Modeling and optimization of high-frequency ultrasound transducers

摘要

Obtaining an accurate transducer model for a high-frequencyntransducer can be troublesome using traditional models, such as the KLMnmodel, since it is often difficult to measure precisely thenpiezoelectric, dielectric, and mechanical properties of the transducer.nThis paper describes an alternative method of modeling transducers usingnnetwork theory. The network theory model for a transducer is determinednfrom a measurement of the transducer impedance in water and thenpulse-echo response of the system for a given electrical source andnload. A discussion of how this model can be used to optimize the designnof an electrical matching circuit is given. This method is illustratednby designing a two-element transmission line matching circuit for anminiature 53 MHz transducer. Excellent agreement between the networknmodel prediction and the experimental response is obtained