Analysis of Multi-Matching Layers of Ultrasonic Piezoelectric Transducer
Date Issued
2005
Date
2005
Author(s)
Chu, Ya-Wen
DOI
zh-TW
Abstract
In recent years, the study of ultrasonic waves has found indispensable applications in the real world. In this thesis, we present the acoustic impedance matching result of the piezoelectric thin plate and the propagation medium when we increase the number of matching layers.
To begin, we introduce the theory of piezoelectricity and explain the structure of the ultrasonic piezoelectric transducer. By extending the theory of transmission line, we find the impedances of the matching layer and find the impedances of each layer in conjunction with the maximally flat-top response. Finally, we conclude that the addition of the matching layers results in the widening of the transmission frequency for the piezoelectric transducer.
An impedance matrix for the piezoelectric transducer can be derived from the piezoelectric wave equation which is called as the transmission matrix method. Using the transmission matrix method we obtain the mechanical and electric impedances of frequency response for the ultrasonic piezoelectric transducer. At the end of this paper, we show the simulation results of the multilayer matching structure of the piezoelectric transducer which can be helpful for designing the ultrasonic piezoelectric transducer.
Subjects
超音波壓電換能器
匹配層
聲阻抗
傳輸線
最平坦化頻率響應
阻抗矩陣
傳輸矩陣法
Ultrasonic Piezoelectric Transducer
Matching Layer
Acoustic Impedance
Transmission Line
Maximally Flat-Top Response
Impedance Matrix
Transmission Matrix Method
Type
thesis
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