A new low frequency piezoelectric composite transducer

D. Robertson, G. Hayward, A. Gachagan, J. Hyslop, V. Murray

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

Piezoelectric composite transducers have many recognised advantages for medium frequency (0.2 MHz-20 MHz) ultrasound applications. However, the extension to lower frequency bands has not been straightforward, especially with regard to active (i.e. transmission) behaviour. Manufacture from single ceramic blocks is problematic, due to polarisation limitations and inevitably, the low capacitance compromises transmit sensitivity. Alternative configurations, based on multilayered stacks can overcome most of these problems but introduce additional complexities with device manufacture and operational robustness. This paper presents a different method for manufacture of low frequency composites, utilising the fundamental symmetric Lamb mode (S0) in a conventional thickness drive piezoelectric plate. A composite plate, with electrodes positioned on the major faces, is driven at the fundamental frequency corresponding to the plate length dimension. This is shown to correspond with the S0 mode and demonstrates low loss, longitudinal wave propagation, with uniform surface displacement at the end faces that are normal to the direction of wave travel. A combination of experiment and finite element modelling using PZFlex is used to demonstrate the validity of this approach for low frequency (10 kHz-100kHz) 2-2 piezoelectric composite arrays. Measured coupling coefficients of approximately 0.5 for pzt5h ceramic and 0.8 for single crystal pmn-pt are shown to provide good agreement with theory as do laser scans of the radiating surface profile. The simulated TVR is superior to ceramic based tonpilz configurations of a similar frequency
LanguageEnglish
Pages1670-1673
Number of pages4
DOIs
Publication statusPublished - Aug 2004
Event2004 IEEE Ultrasonics Symposium - Montreal, Canada
Duration: 23 Aug 200427 Aug 2004

Conference

Conference2004 IEEE Ultrasonics Symposium
CountryCanada
CityMontreal
Period23/08/0427/08/04

Fingerprint

transducers
low frequencies
composite materials
ceramics
longitudinal waves
configurations
coupling coefficients
travel
wave propagation
capacitance
electrodes
sensitivity
single crystals
polarization
profiles
lasers

Keywords

  • low frequency
  • piezoelectric
  • composite transducer

Cite this

Robertson, D., Hayward, G., Gachagan, A., Hyslop, J., & Murray, V. (2004). A new low frequency piezoelectric composite transducer. 1670-1673. Paper presented at 2004 IEEE Ultrasonics Symposium , Montreal, Canada. https://doi.org/10.1109/ULTSYM.2004.1418144
Robertson, D. ; Hayward, G. ; Gachagan, A. ; Hyslop, J. ; Murray, V. / A new low frequency piezoelectric composite transducer. Paper presented at 2004 IEEE Ultrasonics Symposium , Montreal, Canada.4 p.
@conference{cda26495ae1742d0b3e990cabfa86b1e,
title = "A new low frequency piezoelectric composite transducer",
abstract = "Piezoelectric composite transducers have many recognised advantages for medium frequency (0.2 MHz-20 MHz) ultrasound applications. However, the extension to lower frequency bands has not been straightforward, especially with regard to active (i.e. transmission) behaviour. Manufacture from single ceramic blocks is problematic, due to polarisation limitations and inevitably, the low capacitance compromises transmit sensitivity. Alternative configurations, based on multilayered stacks can overcome most of these problems but introduce additional complexities with device manufacture and operational robustness. This paper presents a different method for manufacture of low frequency composites, utilising the fundamental symmetric Lamb mode (S0) in a conventional thickness drive piezoelectric plate. A composite plate, with electrodes positioned on the major faces, is driven at the fundamental frequency corresponding to the plate length dimension. This is shown to correspond with the S0 mode and demonstrates low loss, longitudinal wave propagation, with uniform surface displacement at the end faces that are normal to the direction of wave travel. A combination of experiment and finite element modelling using PZFlex is used to demonstrate the validity of this approach for low frequency (10 kHz-100kHz) 2-2 piezoelectric composite arrays. Measured coupling coefficients of approximately 0.5 for pzt5h ceramic and 0.8 for single crystal pmn-pt are shown to provide good agreement with theory as do laser scans of the radiating surface profile. The simulated TVR is superior to ceramic based tonpilz configurations of a similar frequency",
keywords = "low frequency , piezoelectric, composite transducer",
author = "D. Robertson and G. Hayward and A. Gachagan and J. Hyslop and V. Murray",
year = "2004",
month = "8",
doi = "10.1109/ULTSYM.2004.1418144",
language = "English",
pages = "1670--1673",
note = "2004 IEEE Ultrasonics Symposium ; Conference date: 23-08-2004 Through 27-08-2004",

