The Electromechanical Theory of Piezoelectric Ultrasonic Energy Transmitter

• Main Authors: Po-Lin Liao, 廖伯霖
• Other Authors: 張培仁
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/67167552922870966643

碩士 === 臺灣大學 === 應用力學研究所 === 98 === According to the integration of biosensing system and micro-electro-mechanical systems (MEMS), the size of bio-chip and bio-sensor has been decreased enough to implant into human body. The implanted real-time medical monitoring can be achieved. However, for long term medical care, the power source of implanted chip has been an important issue. This study fuscous on building a piezoelectric acoustic power transmission model which can increase the power gain power transmission system. In addition, adding acoustic matching layers can improve the performance. Utilizing the piezoelectric effect, the acoustic wave provides a feasible way to wirelessly charge the battery of the implanted biochip. The lead-zirconate-titanate (PZT) is used to be the material of transmitter/receiver. Based on the results of the modified matching model, the double impedance matching layers are constructed by the aluminum alloy (6061T6) and polymethylmethacrylate (PMMA or Acrylic). The maximum power gain has been increased from -12.4dB into -6.9dB in simulation and from -12.4dB into -9.3dB in experiment result.