The influence of air pressure on the dynamics of flexural ultrasonic transducers

Feeney, A. , Kang, L., Somerset, W. E. and Dixon, S. (2019) The influence of air pressure on the dynamics of flexural ultrasonic transducers. Sensors, 19(21), 4710. (doi: 10.3390/s19214710)

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The flexural ultrasonic transducer comprises a piezoelectric ceramic disc bonded to a membrane. The vibrations of the piezoelectric ceramic disc induce flexural modes in the membrane, producing ultrasound waves. The transducer is principally utilized for proximity or flow measurement, designed for operation at atmospheric pressure conditions. However, there is rapidly growing industrial demand for the flexural ultrasonic transducer in applications including water metering or in petrochemical plants where the pressure levels of the gas or liquid environment can approach 100 bar. In this study, characterization methods including electrical impedance analysis and pitch-catch ultrasound measurement are employed to demonstrate the dynamic performance of flexural ultrasonic transducers in air at elevated pressures approaching 100 bar. Measurement principles are discussed, in addition to modifications to the transducer design for ensuring resilience at increasing air pressure levels. The results highlight the importance of controlling the parameters of the measurement environment and show that although the conventional design of flexural ultrasonic transducer can exhibit functionality towards 100 bar, its dynamic performance is unsuitable for accurate ultrasound measurement. It is anticipated that this research will initiate new developments in ultrasound measurement systems for fluid environments at elevated pressures.

Item Type:Articles
Additional Information:This research was funded by EPSRC grant number EP/N025393/1.
Glasgow Author(s) Enlighten ID:Feeney, Dr Andrew
Authors: Feeney, A., Kang, L., Somerset, W. E., and Dixon, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Sensors
ISSN (Online):1424-8220
Published Online:30 October 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Sensors 19(21): 4710
Publisher Policy:Reproduced under a Creative Commons License

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