Broadband 1-3 piezoelectric composite transducer design using Sierpinski Gasket fractal geometry
Fang, Haoyu and Qiu, Zhen and Mulholland, Anthony J. and O'Leary, Richard L. and Gachagan, Anthony (2018) Broadband 1-3 piezoelectric composite transducer design using Sierpinski Gasket fractal geometry. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 65 (12). pp. 2429-2439. ISSN 0885-3010 (https://doi.org/10.1109/TUFFC.2018.2874384)
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Abstract
Wider operational bandwidth is an important requirement of an ultrasound transducer across many applications. In nature, it can be observed that several hearing organs possess a broad operating bandwidth by having a varying length scales structure. Moreover, conventional 1-3 piezoelectric composite transducers have been widely recognized for their wider bandwidth over their piezoelectric ceramic counterparts. In this paper, a novel 1-3 piezoelectric composite design using a fractal geometry, known as the Sierpinski Gasket (SG), is proposed in order to explore the potential of further extending the operational bandwidth and sensitivity of the transducer. Two equivalent 1-3 piezocomposite designs are compared to this end, one with a conventional periodic parallelepiped shaped pillar structure and one with the SG fractal geometry, both theoretically, using a finite element (FE) analysis package, and experimentally. The transmit voltage response and open circuit voltage response are used to illustrate bandwidth improvement from the fractal composite design. Following the simulation results, a 580 kHz single element transducer, utilizing the proposed SG fractal microstructure, is fabricated using a pillar placement methodology. The performance of the prototyped device is characterized and compared with a conventional 1-3 composite design, as well as with a commercial ultrasound transducer. In the one-way transmission mode, a bandwidth improvement of 27.2 % and sensitivity enhancement of 3.8 dB can be found with the SG fractal design compared to an equivalent conventional composite design and up 105.1 % bandwidth improvement when compared to the commercial transducer. In the one-way reception mode, the bandwidth improvement for the SG fractal design is 2.5 % and 32.9 % when compared to the conventional and commercial transducers, respectively.
ORCID iDs
Fang, Haoyu ORCID: https://orcid.org/0000-0002-6531-0486, Qiu, Zhen ORCID: https://orcid.org/0000-0002-6219-7158, Mulholland, Anthony J. ORCID: https://orcid.org/0000-0002-3626-4556, O'Leary, Richard L. ORCID: https://orcid.org/0000-0002-4092-2101 and Gachagan, Anthony ORCID: https://orcid.org/0000-0002-9728-4120;-
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Item type: Article ID code: 65693 Dates: DateEvent31 December 2018Published8 October 2018Published Online2 October 2018AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering
Faculty of Science > Mathematics and StatisticsDepositing user: Pure Administrator Date deposited: 04 Oct 2018 15:22 Last modified: 05 Dec 2024 01:15 URI: https://strathprints.strath.ac.uk/id/eprint/65693