臺灣博碩士論文加值系統

本論文研究長週期光纖光柵和菲涅耳光纖式折射率計等兩種光纖式折射率量測方法，比較其對於折射率量測的方便性與準確度。首先，以電弧放電法製作長週期光纖光柵，利用共振波長隨折射率變化的飄移特性，研究光柵長度和週期的影響，並比較穿透式與反射式光纖光柵對折射率量測的差異。其次，利用菲涅耳反射原理，研究光纖式折射率計，並利用折射率變化和濃度變化的線性關係，研製測量溶液的濃度計。最後我們利用光纖光柵對外界折射率改變，共振波長隨之飄移的特性，研製水位計。

In this thesis, refractive index measurement with two different methods, long-period gratings (LPG) and Fresnel refractometer, is presented. First, LPG was fabricated by using arc-induced technique and the influence of grating length and period to refractive index sensing of LPG was studied. Comparison of sensing sensitivities between transmission-type LPG and that of reflective-type LPG refractometers were also presented. Secondly, a fiber refractometer with a fiber tip utilizing the Fresnel reflection scheme to measure the refractive index is investigated. Since the concentration change is linearly proportional to the refractive index change, the concentration of solution can be determined from the measured refractive index. Finally, the feasibility of measuring liquid lever using the cascade LPG structure is demonstrated.

目錄
摘要…………………………………………………………………….....I
Abstract……………………………………………………………...…...II
目錄……………………………………………………………………..III
圖目錄………………………………………………………………….VII
表目錄………………………………………………………………...XIV
第一章 緒論…………………………………………………...1
1-1 研究背景………………………………………………………..1
1-1-1 光纖光柵簡介……………………………………………1
1-2 研究動機與目的………………………………………………..1
1-3 本文簡介………………………………………………………..2
第二章 光纖及光纖光柵基本原理………………...……………...3
2-1 光纖基本原理介紹……………………………………………..3
2-1-1 光纖簡介…………………………………………………3
2-1-2 傳統光纖的基本構造……………………………………3
2-1-3 光在光纖中傳播的原理…………………………………4
2-1-4 光纖中的重要參數………………………………………6
2-2 光纖光柵原理…………………………………………………..7
2-3 長週期光纖光柵……………………………………………..15
2-4 模態耦合理論…………………………………………………16
2-5不同折射率下，波長的飄移理論…….………………………18
2-6菲涅耳反射定理……………………………………………..…27
2-6-1 光纖式菲涅耳折射率計…………………………….…28
第三章 長週期光纖光柵製作與應用………………………...…31
3-1 引言……………………………………………………………31
3-2 長週期光纖光柵的製作技術…………………………………31
3-2-1 光罩法…………………………………………………..31
3-2-2二氧化碳雷射寫入法………………….………………..32
3-2-3 電弧放電法……………………………………………..32
3-3 實驗裝置與實驗流程…………………………………………33
3-3-1 實驗流程………………………………………………..39
3-3-2 實驗裝置圖……………………………………………..39
3-3-3 量測折射率實驗裝置…………………………......……40
3-3-4 量測反射式光柵折射率實驗裝置……………...…...…41
3-3-5 串聯式光柵水位計…………….……...………...…..….42
3-3-6 光纖Fresnel式折射儀……….……...………...…..……43
第四章 實驗結果與討論………………………………………..…44
4-1 引言……………………………………………………………44
4-2 製作長週期光纖光柵…………………………………………47
4-3穿透式光纖光柵測量折射率………………………….………50
4-4鍍金反射式光纖光柵測量折射率……………….……………60
4-5光纖式菲涅爾測量折射率…………………….………………80
4-6光纖式水位計………………………………………….………86
第五章 結論與未來展望………………………………………......89
5-1 結論…………………………………………………………....89
5-2 未來展望…………………………………………………...….90
參考文獻…………………………………………………..…..91

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