"Pipe organ" inspired air-coupled ultrasonic transducers with broader bandwidth

Botong Zhu, Benjamin P. Tiller, Alan J. Walker, A. J. Mulholland, James F. C. Windmill

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Piezoelectric micromachined ultrasonic transducers (PMUTs) are used to receive and transmit ultrasonic signals in industrial and biomedical applications. This type of transducer can be miniaturized and integrated with electronic systems since each element is small and the power requirements are low. The bandwidth of the PMUT may be narrow in some conventional designs, however it is possible to apply modified structures to enhance this. This paper presents a methodology for improving the bandwidth of air-coupled PMUTs without sensitivity loss by connecting a number of resonating pipes of various length to a cavity. A prototype piezoelectric diaphragm ultrasonic transducer is presented to prove the theory. This novel device was fabricated by additive manufacturing (3D printing), and consists of a PVDF thin film over a stereolithography designed backplate. The backplate design is inspired by a pipe organ musical instrument, where the resonant frequency (pitch) of each pipe is mainly determined by its length. The -6dB bandwidth of the “pipe organ” air-coupled transducer is 55.7% and 58.5% in transmitting and receiving modes, respectively, which is ~5 times wider than a custom-built standard device.
LanguageEnglish
Pages1873-1881
Number of pages9
JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Volume65
Issue number10
Early online date31 Jul 2018
DOIs
Publication statusPublished - 1 Oct 2018

Fingerprint

Ultrasonic transducers
organs
Piezoelectric transducers
transducers
ultrasonics
Pipe
bandwidth
Bandwidth
air
Air
Organs (musical instruments)
Transducers
3D printers
Musical instruments
Stereolithography
Diaphragms
Printing
Natural frequencies
Ultrasonics
diaphragms

Keywords

  • air coupled transducers
  • 3D print
  • additive manufacture
  • broad bandwidth
  • PVDF
  • piezo electric ultrasonic transducer

Cite this

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abstract = "Piezoelectric micromachined ultrasonic transducers (PMUTs) are used to receive and transmit ultrasonic signals in industrial and biomedical applications. This type of transducer can be miniaturized and integrated with electronic systems since each element is small and the power requirements are low. The bandwidth of the PMUT may be narrow in some conventional designs, however it is possible to apply modified structures to enhance this. This paper presents a methodology for improving the bandwidth of air-coupled PMUTs without sensitivity loss by connecting a number of resonating pipes of various length to a cavity. A prototype piezoelectric diaphragm ultrasonic transducer is presented to prove the theory. This novel device was fabricated by additive manufacturing (3D printing), and consists of a PVDF thin film over a stereolithography designed backplate. The backplate design is inspired by a pipe organ musical instrument, where the resonant frequency (pitch) of each pipe is mainly determined by its length. The -6dB bandwidth of the “pipe organ” air-coupled transducer is 55.7{\%} and 58.5{\%} in transmitting and receiving modes, respectively, which is ~5 times wider than a custom-built standard device.",
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"Pipe organ" inspired air-coupled ultrasonic transducers with broader bandwidth. / Zhu, Botong; Tiller, Benjamin P.; Walker, Alan J.; Mulholland, A. J.; Windmill, James F. C.

In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 65, No. 10, 01.10.2018, p. 1873-1881.

Research output: Contribution to journalArticle

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