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研究生: 沈明永
Ming-Yong Shan
論文名稱: 溫度無感之布拉格光纖光柵傾斜感測器
Temperature-Independent Fiber Bragg Grating Tilt Sensor
指導教授: 王立康
Li-Karn Wang
口試委員:
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年: 2007
畢業學年度: 95
語文別: 中文
論文頁數: 87
中文關鍵詞: 傾斜光纖光柵感測器
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  • 我們的感測元件在製作方式上,排除了擺垂(而是放置鐵球)、圓棒、剛性盒子等零件的多點黏貼情形;在選用材料上,使用費用較為低廉之水管帽(PVC)充當主體,因此在量測穩定度與經濟上都極具優勢。另外,不同於先前的光纖光柵傾斜感測器研究,除了能獲得傾斜的角度還可藉由反射頻譜中心波長判斷傾斜的方向。
    我們採用摻鉺光纖放大器(EDFA)的輸出光(ASE)作為系統所需的寬頻光源(BBS),光源經由1:99的coupler之後,一部分的光被power meter偵測,另一部分的光通過第一個 3dB coupler時,能量會平均分散(50/50)至兩條光纖路徑,分別傳遞至反射波長較短的布拉格光纖光柵(FBG S)、反射波長較長的布拉格光纖光柵(FBG L),此時,將獲得FBG S、FBG S的反射訊號。最後,我們便能利用optical spectrum analyzer(OSA)、power meter讀取FBG S、FBG L的疊加頻譜功率以及個別頻譜波長,並根據相關理論計算出環境溫度以及傾斜角度的大小。
    本論文利用個別頻譜反射中心波長的變化,於 時量測所得角度,準確度、解析度分別可達 、 ;另外,在溫度的量測上,亦
    可藉由疊加頻譜功率的變化來判讀,其準確度、解析度分別為1.74℃、0.039℃。


    Our feeling measured the part in the manufacture way, removed the pendulum to hang (but is lays aside iron ball), round components and so on stick, rigid box. mounts pastes the situation; In selects on the material, a working costs more inexpensive water pipe(PVC) acts as the main body, therefore all extremely has the superiority in measuring the stability and the economy. Moreover, was different to the formerly optical fiber diffraction grating inclines the sensory element research, except could obtain the angle which inclined also to be possible the affiliation the direction.
    We use mixes the erbium optical fiber amplifier (EDFA) the output light (ASE) to take the system needs wide frequency light source (BBS),light source after 1:99 coupler, part of light are detected by power ,When another part of light through first 3dB coupler, can meet the average to disperse (50/50) to two optical fibers diameters ,separately transmits to the reflection wave length shorter Bragg optical fiber diffraction grating (FBG S), the reflection wave length longer Bragg optical fiber diffraction grating (FBG L), This time, will obtain FBG S, the FBG S echo signal. Finally, we then can using optical spectrum analyzer(OSA),power meter read take FBG S, the FBG L superimposition frequency spectrum power as well as the individual frequency spectrum wave length, and according to correlation theoretical calculation ambient temperature as well as angle of tilt size.
    Present paper use individual frequency spectrum reflection center wavelength change, Surveys the obtained angle at , The accuracy, analysis separately may reach 、 ; Moreover, in temperature survey, Also may the affiliation interpret by the superimposition frequency spectrum power change, The accuracy, analysis separately may reach1.74℃、0.039℃。

    第一章 緒論-----------------------------------1 1.1 研究背景…………………………………………………… 1 1.2 文獻回顧…………………………………………………… 3 1.3 研究目標…………………………………………………… 5 1.4 內容大綱…………………………………………………… 6 第二章 光纖與光纖感測器-----------------------7 2.1 光纖………………………………………………………… 7 2.1.1 光纖的結構……………………………………………… 7 2.1.2 基本光纖光學…………………………………………… 8 2.1.3 光纖種類…………………………………………………12 2.1.4 光纖傳輸損失……………………………………………16 2.2 光纖感測器…………………………………………………19 2.2.1 以感測元件分類……………………………………… 19 2.2.2 以解調方式分類…………………………………………19 2.2.3 不同的光纖感測器………………………………………22 第三章 布拉格光纖光柵------------------------26 3.1 光纖光柵的原理………………………………………… 26 3.2 光纖光柵的分類……………………………………………28 3.2.1 短週期式光纖光柵………………………………………28 3.2.2 長週期式光纖光柵………………………………………30 3.3 光纖光柵的製作……………………………………………32 3.4 布拉格光纖光柵(FBG)的理論分析……………………… 38 3.4.1 布拉格條件(Bragg Condition)……………………… 38 3.4.2 耦合模理論(Coupled Mode Theory)………………… 39 3.5 布拉格光纖光柵感測原理……………………………… 41 3.5.1 波長飄移與應變關係………………………………… 41 3.5.2 波長飄移與溫度的關係…………………………………42 3.5.3 膠固效應影響理論………………………………………43 第四章 實驗架構與量測原理--------------------44 4.1 實驗架構……………………………………………………44 4.2 量測原理………………………………………………… 47 4.3 理論分析……………………………………………………49 4.3.1 頻譜飄移與啁啾(Chirp)現象………………………… 49 4.3.2 疊加頻譜功率與温度的關連……………………………53 4.3.3 實驗架構感測原理…………………………………… 54 第五章 實驗結果與討論------------------------55 5.1 恆溫傾斜實驗………………………………………………55 5.1.1 個別頻譜的反射中心波長…………………………… 55 5.1.2 個別頻譜的功率與3dB頻寬…………………………… 60 5.2 水平變溫實驗………………………………………………63 5.2.1 個別頻譜的反射中心波長………………………………63 5.2.2 疊加頻譜的功率…………………………………………67 5.3 數據分析與實驗誤差的探討………………………………73 5.3.1 實驗數據分析……………………………………………73 5.3.2 實驗誤差的探討……………………………………… 83 第六章 結論--------------------------------------------84 參考資料------------------------------------------------85

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