Finite element study of 2-2 piezocomposite transducer with random polymer properties

Haifeng Wang, Wenwu Cao

Research output: Contribution to journalConference article

Abstract

2-2 piezocomposite materials are widely used for ultrasonic transducers in medical ultrasound imaging and underwater acoustics. An important issue in 2-2 piezocomposite transducer designs is to avoid spurious lateral modes. We proposed a new method to solve the lateral mode problem in this paper. A 30-element 2-2 piezocomposite transducer composed of PZT-5H and five different types of polymers were studied by using ANSYS finite element software. Using a 2-D model of the transducer the electrical admittances were calculated within the interested frequency range. The results show that there is a strong coupling between the thickness mode and the first lateral mode when any one type of polymer is used in the transducer design. However, the lateral mode is greatly suppressed when all of these polymers are used, and the electromechanical coupling coefficient for the thickness mode is also increased. The analysis further shows that the reduction of the lateral mode is only related to the shear velocity of the polymer, while the density and longitudinal velocity of the polymer have little effect on it.

Original languageEnglish (US)
Pages (from-to)70-77
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5035
DOIs
StatePublished - Sep 12 2003
EventMedical Imaging 2003: Ultrasonic Imaging and Signal Processing - San Diego, CA, United States
Duration: Feb 18 2003Feb 20 2003

Fingerprint

Transducer
Transducers
Lateral
Polymers
transducers
Finite Element
polymers
Electromechanical Coupling
Underwater Acoustics
Ultrasonic transducers
Electromechanical coupling
Underwater acoustics
ANSYS
Strong Coupling
Ultrasound
acoustic imaging
underwater acoustics
Ultrasonics
Imaging
electrical impedance

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

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abstract = "2-2 piezocomposite materials are widely used for ultrasonic transducers in medical ultrasound imaging and underwater acoustics. An important issue in 2-2 piezocomposite transducer designs is to avoid spurious lateral modes. We proposed a new method to solve the lateral mode problem in this paper. A 30-element 2-2 piezocomposite transducer composed of PZT-5H and five different types of polymers were studied by using ANSYS finite element software. Using a 2-D model of the transducer the electrical admittances were calculated within the interested frequency range. The results show that there is a strong coupling between the thickness mode and the first lateral mode when any one type of polymer is used in the transducer design. However, the lateral mode is greatly suppressed when all of these polymers are used, and the electromechanical coupling coefficient for the thickness mode is also increased. The analysis further shows that the reduction of the lateral mode is only related to the shear velocity of the polymer, while the density and longitudinal velocity of the polymer have little effect on it.",
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Finite element study of 2-2 piezocomposite transducer with random polymer properties. / Wang, Haifeng; Cao, Wenwu.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 5035, 12.09.2003, p. 70-77.

Research output: Contribution to journalConference article

TY - JOUR

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AU - Wang, Haifeng

AU - Cao, Wenwu

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N2 - 2-2 piezocomposite materials are widely used for ultrasonic transducers in medical ultrasound imaging and underwater acoustics. An important issue in 2-2 piezocomposite transducer designs is to avoid spurious lateral modes. We proposed a new method to solve the lateral mode problem in this paper. A 30-element 2-2 piezocomposite transducer composed of PZT-5H and five different types of polymers were studied by using ANSYS finite element software. Using a 2-D model of the transducer the electrical admittances were calculated within the interested frequency range. The results show that there is a strong coupling between the thickness mode and the first lateral mode when any one type of polymer is used in the transducer design. However, the lateral mode is greatly suppressed when all of these polymers are used, and the electromechanical coupling coefficient for the thickness mode is also increased. The analysis further shows that the reduction of the lateral mode is only related to the shear velocity of the polymer, while the density and longitudinal velocity of the polymer have little effect on it.

AB - 2-2 piezocomposite materials are widely used for ultrasonic transducers in medical ultrasound imaging and underwater acoustics. An important issue in 2-2 piezocomposite transducer designs is to avoid spurious lateral modes. We proposed a new method to solve the lateral mode problem in this paper. A 30-element 2-2 piezocomposite transducer composed of PZT-5H and five different types of polymers were studied by using ANSYS finite element software. Using a 2-D model of the transducer the electrical admittances were calculated within the interested frequency range. The results show that there is a strong coupling between the thickness mode and the first lateral mode when any one type of polymer is used in the transducer design. However, the lateral mode is greatly suppressed when all of these polymers are used, and the electromechanical coupling coefficient for the thickness mode is also increased. The analysis further shows that the reduction of the lateral mode is only related to the shear velocity of the polymer, while the density and longitudinal velocity of the polymer have little effect on it.

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