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Acta Mechanica Solida Sinica

, Volume 23, Issue 2, pp 124–134 | Cite as

Acoustical Transmission Line Model for Ultrasonic Transducers for Wide-Bandwidth Application

  • Yeongchin Chen
Article

Abstract

An improved model for ultrasonic transducers is proposed. By considering only the first symmetric mode, each layer is represented as an acoustical transmission line in modeling of bulk wave transducers. In imaging applications, wide bandwidth and short time duration are required. The approach we have used consists of impedance matching the front face of the piezoelectric transducer to the propagating medium with a quarter wavelength impedance matching layer and inserting an unmatching quarter wavelength acoustical layer between the rear face and backing material. A heavy backing would degrade the wide-band phenomena, but show a time duration shorter than 0.5 µs for imaging applications. PSPICE code of the controlled source model is implemented to precisely predict the performance of the matched transducers such as impedance, insertion loss, bandwidth and duration of the impulse response. Good agreement between the simulation and experimental results has been achieved.

Key words

acoustical transmission line ultrasonic transducer wide-bandwidth PSPICE controlled source 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2010

Authors and Affiliations

  1. 1.Department of Computer Science and Information EngineeringAsia UniversityTaichung 41354, TaiwanChina

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