Abstract
The geometry of composite piezoelectric ultrasonic transducers is typically regular and periodic with one dominant length scale. In many applications there is motivation to design transducers that operate over a wide bandwidth so that, for example, signals containing a broad frequency content can be received. The device’s length scale will dictate the central operating frequency of the device and so, in order to construct a wide bandwidth device, it would seem natural to design a device that contains a range of length scales. The objective of this article therefore is to consider one such transducer design and build a theoretical model to assess its performance. For the composite geometry a fractal medium is chosen as this contains a wide range of length scales. Numerical results of a theoretical model are presented. They suggest that this device would have a three-fold improvement in the reception sensitivity bandwidth as compared to a conventional composite design. Finite-element analysis provides information on the effect of poling on the device’s performance. A preliminary experimental investigation was undertaken, with a Sierpinski gasket fractal transducer design, and good correlation between the simulated and experimentally measured operation was observed.
Original language | English |
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Title of host publication | 2011 IEEE International Ultrasonics Symposium |
Place of Publication | Piscataway, NJ |
Publisher | IEEE |
Pages | 1559-1562 |
Number of pages | 4 |
ISBN (Print) | 9781457712531 |
DOIs | |
Publication status | Published - 5 Sept 2012 |
Externally published | Yes |
Event | 2011 IEEE International Ultrasonics Symposium - Caribe Royale, Orlando , United States Duration: 18 Oct 2011 → 21 Oct 2011 |
Conference
Conference | 2011 IEEE International Ultrasonics Symposium |
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Country/Territory | United States |
City | Orlando |
Period | 18/10/11 → 21/10/11 |
Keywords
- Fractals
- Transducers
- Gaskets
- Sensitivity
- Acoustics
- Performance evaluation