}

Robertson, D, Hayward, G, Gachagan, A, Hyslop, J & Murray, V 2004, 'A new low frequency piezoelectric composite transducer' Paper presented at 2004 IEEE Ultrasonics Symposium , Montreal, Canada, 23/08/04 - 27/08/04, pp. 1670-1673. https://doi.org/10.1109/ULTSYM.2004.1418144

A new low frequency piezoelectric composite transducer. / Robertson, D.; Hayward, G.; Gachagan, A.; Hyslop, J.; Murray, V.

2004. 1670-1673 Paper presented at 2004 IEEE Ultrasonics Symposium , Montreal, Canada.

Research output: Contribution to conferencePaper

TY - CONF

T1 - A new low frequency piezoelectric composite transducer

AU - Robertson, D.

AU - Hayward, G.

AU - Gachagan, A.

AU - Hyslop, J.

AU - Murray, V.

PY - 2004/8

Y1 - 2004/8

N2 - Piezoelectric composite transducers have many recognised advantages for medium frequency (0.2 MHz-20 MHz) ultrasound applications. However, the extension to lower frequency bands has not been straightforward, especially with regard to active (i.e. transmission) behaviour. Manufacture from single ceramic blocks is problematic, due to polarisation limitations and inevitably, the low capacitance compromises transmit sensitivity. Alternative configurations, based on multilayered stacks can overcome most of these problems but introduce additional complexities with device manufacture and operational robustness. This paper presents a different method for manufacture of low frequency composites, utilising the fundamental symmetric Lamb mode (S0) in a conventional thickness drive piezoelectric plate. A composite plate, with electrodes positioned on the major faces, is driven at the fundamental frequency corresponding to the plate length dimension. This is shown to correspond with the S0 mode and demonstrates low loss, longitudinal wave propagation, with uniform surface displacement at the end faces that are normal to the direction of wave travel. A combination of experiment and finite element modelling using PZFlex is used to demonstrate the validity of this approach for low frequency (10 kHz-100kHz) 2-2 piezoelectric composite arrays. Measured coupling coefficients of approximately 0.5 for pzt5h ceramic and 0.8 for single crystal pmn-pt are shown to provide good agreement with theory as do laser scans of the radiating surface profile. The simulated TVR is superior to ceramic based tonpilz configurations of a similar frequency

AB - Piezoelectric composite transducers have many recognised advantages for medium frequency (0.2 MHz-20 MHz) ultrasound applications. However, the extension to lower frequency bands has not been straightforward, especially with regard to active (i.e. transmission) behaviour. Manufacture from single ceramic blocks is problematic, due to polarisation limitations and inevitably, the low capacitance compromises transmit sensitivity. Alternative configurations, based on multilayered stacks can overcome most of these problems but introduce additional complexities with device manufacture and operational robustness. This paper presents a different method for manufacture of low frequency composites, utilising the fundamental symmetric Lamb mode (S0) in a conventional thickness drive piezoelectric plate. A composite plate, with electrodes positioned on the major faces, is driven at the fundamental frequency corresponding to the plate length dimension. This is shown to correspond with the S0 mode and demonstrates low loss, longitudinal wave propagation, with uniform surface displacement at the end faces that are normal to the direction of wave travel. A combination of experiment and finite element modelling using PZFlex is used to demonstrate the validity of this approach for low frequency (10 kHz-100kHz) 2-2 piezoelectric composite arrays. Measured coupling coefficients of approximately 0.5 for pzt5h ceramic and 0.8 for single crystal pmn-pt are shown to provide good agreement with theory as do laser scans of the radiating surface profile. The simulated TVR is superior to ceramic based tonpilz configurations of a similar frequency

KW - low frequency

KW - piezoelectric

KW - composite transducer

U2 - 10.1109/ULTSYM.2004.1418144

DO - 10.1109/ULTSYM.2004.1418144

M3 - Paper

SP - 1670

EP - 1673

ER -

Robertson D, Hayward G, Gachagan A, Hyslop J, Murray V. A new low frequency piezoelectric composite transducer. 2004. Paper presented at 2004 IEEE Ultrasonics Symposium , Montreal, Canada. https://doi.org/10.1109/ULTSYM.2004.1418144