| 摘要 |
The invention relates to an arrangement for signal processing in ultrasonic transducers in flow meters, wherein the ultrasonic transducer is acted upon by a drive signal, the ultrasonic transducer being connected to a resonant circuit matched to the frequency of the drive signal. The resonant circuit can be, in particular, a component of a network, which makes possible a switching over of an ultrasonic transducer from a transmitting operation to a receiving operation. The present invention further relates to an ultrasonic flow meter according to the time-of-flight principle, with means for transmitting and receiving ultrasonic signals as well as means for signal post-processing of the received ultrasonic signals. For accomplishing the task according to the invention, namely, to make available an ultrasonic flow meter that produces an improved-quality voltage signal for evaluation and, at the same time, makes possible a reduction of its production costs, a ringing circuit is provided, in particular a series ringing circuit, as a means for signal post-processing of the received ultrasonic signals, the ringing circuit being connected to a comparator. The ringing circuit appropriately realizes an LC-circuit, a Pi-filter, or an RLC-circuit.
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