臺灣博碩士論文加值系統

光纖加速規是現今科學與工程系統上量測工具的新應用研究，其最大優點是尺寸小及低成本，且可用於大部分的振動量測。本研究是以研製加速規為主體，並以光纖光柵作為基底，分別量測慣性質量對於加速規靈敏度的影響及正弦波振動頻率的感測實驗。
加速規是現今科學與工程系統上量測工具，其最大優點是尺寸小及低成本，且可用於大部分的振動量測。此研製是以利用兩個相同的光纖光柵作為主要感測元件，並封裝於3D列印機所製作而成的塑膠空心圓柱中，並且在這兩個圓柱間，利用薄膜隔成兩個空間，並將光纖光柵在薄膜上黏貼金屬墊片，當感測器受到振動頻率時，金屬片會因加速度而產生位移，而造成同時拉扯一端之光柵，並同時壓縮另一端光柵，造成中心波長往長或短波長移動，當感測器的光纖光柵波長與匹配光柵所反射的光波長相同時，將會在光功率計上產生電壓，在長短波長的變化中，經由示波器將可觀察到週期性的變化。因此，可運用於應力差所造成的光柵中心波長，來辨識「加速度」或「減速度」運動大小及方向關係，並可運用於相關振動之量測。

In recent years, an accelerometer has been commonly used as a measurement tool in the fields of engineering and science. The biggest advantages of an accelerometer are small size and low cost, and it is used widely in vibration measurement. The main purpose of this study was to investigate the design of an accelerometer with fiber grating. Moreover, the influence of inertial mass on the sensitivity of the accelerometer was examined to reveal how different masses lengthen fiber grating. Also, the frequency of sine wave vibration on the sensing measurement by the accelerometer was experimentally demonstrated.
In this study, the fiber grating was used as the main sensing components, encapsulated in two plastic hallo cylinder made by a 3D printer. A thin film was placed between the cylinders. a metal plate was glued to the film. The fiber grating went through two cylinders and the film. As the sensor detected a vibration frequency, the metal plates moved in response to the acceleration. The motion pulled on one end of the grating while compressing the other end, causing the central wavelength to drift to a long or short wavelength. When the wavelength of the fiber grating in the sensor was the same as the wavelength reflected from the matched grating, voltage was produced via the photodetector. The change of the wavelength displayed a periodic change in the oscilloscope. Thus, the effect of stress difference on the center wavelength shift could identify the magnitude of motion and direction of acceleration or reduction speed. The sensor could have practical application of the vibration measurement

目錄
摘要………………………………………………………………………………………………i
ABSTRACT…………………………………………………………………………………………ii
致謝………………………………………………………………………………………………iii
目錄………………………………………………………………………………………………iv
表目錄……………………………………………………………………………………………vi
圖目錄……………………………………………………………………………………………vii
符號說明…………………………………………………………………………………………xi
第一章 緒論1
1.1 研究動機1
1.2 研究背景 2
1.3 研究目的 10
1.4 論文架構 11
第二章 光纖基礎理論 12
2.1 前言 12
2.2 光纖結構 12
2.3 布拉格光纖光柵 13
2.4 光纖光柵的光敏性 14
2.5 布拉格光纖光柵模態耦合理論分析 14
2.6 光纖光柵寫製技術 18
2.7 布拉格光纖光柵對應力變化的特性 19
第三章 研究方法及步驟 20
3.1 加速規光纖光柵感測器元件製作 20
3.2 慣性質量對於感測器靈敏度之影響 22
3.2.1 實驗設備 22
3.2.2 實驗原理 22
3.2.3 實驗步驟 22
3.3 正弦波振動時對於感測器頻率的感測 25
3.3.1 實驗設備 25
3.3.2 實驗原理 25
第四章 實驗結果分析與討論 29
4.1 慣性質量對於感測器靈敏度之影響 29
4.1.1 當施加重量50g時，FBG反射波長 30
4.1.2 當施加重量100g時，FBG反射波長 30
4.1.3 當施加重量150g時，FBG反射波長 31
4.1.4 當施加重量200g時，FBG反射波長 31
4.1.5 當施加重量250g時，FBG反射波長 32
4.1.6 當施加重量300g時，光纖斷裂 32
4.2 正弦波振動時對於感測器頻率的感測 36
4.2.1 以尺寸A感測器之雙邊光柵，進行10Hz、12Hz、15Hz、18Hz、20Hz、25Hz、30Hz等七種不同頻率量測時的FBG反射波長變化 37
4.2.2 以尺寸B感測器之雙邊光柵進行10Hz、12Hz、15Hz、18Hz、20Hz、25Hz、30Hz等七種不同頻率量測時的FBG反射波長變化 47
4.2.3 小結 56
4.2.4 以尺寸C感測器之雙邊光柵進行10Hz、12Hz、15Hz等三種不同頻率量測時的FBG反射波長變化 57
4.2.5 小結 62
4.2.6 以尺寸A感測器之單邊光柵進行10Hz、12Hz、15Hz、18Hz、20Hz、25Hz、30Hz等七種不同頻率量測時的FBG反射波長變化 63
4.2.7 小結 75
第五章 結論 76
5.1 光纖光柵加速規感測器前置作業錯誤與改進 76
5.2 雙邊光柵及單邊光柵之差異比較 76
第六章 未來展望 77
6.1 光纖光柵加速規的製作改良 77
6.2 薄膜的選擇 77
6.3 縮短感測器元件組裝時間 77
6.4 期許 77
參考文獻 78

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