結構振動一直是產業界非常關注的焦點，傳統上大多以加速規作為監測振動的主要感測裝置，而隨著機構的複雜化、精緻化、小型化及輕量化，傳統的加速規受到負載效應的限制，其精確度已無法適應新一代量測條件的要求，因此，光纖振動感測器的研究，乃應運而生。
布拉格光纖光柵的反射波長，對應變和溫度變化有敏感的特性，本研究即利用此特性，以布拉格光纖光柵為感測頭，來量測振動。因為物體的振動會使得布拉格光纖光柵產生的應變，再結合干涉儀及布拉格光纖光柵來做為感測的架構，利用行經不同路徑的兩道光，因受振動源調變，造成兩道光的相位差，再經由解調電路，解出因振動訊號所造成的相位差，進而求得振動信號。相較於傳統加速規，其優點為易於實際的佈放，並且為全光路設計，對低頻振動頻率量測將較為準確。
本論文將初步設計之兩種型式之光纖感測振動器，其為型式1：彎曲損失（Bending Loss）振動感測器；及型式2：布拉格光纖光柵（FBG）振動感測器，並配合干涉儀，分別予以試驗，其結果敘述如下：採用型式1：彎曲損失（Bending Loss）振動感測器，由試驗結果可知，動態範圍在50 dB左右。型式2：布拉格光纖光柵（FBG）振動感測器，經模擬試驗結果，其頻率在100 ~ 400 Hz，其動態範圍為38 dB，最小可測信號為1.95 × 10-2 rad。

Structural born vibration is the most concern issue for industry. Traditionally, the accelerometer is usually used as the major monitoring device for vibration. As the mechanism getting more and more complexity, more compact, tinier and more lighting, the traditional accelerometers are suffered from the loading effect. Its accuracy of measurement is suspected and cannot match the modern measurement requirement. Hence, the studies of fiber optic vibration sensors become an urgent issue in this era.
The reflection wavelength of a fiber Bragg grating（FBG）is sensitive to the variation of the strain and temperature. Our sensor configuration is made of an interferometer and fiber Bragg grating. The vibration induces a strain of the fiber Bragg grating, and it makes a phase difference between those two light beams in the interferometer. A demodulation circuit is needed to detect the phase difference caused by the vibration. In this project, the aim is focused on the vibration measurement for some complicated rotational machines or structures. A fiber optic accelerometer will be designed and studied as a vibration monitor for the other subprojects.
In this the thesis, two kinds of vibration sensor head are designed and studied, the first is a bending loss sensor head and the other is an optic fiber Bragg grating sensor head. The results are narrated as follows：（1） The dynamic range of the bending loss sensing head is about 50 dB.（2）The dynamic range of the optic fiber Bragg grating sensing head is 38 dB with test frequency range between 100 ~ 400 Hz, the noise level is around 1.95 × 10-2 rad.

中文摘要 i
Abstract ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
符號表 xi
第一章 簡介 1
1.1.前言 1
1.2.文獻回顧 2
1.3.研究動機 4
1.4.論文結構 5
第二章 原理 6
2.1.感測器之設計 6
2.1.1.彎曲損失感測器 6
2.1.2.FBG 感測器機構設計 9
2.2.振動基本原理 13
2.2.1.振動感測器 13
2.2.2.橋樑結構振動之分析 18
第三章 光纖感測系統 21
3.1.構成（組成及元件） 21
3.1.1.光路構型 21
3.2.光路偏振分析 25
3.3.數學分析 32
3.4.信號處理系統 34
第四章 實驗結果與討論 37
4.1實驗分類 37
4.2試驗規劃與量測結果 38
4.2.1.試驗#1光纖彎曲損失量測 38
4.2.2.試驗#2彎曲損失感測器靜態載重試驗 40
4.2.3.試驗#3彎曲損失感測器動態載重試驗 44
4.2.4.試驗#4 FBG光纖光柵測試 47
4.2.5.試驗#5 FBG Mach-Zehnder干涉儀光路測試 48
4.2.6.試驗#6 FBG桑克干涉儀光路測試 49
4.2.7.試驗#7平板型PZT模擬振動源的量測 51

第五章 結論 62
參考文獻 63
附表 66
附圖 77
附錄 127
中英對照表 139

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