Flexible ultrasonic transducers incorporating piezoelectric fibres

G. Harvey, A. Gachagan, J.W. Mackersie, Thomas F. McCunnie, R.A. Banks

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

It is possible to produce a high-performance, flexible 1-3 connectivity piezoelectric ceramic composite with conventional methods but the process is difficult and time-consuming. Extensive finite element modeling was used to design a piezocomposite structure which incorporated randomly positioned piezoceramic fibers in a polymer matrix. Simple manufacturing techniques were developed which resulted in the production of large numbers of fully populated fiber composites that offered performance comparable with a conventional 1-3 piezocomposite. A modified process facilitated the production of efficient fiber piezocomposite elements separated by polymer channels which conformed to a highly flexible (13 mm radius of curvature), 2-D matrix array configuration. This arrangement has been termed a Composite Element Composite Array Transducer, or CECAT. These devices were evaluated in terms of their impedance spectra, pulse-echo response, and surface displacement characteristics. The random piezoceramic fiber arrangements showed comparable sensitivity and bandwidth to periodic devices while minimizing the parasitic interpillar modes associated with periodic structures. Investigations have indicated that CECAT arrays constructed with 250 mum diameter fibers can be operated at frequencies of up to 3 MHz and transducers incorporating 10 mum diameter fibers can extend the frequency range above 6 MHz. Conversely, improved low-frequency devices can be produced with taller pillars than possible with conventional manufacturing techniques.
LanguageEnglish
Pages1999-2009
Number of pages11
JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Volume56
Issue number9
DOIs
Publication statusPublished - Feb 2009

Fingerprint

Ultrasonic transducers
piezoelectric transducers
ultrasonics
fibers
Fibers
Composite materials
composite materials
transducers
manufacturing
Transducers
fiber composites
piezoelectric ceramics
polymers
matrices
Piezoelectric ceramics
Periodic structures
echoes
Polymer matrix
frequency ranges
curvature

Keywords

  • acoustic impedance
  • fibre reinforced composites
  • filled polymers
  • finite element analysis
  • piezoceramics
  • ultrasonic transducer arrays

Cite this

Harvey, G. ; Gachagan, A. ; Mackersie, J.W. ; McCunnie, Thomas F. ; Banks, R.A. / Flexible ultrasonic transducers incorporating piezoelectric fibres. In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 2009 ; Vol. 56, No. 9. pp. 1999-2009.
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Flexible ultrasonic transducers incorporating piezoelectric fibres. / Harvey, G.; Gachagan, A.; Mackersie, J.W.; McCunnie, Thomas F.; Banks, R.A.

In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 56, No. 9, 02.2009, p. 1999-2009.

Research output: Contribution to journalArticle

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AB - It is possible to produce a high-performance, flexible 1-3 connectivity piezoelectric ceramic composite with conventional methods but the process is difficult and time-consuming. Extensive finite element modeling was used to design a piezocomposite structure which incorporated randomly positioned piezoceramic fibers in a polymer matrix. Simple manufacturing techniques were developed which resulted in the production of large numbers of fully populated fiber composites that offered performance comparable with a conventional 1-3 piezocomposite. A modified process facilitated the production of efficient fiber piezocomposite elements separated by polymer channels which conformed to a highly flexible (13 mm radius of curvature), 2-D matrix array configuration. This arrangement has been termed a Composite Element Composite Array Transducer, or CECAT. These devices were evaluated in terms of their impedance spectra, pulse-echo response, and surface displacement characteristics. The random piezoceramic fiber arrangements showed comparable sensitivity and bandwidth to periodic devices while minimizing the parasitic interpillar modes associated with periodic structures. Investigations have indicated that CECAT arrays constructed with 250 mum diameter fibers can be operated at frequencies of up to 3 MHz and transducers incorporating 10 mum diameter fibers can extend the frequency range above 6 MHz. Conversely, improved low-frequency devices can be produced with taller pillars than possible with conventional manufacturing techniques.

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