excitation pulse of the transducer (2) and a receiving sub-assembly (20, 21) for returning the echographic signal to the generator (1) via the cable (150).

REFERENCES:
patent: 4752918 (1988-06-01), Boucher et al.
patent: 5243988 (1993-09-01), Siben et al.

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