Analysis of Ultrasonic Transducer Matching Layer

• Main Authors: Guan-Yu Lin, 林冠宇
• Other Authors: Chia-Chi Sung
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/20115008474344750030

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 102 === 　The aim of this paper is to explore the sensitivity of ultrasonic transducer front matching layer using the piezoelectric wave equation and mason equivalent circuit as design conceptions. First, we introduce the structure of the ultrasonic piezoelectric transducer and the factors that impact the performance of the transducer. Through the wave equation, the impedance matrix of piezoelectric transducer is derived. In reproduction order to simplify the complex boundary condition on impedance matrix, using the concept of the acoustic energy transmitted to analyze the internal structure of the transducer. Then, the transfer matrix of transducer is derived. It can simulate acoustic signal transmission matrix transducer which are transferred by layers of the structure inner and outer to affect transducer transfer function. So, we can regard the transfer function as the sensitivity of transducer. 　This study found the tendency in different thickness of matching layer on impact of transfer function through the simulation. Using the pulse-echo system to measure the sensitivity of each transducer, and also find their tendency. The result shows the tendency of simulation is similar to experiment, but the peak value of sensitivity is not match. Also trying to improve the process to reproduce the different thickness of transducers and compare with each tendency. Finally, both are match.