PHASE CONTROLLED VARIABLE ANGLE ULTRASONIC FLOW METER

摘要

An ultrasonic flowmeter includes a conduit for receiving a flow of a fluid and a flexible printed circuit board (FPC) including: a pair of ultrasonic transducers, wherein each transducer comprises a piezoelectric element divided into a plurality of segment electrodes and the FPC is bonded around the conduit; and a control circuit configured to sequentially activate the segment electrodes using a pulse train to cause at least one of the piezoelectric elements to emit a sonic signal. A delay time between activation of each successive segment electrode controls a phase velocity and an angle of emission of the corresponding sonic signal.

主权项

1. An ultrasonic flowmeter comprising:
a conduit for receiving a flow of a fluid; a flexible printed circuit board (FPC) comprising:
a pair of ultrasonic transducers, wherein each transducer comprises a piezoelectric element divided into a plurality of segment electrodes and the FPC is bonded around the conduit; anda control circuit configured to sequentially activate the segment electrodes using a pulse train to cause at least one of the piezoelectric elements to emit a sonic signal,wherein a delay time between activation of each successive segment electrode controls a phase velocity and an angle of emission of the corresponding sonic signal.