Ultrasonic Transducer as a Black-Box: Equivalent Circuit Synthesis and Matching Network Design
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, ISSN: 0885-3010, Vol: 40, Issue: 6, Page: 694-703
1993
- 25Citations
- 19Captures
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Article Description
In this paper a new modelling 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 considered as a black-box, 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 sensed by a hydrophone. In this work the following procedure for the model identification has been adopted. In the first step an approximation of the model structure, defined by the pole and zero terms, is found by a manual and/or automatic technique. The second step optimizes the model parameters by minimizing a mean-squareerror cost function between the model functions and the reference ones. The results of testing 5-MHz transducer for medical applications are described. Finally, a novel approach for the design of broadband matching networks using a “constant resistance network” is reported. © 1993 IEEE
Bibliographic Details
Institute of Electrical and Electronics Engineers (IEEE)
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