Enhancing the bandwidth of piezoelectric composite transducers for air-coupled non-destructive evaluation
Banks, Robert and O'Leary, Richard L. and Hayward, Gordon (2017) Enhancing the bandwidth of piezoelectric composite transducers for air-coupled non-destructive evaluation. Ultrasonics, 75. 132–144. ISSN 0041-624X (https://doi.org/10.1016/j.ultras.2016.10.007)
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Abstract
This paper details the development of a novel method for increasing the operational bandwidth of piezocomposites without the need for lossy backing material, the aim being to increase fractional bandwith by geometrical design. Removing the need for lossy backing materials, should in turn increase the transmit efficiency in the desired direction of propagation. Finite element analysis has been employed to determine the mode of operation of the new piezocomposite devices and shows good correlation with that derived experimentally. Through a series of practical and analytical methods it has been shown that additional thickness mode resonances can be introduced into the structure by a simple machining process. The shaped composites described in this paper offer increased operational bandwidth. A simple example of a two step thickness design is described to validate and illustrate the principle. A more complex conical design is presented that illustrates a possible tenfold increase in bandwidth from 30kHz to 300kHz, operating in air without backing. An illustration of the applicability of this type of transducer technology for frequency agile guided mode non-destructive evaluation is then presented.
ORCID iDs
Banks, Robert, O'Leary, Richard L. ORCID: https://orcid.org/0000-0002-4092-2101 and Hayward, Gordon;-
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Item type: Article ID code: 58182 Dates: DateEvent31 March 2017Published19 October 2016Published Online14 October 2016AcceptedSubjects: Science > Physics Department: Faculty of Engineering > Electronic and Electrical Engineering
Technology and Innovation Centre > Sensors and Asset ManagementDepositing user: Pure Administrator Date deposited: 18 Oct 2016 11:57 Last modified: 12 Dec 2024 04:48 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/58182