馬劍清臺灣大學：機械工程學研究所林柏睿Lin, Bo-RueiBo-RueiLin2007-11-282018-06-282007-11-282018-06-282006http://ntur.lib.ntu.edu.tw//handle/246246/61408光纖光柵在應變量測上具有抗電磁性以及高靈敏度的特性，但發展至今在真正動態量測應用上仍然有困難，主要的問題在於光柵訊號解讀的速度與精確度。目前已開發的能量調變型光纖光柵感測器原理是利用布拉格光纖光柵作感測應變，長週期光柵在前端作能量調變，藉此解讀光柵受應力後波長的改變。此架構量測較大振動時非常理想，但在量測微小的動態波傳時由於能量過低的問題，便無法解讀光纖光柵受激振而產生的改變，本論文將嘗試利用一般短週期布拉格光纖光柵與傾斜式光纖光柵替代長週期光柵作能量調變，並且測量微小的振動，將量測範圍從微米級再往下探伸至奈米級。同時本論文探討感測光纖經氫氟酸經蝕刻過後，搭配新開發的能量調變系統，探討面內與面外運動耦合效應的問題，並與雷射都普勒振動儀的量測結果作比較，作穩態振動及暫態波傳的研究。In the measurement of strain field and temperature variation, fiber grating sensor detection technique has been widely used. It has many advantages, such as high sensitivity, low insertion loss, electromagnetic immunity and potentially low cost. The characteristics of fiber grating sensor in sensing static and low frequency response have been frequently reported in the literature. However, in the capability of sensing dynamic response for fiber grating sensor may need for further investigations. The main objective of this thesis is to establish the experimental measurement system based on the grating based fiber sensors to obtain the dynamic transient response of structures subjected to dynamic impact loadings. In this thesis, the tilted fiber Bragg grating (TFBG) and normal fiber Bragg grating (FBG) are proposed as new filter to increase the sensitivity of the fiber grating sensor measuring system. We also provide a new gluing method, it can be used to perform the measurement of out-of-plane motion . The fiber grating sensing-system is used as a displacement sensor and measurement sensitivity is in the order of submicrometer. The etched fiber grating sensor is developed to analyze the in-plane and out-plane coupling effect in transient wave propagation. All the transient responses are simutaneously measured by Laser Doppler vibrometer (LDV), and the results are in excellent agreement with that obtained by fiber grating sensing system.目錄 致謝I 中文摘要II 英文摘要III 目錄V 圖目錄VIII 第一章 緒論 1-1 研究動機1 1-2 文獻回顧4 1-3 內容簡介7 第二章 光纖光柵基本原理與儀器介紹 2-1 基本光纖光學10 2-2 光纖光柵的基本原理13 2-2-1 光纖光柵的分類14 2-3 光纖光柵的製作16 2-4 光彈原理與熱光效應19 2-4-1 光彈原理19 2-4-2 熱光效應22 2-5 共振波長飄移理論23 2-5-1 共振波長理論23 2-5-2 受平面應力下之情況25 2-6 雷射都普勒振動儀27 第三章 傾斜式光柵的原理與製作及特性探討 3-1 傾斜式光柵基本原理34 3-2 拍製傾斜式光柵所使用之儀器介紹49 3-2-1 精密控制旋轉台49 3-2-2 準分子雷射51 3-3 傾斜式光柵的拍製52 3-4 傾斜式光柵之拉伸測試55 3-5 傾斜式濾波光纖光柵之製作56 第四章 量測光路系統與穩態振動實驗 4-1 光纖量測光路系統介紹69 4-2 量測系統之介紹70 4-2-1 8051單晶片電路70 4-2-2 光纖動態量測系統72 4-3 穩態實驗量測與結果探討73 4-4 氫氟酸蝕刻光纖之製造過程77 4-5 利用氫氟酸蝕刻光纖光柵作穩態實驗之結果與討論77 第五章 懸臂樑動態量測實驗 5-1 懸臂樑於暫態波傳產生之模態理論解91 5-2 懸臂樑動態量測系統之架設93 5-3 懸臂樑動態量測實驗結果與討論94 5-4 懸臂樑動態量測實驗結果於頻率域下之探討96 第六章 塊材暫態波傳實驗 6-1 圓形厚鋁塊之暫態波傳114 6-1-1 量測圓形厚鋁塊波傳之實驗架設114 6-1-2 量測圓形厚鋁塊應力波傳結果與討論115 6-2 方形厚鋁塊之暫態波傳118 6-2-1 量測方形厚鋁塊波傳之實驗架設118 6-2-2 量測方形厚鋁塊應力波傳結果與討論118 6-2 方形薄鋁塊之應力波傳119 6-3-1 量測方形薄塊波傳之實驗架設119 6-3-2 量測方形薄鋁塊應力波傳結果與討論119 6-4 蝕刻過之光纖光柵應用於塊材撞擊試驗的應用121 6-5 塊材撞擊試驗在頻率域下之特性探討123 第七章 結論與未來展望155 參考文獻15714247412 bytesapplication/pdfen-US傾斜式光纖光柵短週期光纖光柵能量調變雷射都普勒振動儀穩態振動暫態波傳Tilted fiber Bragg gratingFiber Bragg gratingLDVEtched fiber grating sensorTransient responsesthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/61408/1/ntu-95-R93522505-1.pdf