Improving the bandwith of 1-3 connectivity composite receivers using mode coupling

Anthony Gachagan, Gordon Hayward

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Temporal resolution in an ultrasonic system may be enhanced by the application of mechanical damping to the transducer rear face, thereby reducing internal reverberation and increasing effective bandwidth. However, for thickness drive transducers, this is accompanied inevitably by a reduction in sensitivity and, moreover, manufacture of suitable damping blocks can be difficult, particularly for lower frequency, small signal applications such as the detection of gas coupled ultrasound. This work describes an interesting alternative approach that utilizes the relatively strong coupling between the fundamental thickness mode and first lateral mode in 1-3 connectivity piezocomposite transducers.Finite elementmodeling is used to evaluate the influence of mode interaction on electromechanical coupling efficiency, surface displacement, sensitivity, and bandwidth as functions of the ceramic pillar dimensions for operation into both water and air load media. A range of composite devices was constructed and close agreement between theory and experiment is demonstrated, with a measured device bandwidth of 130% centered at 1.15 MHz. An example of using such a device within a gas-coupled ultrasonic system is presented and the response is shown to compare favorably with alternative transducer configurations.
LanguageEnglish
Pages3344-3352
Number of pages9
JournalJournal of the Acoustical Society of America
Volume103
Issue number6
DOIs
Publication statusPublished - 1998

Fingerprint

coupled modes
Transducers
transducers
receivers
composite materials
Ultrasonics
Composite materials
bandwidth
Bandwidth
Damping
ultrasonics
damping
Electromechanical coupling
Reverberation
sensitivity
reverberation
temporal resolution
Gases
gases
ceramics

Keywords

  • 1-3 connectivity composite receivers
  • mode coupling
  • bandwith

Cite this

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title = "Improving the bandwith of 1-3 connectivity composite receivers using mode coupling",
abstract = "Temporal resolution in an ultrasonic system may be enhanced by the application of mechanical damping to the transducer rear face, thereby reducing internal reverberation and increasing effective bandwidth. However, for thickness drive transducers, this is accompanied inevitably by a reduction in sensitivity and, moreover, manufacture of suitable damping blocks can be difficult, particularly for lower frequency, small signal applications such as the detection of gas coupled ultrasound. This work describes an interesting alternative approach that utilizes the relatively strong coupling between the fundamental thickness mode and first lateral mode in 1-3 connectivity piezocomposite transducers.Finite elementmodeling is used to evaluate the influence of mode interaction on electromechanical coupling efficiency, surface displacement, sensitivity, and bandwidth as functions of the ceramic pillar dimensions for operation into both water and air load media. A range of composite devices was constructed and close agreement between theory and experiment is demonstrated, with a measured device bandwidth of 130{\%} centered at 1.15 MHz. An example of using such a device within a gas-coupled ultrasonic system is presented and the response is shown to compare favorably with alternative transducer configurations.",
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Improving the bandwith of 1-3 connectivity composite receivers using mode coupling. / Gachagan, Anthony; Hayward, Gordon.

In: Journal of the Acoustical Society of America, Vol. 103, No. 6, 1998, p. 3344-3352.

Research output: Contribution to journalArticle

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AU - Gachagan, Anthony

AU - Hayward, Gordon

PY - 1998

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AB - Temporal resolution in an ultrasonic system may be enhanced by the application of mechanical damping to the transducer rear face, thereby reducing internal reverberation and increasing effective bandwidth. However, for thickness drive transducers, this is accompanied inevitably by a reduction in sensitivity and, moreover, manufacture of suitable damping blocks can be difficult, particularly for lower frequency, small signal applications such as the detection of gas coupled ultrasound. This work describes an interesting alternative approach that utilizes the relatively strong coupling between the fundamental thickness mode and first lateral mode in 1-3 connectivity piezocomposite transducers.Finite elementmodeling is used to evaluate the influence of mode interaction on electromechanical coupling efficiency, surface displacement, sensitivity, and bandwidth as functions of the ceramic pillar dimensions for operation into both water and air load media. A range of composite devices was constructed and close agreement between theory and experiment is demonstrated, with a measured device bandwidth of 130% centered at 1.15 MHz. An example of using such a device within a gas-coupled ultrasonic system is presented and the response is shown to compare favorably with alternative transducer configurations.

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