臺灣博碩士論文加值系統

在本研究中，我們利用了兩段式熔拉製作一個陡變熔拉微光纖干涉儀(Stretched abrupt-tapered micro fiber interferometers, SATMFI)，進行應變的感測以及溫度的特性量測。首先利用電極放電的方式，製作一個陡變熔拉光纖激發出高階纖芯模，再利用氫氣火焰將陡變熔拉光纖做均勻拉伸，使得纖芯模與纖殼模耦合產生干涉。
在實驗上，使用康寧標準單模光纖(Single mode fiber 28,SMF-28)與鉺鐿共摻光纖(Er/Yb codoped fiber, EYDF)來製作感測器並且比較不同的直徑。使用EYDF光纖製作的應變感測器，在直徑為2.8 μm時，干涉消光比可達18 dB，應變靈敏度可達7.71 nm/mɛ。另外我們也選擇SMF-28製作的感測器，在直徑為4.2 μm時應變靈敏度可達3.96 nm/mɛ，並且溫度在30 °C~70 °C時對於溫度不敏感。在本研究中我們提供了一種感測器，具有體積小，製作容易具有經濟效益。未來希望可以應用在房屋建設、機械設備、環境保持、地震預測與生物醫療。

In this study, we made a stretched abrupt-tapered micro fiber interferometers by two-step processing tapered fiber, in order to sense strain and measure temperature characteristics. Firstly, we fabricated an abrupt-tapered fiber by discharging electrode to excite higher order cladding mode and then used hydrogen flame to make abrupt fiber stretched, enabling the fiber core and high order cladding mode to recombine and generate interference.
In this experiment, by using Corning standard single-mode fiber (single mode fiber 28, SMF-28) and Erbium and Ytterbium co-doped fiber (Er/Yb codoped fiber, EYDF), we made sensors to compare results in different diameters. In case of using optic strain sensors made by EYDF fiber, with diameter of 2.8 μm, strain sensitivity reached up to 7.71 nm/mɛ, while using sensors made by SMF-28, with diameter of 4.2 μm, strain sensitivity reached 3.96 nm/mɛ and became temperature-insensitive from 30 to 70 degree Celsius. In this study, we provide a sensor with compact size, easy fabrication and cost efficiency. Hope in the future it will be widely applied in housing construction, machinery and equipment, environmental conservation, earthquake prediction and biomedical engineering.

摘要 I
ABSTRACT III
致謝 V
目錄 VII
圖目錄 IX
第一章 緒論 1
1-1 前言 1
1-2 研究動機 2
1-3 發展歷史 3
1-4 光纖式應變力感測器介紹 4
第二章 陡變熔拉光纖干涉儀 10
2-1 簡介 10
2-2 FMZI干涉原理 11
2-3 主動光纖與被動光纖之比較 15
第三章 實驗架構 17
3-1 陡變熔拉光纖簡介 17
3-2 製作陡變熔拉光纖 17
3-3 使用SATMFI做應變與溫度感測實驗架構 19
第四章 實驗數據與討論 20
4-1 陡變熔拉微光纖干涉儀之特性 20
4-2 SMF-28陡變熔拉微光纖干涉儀應變感測 25
4-3 SMF-28陡變熔拉微光纖干涉儀溫度特性量測 30
4-4 EYDF陡變熔拉微光纖干涉儀應變感測 33
4-5 EYDF陡變熔拉微光纖干涉儀溫度特性量測 35
第五章 結論與未來展望 38
5-1 結論 38
5-2 未來展望 38
參考文獻 40

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