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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/3260

    Title: 高靈敏奈米級O2 及CO2 光纖氣體感測分析系統之設計(I)
    Design on Nano-scale O2 and CO2 Glass Optical Fiber Gas Sensors with High Sensitivity(I)
    Authors: 于劍平
    Keywords: 光纖式氧氣感測器
    optical fiber oxygen sensors
    sol-gel process, platinum complex
    temperature effect
    Date: 2007-03-29
    Issue Date: 2009-08-13 23:54:08 (UTC+8)
    Abstract: 近年潛艦於國防武力上佔有極重要地位。然而,潛艦艙間空氣成分與濃度,對官兵健康之維護具有重大之影響,如:氧含量不足或二氧化碳等氣體濃度過高等,均會造成人員缺氧傷害,甚至死亡之危險,故須運用空氣分析系統監控人員經常活動部位之空氣品質,使官兵可以維持正常服勤;基於潛艦空間有限考量,設計之系統必須適合使用環境,並具反應靈敏、監控精準、小巧質輕及易於操作維護等性能,本計畫引進先進主流科技,預期研究成果將可符合長期使用目標。本研究利用一簡單、低成本的技術去製作光纖式高靈敏度氧氣感測器,此技術是利用溶膠凝膠(sol-gel)過程(方法)合成出微孔性薄膜材料,並將之塗佈在光纖端面,此時感測材料會被侷限在微孔性薄膜的微米孔洞中,經由UV LED (390 nm)光源的激發而產生放射螢光(650nm or 645nm)。利用量測放射螢光強度的變化去偵測氧氣濃度,因為放射螢光之強度會隨著氧氣濃度不同而改變。而本文使用鉑化合物作為感測材料所製作出的光學式光纖氧氣感測器,其靈敏度分別可達22 與48。並且其反應時間分別為0.6 秒與0.7 秒(激發螢光強度由100%氮氣變化到100%氧氣之所需時間)以及5 秒與14 秒(激發螢光強度由100%氧氣變化到100%氮氣之所需時間)。另外本研究也利用Stern-Volmer model 分析當溫度變化在25 ℃到70 ℃之間時,溫度效應對光纖氧氣感測器之影響。其結果顯示當溫度由25 ℃變化到70 ℃時,其產生的放射螢光強度會遞減56.33%。由以上之實驗結果顯示出本研究所提出的光纖式氧氣感測器具有更高的靈敏度以及更快的反應時間。In the recent year, submarine plays an important role in the national defense force. However,the contents and concentrations of air inside of the submarine greatly affect the health of theofficers and soldiers. When the concentration of oxygen is not enough and carbon dioxide is toohigh, the officers and soldiers will be hurt and even be died. Therefore, it is necessary to use theair analysis system to supervise and control the air quality, and then the officers and soldierswork safely and normally inside the submarine. Based on the limitation of the spaces insubmarine, the design system must maintain the normal performance, suit the environment forutility, respond intelligently, supervise and control precisely, weight light, and easy to operate themaintenance function. This project introduces advanced essential science and technology inoptical fiber sensors, and the results of expectation’s studying can match the long-term usagetarget.A simple, low-cost technique for fabrication of an optical fiber oxygen sensor is described.The technique is based on coating the end of an optical fiber with a microporous film prepared bya sol-gel process. A platinum complex, platinum tetrakis pentrafluoropheny porphine (PtTFPP) orplatinum octaethylporphine (PtOEP), is trapped in the microporous film. In this sensorconfiguration, the complex is excited by the 390 nm radiation and guided by an optical fiber. As aresult, the I0/I100 values of the PtTFPP or PtOEP doped in n-octyltriethoxysilane(Octyl-triEOS)/tetraethylorthosilane (TEOS) composite xerogels are estimated to be 22.3 and47.8, respectively. Also, the typical Stern-Volmer plot shows a very good linearity. The responsetime of the PtTFPP doped in Octyl-triEOS/TEOS composite xerogels is 0.6 s upon switchingfrom nitrogen to oxygen and 5 s from oxygen to nitrogen. In addition, the response time of thePtOEP doped in Octyl-triEOS/TEOS composite xerogels is 0.7 s upon switching from nitrogen tooxygen and 14 s from oxygen to nitrogen. These results indicate that the optical fiber oxygensensors based on the platinum complexes exhibit greater sensitivity, stability and faster responsetime as compared to the existing ones.
    Appears in Collections:[機械工程系所] 研究計畫

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