- 學位論文
表面聲波感測系統針對氣爆氣體辨識研究
Surface acoustic wave sensing system for explosive gas recognition
摘要
表面聲波元件（SAW Device）使用於氣體感測對於目前家庭環境監測、工業環境安全監控、食品品質鑑定與人身健康管控等，都有著其重要的應用。其元件具有高靈敏度、可靠度高、體積輕巧與成本低等優點，故可以在感測領域佔據著重要的地位，並被廣泛地使用於感測相關領域裡。 本文討論了表面聲波（SAW）感測器對不同有機氣體辨識。為了實現有機易揮發具燃性氣體的即時識別，本論文實現一表面聲波氣相層析（GC/SAW）感測平臺，設計出433Mhz震盪電路配合表面聲波元件，並在不同管柱溫度下進行不同濃度之氣體實驗。 於量測實驗結果之後，進行資料分析，為進一步探究桌上型層析系統對感測氣體靈敏度與層析管柱溫度對氣體感測之影響。 實驗規劃以三種不同氣體分成三種濃度進行不同管柱溫度下之感測研究，使用氣體為甲醇、乙醇與乙醚，從實驗結果得到運用本論文建構之表面聲波感測器在使用氣相層析系統感測三種待測氣體，於不同的實驗設定溫度下對於GC內之靜相物有著不同程度的表現，此外隨著溫度的提升將會降低頻率飄移的感測度，管柱的溫度越高則感測的頻率飄移的下降越顯著。
並列摘要
Surface acoustic wave (SAW) device has been applied as an important sensor in home environment monitor, industrial environment safety monitor, food quality identification and personal health control. Moreover, quartz surface acoustic wave device has many advantages such as: high sensitivity, high reliability, small module size and low cost. Because the surface acoustic wave devices are very sensitive and compact in size, they have been widely used in many sensing applications. For rapidly sensing different organic vapors, in the paper, we develop a compact gas chromatographic (GC) system, using the surface acoustic wave device with 433Mhz oscillattion to realize a GC/SAW system. Our goal is to characterize the sensitivity and the temperature dependence upon sensing organic vapors. In the experiment, three organic vapor including methanol, ethanol and ether are used as the test samples. The results show that sensing performance is influenced by the temperature of GC column since the temperature of column impacts its internal affinity between stationary phase and organic vapors. In addition, the sensitivity degrades in case the temperature of column rises.