Ultrasonic Flow Meter With Subsampling of Ultrasonic Transducer Signals

摘要

An ultrasonic flow meter is disclosed, including a switching unit for switching electrical transmission signals between a signal generator and at least two ultrasonic transducers and for switching electrical reception signal between the transducers and a receiver circuit, wherein the switching unit is coupled to an output terminal of an operational amplifier of the signal generator and to an inverting input terminal of an operational amplifier of the receiver circuit. Furthermore, a method for characterizing an ultrasonic transducer is disclosed, including the step of determining directly from one or more supply current signals for an active component of a signal generator one or more quantities useful for characterizing the transducer. Furthermore, a method for determining the time delay of an ultrasonic signal in a flow path of an ultrasonic flow meter is disclosed, including the step of comparing physically transmitted, delayed and received signals with simulated non-delayed signals.

主权项

1. An ultrasonic flow meter comprising at least one ultrasonic transducer and a signal generator for generating electrical signals to the at least one transducer, the signal generator comprising an active component,
wherein the ultrasonic flow meter comprises a current measuring arrangement configured to measure at least one power supply current to said active component of said signal generator to establish at least one supply current signal.