2006-01-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665801摘要：由於可快速填充、一般溫度及壓力下的可操作性、甲醇價格低廉、無電解液、及體積輕巧等優點，直接甲醇燃料電池(Direct methanol fuel cell, DMFC)為當今具有高度應用價值的能量來源，而發展成為可攜帶式能源是DMFC的一個重要的應用。由於甲醇燃料濃度與DMFC的性能有直接的關係，本計畫擬開發一微小甲醇濃度超音波感測模組，除了配合小型化DMFC之空間應用外，並可利於對DMFC整體工作的監測與控制。藉由波傳速度與甲醇濃度改變的關係，訂定適當之波傳頻率，針對DMFC設計及製作一微小化之超音波甲醇濃度感測模組。模組將包含微小化換能器、發射/接收控制電路、速度與濃度關係資料庫、及比對程式。<br> Abstract: Due to fast rechargeable, manipulatable at ordinary temperature and pressure, free of electrolyte, compact and lightweight, and low cost of methanol, Direct Methanol Fuel Cell (DMFC) becomes one of the most potential energy sources and portable DMFC is one of the promising applications. Since the performance of the DMFC is directly relevant to the density of methanol solution, this project proposes an idea of design and manufacturing of a miniaturized ultrasonic methanol sensor module. The relationship between acoustic wave velocity and the density of methanol solution will be utilized under a certain propagation frequency. This module will include miniaturized ultrasonic transducers, transmitting/receiving circuits, wave speed-density data charts, and computing program and the size will be compact to fit the limited space of DMFC.直接甲醇燃料電池超音波濃度感測Direct Methanol Fuel Cellultrasonic sensordensity sensor