Wideband Electromagnetic Dynamic Acoustic Transducer as a Standard Acoustic Source for Air-coupled Ultrasonic Sensors

Kang, L., Feeney, A. , Somerset, W. and Dixon, S. (2019) Wideband Electromagnetic Dynamic Acoustic Transducer as a Standard Acoustic Source for Air-coupled Ultrasonic Sensors. In: 2019 IEEE International Ultrasonics Symposium (IUS), Glasgow, UK, 06-09 Oct 2019, pp. 2481-2484. ISBN 9781728145969 (doi:10.1109/ULTSYM.2019.8926271)

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Abstract

To experimentally study the characteristics of ultrasonic sensors, a wideband air-coupled ultrasonic transducer, wideband electromagnetic dynamic acoustic transducer (WEMDAT), is designed and fabricated. Characterisation methods, including electrical impedance analysis, laser Doppler vibrometry and pressure-field microphone measurement, are used to examine the performance of the WEMDAT, which have shown that the transducer has a wide bandwidth ranging approximately from 47 kHz to 145 kHz and a good directivity with a beam angle of around 20 with no evident side lobes. A 40 kHz commercial flexural ultrasonic transducer (FUT) is then taken as an example to receive ultrasonic waves in a pitch-catch configuration to evaluate the performance of the WEMDAT as an acoustic source. Experiment results have demonstrated that the WEMDAT can maintain the most of the frequency content of a 5 cycle 40 kHz tone burst electric signal and convert it into an ultrasonic wave for studying the dynamic characteristic and the directivity pattern of the ultrasonic receiver. A comparison of the dynamic characteristics between the transmitting and the receiving processes of the same FUT reveals that the FUT has a wider bandwidth when operating as an ultrasonic receiver than operating as a transmitter, which indicates that it is necessary to quantitatively investigate the receiving process of an ultrasonic transducer, demonstrating a huge potential of the WEMDAT serving as a standard acoustic source for ultrasonic sensors for various air-coupled ultrasonic applications.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Feeney, Dr Andrew
Authors: Kang, L., Feeney, A., Somerset, W., and Dixon, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
ISSN:1948-5727
ISBN:9781728145969
Published Online:09 December 2019
Copyright Holders:Copyright © 2019 IEEE
First Published:First published in 2019 IEEE International Ultrasonics Symposium (IUS): 2481-2484
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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