2007-01-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665802摘要：近來燃料電池技術的快速成長，在新興能源中佔一重要地位，其中又以直接甲醇燃料電池(Direct Methanol Fuel Cell, DMFC)較被看好，應用上由於具有高能量密度的優點，所以也被期待成為下一世代可攜式能源。由於DMFC的發電效率與甲醇燃料濃度有直接關係，為了即時監控燃料濃度的變化，並近一步控制燃料濃度，使DMFC達到最佳之發電效率，本計劃擬開發一微小甲醇濃度超音波感測模組來完成上述目標。而此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、比對程式；基本原理則是利用超音波隨著甲醇燃料溶液的不同濃度而有不同的波傳特性，於此建立此特性與濃度之關係。本計畫上年度截至目前已完成兩組自製之第一代換能器雛形探頭、一組含甲醇流道設計之換能器模組、可控溫之實驗環境、不同溫度/濃度之波傳律定資料庫、及發射/接收雛形電路，本年度將完成微小化之換能器模組、微小化之發射/接收電路、信號處理與顯示電路、及比對程式，最後整合換能器-電路模組。<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. Until now, this project has accomplished two sets of transducer module, one set of transducer module with flow chamber and the wave-speed data bank. In this year, miniaturized transducers, transmitting/receiving circuits, signal processing circuit, and comparison program will be completed.燃料電池直接甲醇燃料電池超音波換能器濃度感測Fuel CellDirect Methanol Fuel CellUltrasonic TransducerDensity Sensor