PVDF transducers-a performance comparison of single-layer and multilayer structures

To improve the pulse-echo sensitivity of a piezopolymer transducer while preserving its broad bandwidth property, several multilayer transducer design approaches have been suggested. This paper presents formulae derived to describe three types of multilayer transducers: a folded multilayer-, Barker-...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1997-09, Vol.44 (5), p.1148-1156
Main Authors: Qian Zhang, Lewin, P.A., Bloomfield, P.E.
Format: Article
Language:English
Subjects:
Analytical models
Bandwidth
Biomedical imaging
Biomedical transducers
Frequency
Image analysis
Image resolution
Medical simulation
Nonhomogeneous media
Signal resolution
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Summary:To improve the pulse-echo sensitivity of a piezopolymer transducer while preserving its broad bandwidth property, several multilayer transducer design approaches have been suggested. This paper presents formulae derived to describe three types of multilayer transducers: a folded multilayer-, Barker-coded, multilayer-, and switchable Barker-coded multilayer transducer. The pulse-echo responses of the multilayer transducers under various excitation signals were calculated and compared with those achievable with an equivalent PZT transducer. Also, the influence of a tissue layer on the transducer responses was examined. The simulation results indicated that the switchable Barker coded transducer design outperforms all other transducer designs analyzed with respect to the axial resolution and overall sensitivity in the medical imaging frequency range. To verify the simulation results, several prototypes of multilayer Barker coded transducers were fabricated and tested in water. A good agreement between the experimental results and the corresponding computer predictions was achieved.
ISSN:0885-3010
1525-8955
DOI:10.1109/58.655640