Ms. Valeria Monteiro Nascimento Profile

Valeria Monteiro Nascimento

at Univ of Campinas

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Proceedings Article | 23 May 2003 Paper

Influence of backing and matching layers in ultrasound transducer performance

Valeria do Nascimento, Vera Nantes Button, Joaquim Maia, Eduardo Costa, Eduardo Oliveira

Proceedings Volume 5035, (2003) https://doi.org/10.1117/12.479924

KEYWORDS: Transducers, Epoxies, Ultrasonography, Tungsten, Ceramics, Distance measurement, Acoustics, Ferroelectric polymers, Inductance, Transmitters

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In this work we have investigated the influence of the backing layer composition and the matching layer thickness in the performance of ultrasound transducers constructed with piezoelectric ceramic disks. We have constructed transducers with backing layers of different compositions, using mixtures of epoxy with alumina powder and/or Tungsten powder and with λ/4 or 3λ/4 thickness epoxy matching layers. The evaluation tests were performed in pulse-echo mode, with a flat target, and in transmission/reception mode, with a calibrated PVDF hydrophone. The acoustical field emitted by each transducer was mapped in order to measure the on-axis and transverse field profiles, the aperture size and the beam spreading. The bandwidths of the transducers were determined in pulse-echo mode. Comparing the evaluation tests results of two transducers constructed with the same backing layer, the one constructed with λ/4 thickness epoxy matching layer showed better performance. The results showed that the transducers constructed with epoxy, alumina and Tungsten powders backing layers have larger bandwidth. The larger depth of field was measured for transducers constructed with epoxy and Tungsten powder backing layers. These transducers and those constructed with epoxy, Tungsten and alumina powders backing layers showed the larger field intensities in the measured transverse profiles.

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