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Sensors 2018, 18(1), 270; doi:10.3390/s18010270

The Dynamic Performance of Flexural Ultrasonic Transducers

Department of Physics, University of Warwick, Coventry CV4 7AL, UK
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Received: 6 December 2017 / Revised: 9 January 2018 / Accepted: 16 January 2018 / Published: 18 January 2018
(This article belongs to the Special Issue Ultrasonic Sensors 2018)
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Abstract

Flexural ultrasonic transducers are principally used as proximity sensors and for industrial metrology. Their operation relies on a piezoelectric ceramic to generate a flexing of a metallic membrane, which delivers the ultrasound signal. The performance of flexural ultrasonic transducers has been largely limited to excitation through a short voltage burst signal at a designated mechanical resonance frequency. However, a steady-state amplitude response is not generated instantaneously in a flexural ultrasonic transducer from a drive excitation signal, and differences in the drive characteristics between transmitting and receiving transducers can affect the measured response. This research investigates the dynamic performance of flexural ultrasonic transducers using acoustic microphone measurements and laser Doppler vibrometry, supported by a detailed mechanical analog model, in a process which has not before been applied to the flexural ultrasonic transducer. These techniques are employed to gain insights into the physics of their vibration behaviour, vital for the optimisation of industrial ultrasound systems. View Full-Text
Keywords: flexural ultrasonic transducer; air-coupled ultrasound; dynamic characterisation flexural ultrasonic transducer; air-coupled ultrasound; dynamic characterisation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Feeney, A.; Kang, L.; Rowlands, G.; Dixon, S. The Dynamic Performance of Flexural Ultrasonic Transducers. Sensors 2018, 18, 270.

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