Characterisation and assessment of an integrated matching layer for air coupled ultrasonic applications

S.P. Kelly, G. Hayward, T.E.G. Alvarez-Arenas

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


A novel ultrasonic matching layer for improving coupling between piezoelectric transducers and an air load is presented and the results of a theoretical and experimental program of work are provided. A combination of a porous material that has very low acoustic impedance with a low-density rubber material forms the basis of the approach. These matching layers were first analyzed experimentally using scanning electron and optical microscopy to determine the microscopic structure. Air-coupled resonance measurements were then performed to reveal the acoustic parameters of the individual layers that were identified within this multilayered structure. These data were then incorporated into a conventional linear model, and this has been verified and used to study performance and produce designs. Close correlation between experiment and theory is demonstrated. The most efficient designs have been implemented in a pitch/catch air-coupled system, and an improvement in received signal amplitude of 30 dB was achieved when compared with the unmatched case.
Original languageEnglish
Pages (from-to)1314-1323
Number of pages9
JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Issue number10
Publication statusPublished - Oct 2004


  • acoustic impedance
  • impedance matching
  • optical microscopy
  • piezoelectric transducers
  • porous materials
  • rubber scanning
  • electron microscopy
  • ultrasonic transducers

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