Characteristics of Multilayer Ultrasonic Piezoelectric Transducers with an Inversion Layer
Date Issued
2007
Date
2007
Author(s)
Hung, Hao-Hsiang
DOI
zh-TW
Abstract
Recently, ultrasonic piezoelectric transducer with an inversion layer has been gaining interest in the development of broadband transducer. In this research we present an analytical model for the analysis of double-layer ultrasonic piezoelectric transducers with an inversion layer. We also analyzed electric input impedance and efficiency of transducers by transfer matrix method.
The design of transducers including single and double-layer piezoelectric films with an inversion layer, backing material, and matching layer is presented. Effects of inversion layer ratio and characteristic impedance of backing material on the performace are studied. Whether transducer bandwidth and efficiency have matching layers or not we make sure of those effects.
Finally, numerical calculations of multilayer ultrasonic piezoelectric transducers by transfer matrix method is examined to understand the characteristics of the transducers working in dual-frequency operation mode, which has been used in harmonic image or broadband characteristic of most ultrasonic applications.
Subjects
反向層
超音波壓電換能
頻寬
效率
轉移矩陣法
inversion layer
ultrasonic piezoelectric transducer
bandwidth
efficiency
transfer matrix method
Type
thesis
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