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Venting in the comparative study of flexural ultrasonic transducers to improve resilience at elevated environmental pressure levels

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Feeney, Andrew, Kang, Lei, Somerset, William and Dixon, Steve M. (2020) Venting in the comparative study of flexural ultrasonic transducers to improve resilience at elevated environmental pressure levels. IEEE Sensors Journal, 20 (11). pp. 5776-5784. doi:10.1109/JSEN.2020.2974547 ISSN 1530-437X.

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Official URL: http://dx.doi.org/10.1109/JSEN.2020.2974547

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Abstract

The classical form of a flexural ultrasonic transducer is a piezoelectric ceramic disc bonded to a circular metallic membrane. This ceramic induces vibration modes of the membrane for the generation and detection of ultrasound. The transducer has been popular for proximity sensing and metrology, particularly for industrial applications at ambient pressures around 1 bar. The classical flexural ultrasonic transducer is not designed for operation at elevated pressures, such as those associated with natural gas transportation or petrochemical processes. It is reliant on a rear seal which forms an internal air cavity, making the transducer susceptible to deformation through pressure imbalance. The application potential of the classical transducer is therefore severely limited. In this study, a venting strategy which balances the pressure between the internal transducer structure and the external environment is studied through experimental methods including electrical impedance analysis and pitch-catch ultrasound measurement. The vented transducer is compared with a commercial equivalent in air towards 90 bar. Venting is shown to be viable for a new generation of low cost and robust industrial ultrasonic transducers, suitable for operation at high environmental pressure levels.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Ultrasonic transducers, Pressure -- Measurement
Journal or Publication Title: IEEE Sensors Journal
Publisher: Institute of Electrical and Electronic Engineers
ISSN: 1530-437X
Official Date: 1 June 2020
Dates:
DateEvent
1 June 2020Published
21 February 2020Available
14 February 2020Accepted
Volume: 20
Number: 11
Page Range: pp. 5776-5784
DOI: 10.1109/JSEN.2020.2974547
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 9 March 2020
Date of first compliant Open Access: 12 March 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N025393/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

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