| 摘要 |
The invention relates to an ultrasonic measurement circuit of the type having an ultrasonic converter connected by a line to a transmission pulse generator. The circuit may have two transducers which operate alternately as a transmitter and a receiver and, in this case, the circuit also has a receiver amplifier. A resistor for preventing reflections is provided in the line between the pulse generator and the ultrasonic transducer which resistor is adapted to the wave resistance of the line. The pulse generator is shunted by a branch line having a switching device which becomes conductive at the end of the transmission impulse. |
