Ultrasonic transducers as a black-box: equivalent circuit synthesis and matching network design

A new modeling technique for ultrasonic transducers is developed in order to build an analytical model in the Laplace s-domain. The model is intended for use in analog circuit CAD system for the front-end electronic design and to visualize the acoustic pulse modifications under different excitation...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1993-11, Vol.40 (6), p.694-703
Main Authors: Capineri, L., Masotti, L., Rinieri, M., Rocchi, S.
Format: Article
Language:English
Subjects:
Acoustic transducers
Analog circuits
Analytical models
Circuit synthesis
Design automation
Equivalent circuits
Impedance
Transfer functions
Ultrasonic transducers
Voltage
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Summary:A new modeling technique for ultrasonic transducers is developed in order to build an analytical model in the Laplace s-domain. The model is intended for use in analog circuit CAD system for the front-end electronic design and to visualize the acoustic pulse modifications under different excitation conditions. The transducer is characterized by two analytical functions representing the driving point impedance and the electroacoustic transfer function. The transfer function is obtained as the ratio of the transducer axial response and the excitation voltage. The reference responses of the impedance and transfer function are derived by the Fourier transform of the measured signals. The model is derived by the measurements of the driving point current and voltage, and the field axial response is sensed by a hydrophone. The procedure for the model identification is described. The results of testing 5-MHz transducer for medical applications are presented. An approach for the design of broadband matching networks using a constant resistance network is reported.< >
ISSN:0885-3010
1525-8955
DOI:10.1109/58.248213