Experimental assessment of periodic piezoelectric composite arrays incorporating an anisotropic passive phase

R.L. O'Leary, A.C.S. Parr, G. Hayward, A. Troge, R.A. Pethrick

Research output: Contribution to conferencePaper

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Abstract

This paper discusses the experimental assessment of a number of piezoelectric composite array structures incorporating a novel passive phase exhibiting anisotropic elastic properties. The passive polymer phase has been designed to limit inter-element crosstalk by attenuating lateral propagation across the array aperture. A selection of water coupled linear array coupons, operating with a nominal 400 kHz fundamental thickness mode frequency, has been prepared comprising the novel anisotropic passive phase. As a control, comparisons are made to similarly configured devices employing isotropic filler materials. Scanning laser vibrometry and measurements of electrical impedance characteristic on the array substrate demonstrate that the fundamental thickness mode of the devices configured with anisotropic polymer fillers is not contaminated by parasitic modes of vibration. The reasons for this are explained by considering the dispersion characteristics of the substrate. Water coupled hydrophone measurements of array element directivity; transmit voltage response and subsequently efficiency calculations illustrate that the observed reduction in mechanical cross talk has not been achieved at the expense of element sensitivity. Finally, comparisons between the experimental data and the PZFlex derived array responses are made, with good corroboration demonstrated
Original languageEnglish
Pages1907-1910
Number of pages3
DOIs
Publication statusPublished - 2007
EventIEEE Ultrasonics Symposium 2006 - Vancouver, Canada
Duration: 2 Oct 20066 Oct 2006

Conference

ConferenceIEEE Ultrasonics Symposium 2006
CountryCanada
CityVancouver
Period2/10/066/10/06

Fingerprint

Fillers
Hydrophones
Acoustic impedance
Composite materials
Polymers
Substrates
Crosstalk
Water
Scanning
Lasers
Electric potential

Keywords

  • piezoelectric composite array
  • anisotropic passive polymer phase

Cite this

O'Leary, R. L., Parr, A. C. S., Hayward, G., Troge, A., & Pethrick, R. A. (2007). Experimental assessment of periodic piezoelectric composite arrays incorporating an anisotropic passive phase. 1907-1910. Paper presented at IEEE Ultrasonics Symposium 2006, Vancouver, Canada. https://doi.org/10.1109/ULTSYM.2006.486
O'Leary, R.L. ; Parr, A.C.S. ; Hayward, G. ; Troge, A. ; Pethrick, R.A. / Experimental assessment of periodic piezoelectric composite arrays incorporating an anisotropic passive phase. Paper presented at IEEE Ultrasonics Symposium 2006, Vancouver, Canada.3 p.
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O'Leary, RL, Parr, ACS, Hayward, G, Troge, A & Pethrick, RA 2007, 'Experimental assessment of periodic piezoelectric composite arrays incorporating an anisotropic passive phase' Paper presented at IEEE Ultrasonics Symposium 2006, Vancouver, Canada, 2/10/06 - 6/10/06, pp. 1907-1910. https://doi.org/10.1109/ULTSYM.2006.486

Experimental assessment of periodic piezoelectric composite arrays incorporating an anisotropic passive phase. / O'Leary, R.L.; Parr, A.C.S.; Hayward, G.; Troge, A.; Pethrick, R.A.

2007. 1907-1910 Paper presented at IEEE Ultrasonics Symposium 2006, Vancouver, Canada.

Research output: Contribution to conferencePaper

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AB - This paper discusses the experimental assessment of a number of piezoelectric composite array structures incorporating a novel passive phase exhibiting anisotropic elastic properties. The passive polymer phase has been designed to limit inter-element crosstalk by attenuating lateral propagation across the array aperture. A selection of water coupled linear array coupons, operating with a nominal 400 kHz fundamental thickness mode frequency, has been prepared comprising the novel anisotropic passive phase. As a control, comparisons are made to similarly configured devices employing isotropic filler materials. Scanning laser vibrometry and measurements of electrical impedance characteristic on the array substrate demonstrate that the fundamental thickness mode of the devices configured with anisotropic polymer fillers is not contaminated by parasitic modes of vibration. The reasons for this are explained by considering the dispersion characteristics of the substrate. Water coupled hydrophone measurements of array element directivity; transmit voltage response and subsequently efficiency calculations illustrate that the observed reduction in mechanical cross talk has not been achieved at the expense of element sensitivity. Finally, comparisons between the experimental data and the PZFlex derived array responses are made, with good corroboration demonstrated

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O'Leary RL, Parr ACS, Hayward G, Troge A, Pethrick RA. Experimental assessment of periodic piezoelectric composite arrays incorporating an anisotropic passive phase. 2007. Paper presented at IEEE Ultrasonics Symposium 2006, Vancouver, Canada. https://doi.org/10.1109/ULTSYM.2006.486