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Ultrasound transducer models for piezoelectric polymer films

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2 Author(s)
Brown, L.F. ; Dept. of Biomed. Eng. & Electr. Eng., Iowa State Univ., Ames, IA, USA ; Carlson, D.L.

A method is presented for determining the piezoelectric constants and the frequency-dependent dielectric properties of the polymers from a five-step algorithm based on analysis of air-loaded broadband impedance measurements. It is shown how to account for the frequency-dependent lossy properties of these films in an equivalent impedance circuit model and a modified Mason's model. Comparisons between the models and actual film transducers show excellent broadband simulation of both electrical input impedance and ultrasonic pulse-echo performance.<>

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:36 ,  Issue: 3 )