臺灣博碩士論文加值系統

光纖在通訊之應用早為人所熟知，近幾年更被廣泛應用於量測，光纖體積小，韌性高，抗腐蝕以及抗電磁干擾的特性，非常適合作為感測器量測結構之微小變化。本文主要探討光纖感測器在結構振動之量測應用，結合光彈理論與Mach-Zehnder干涉推導出光相位差與應變關係，應用3x3光耦合器三個輸出端具120 相位差之特性，以數學運算解調Mach-Zehnder兩干涉光路之相位差，再由光相位差求得結構應變。並以懸臂樑為例說明Mach-Zehnder干涉型光纖感測器之量測方法，包含基座激振、強制振動及自由振動三種不同振動模式，頻率的選擇則涵蓋單一頻率、雙頻率、共振與非共振之多種不同組合，並將光纖感測所得振動應變與應變規量測值比較，以驗證量測準確性。

Optical fibers are well known in the applications of communication. Optical fibers possess the advantages such as small size, light weight and immunity to electro-magnetic interference that meet the sensing requirements to a large extent. In this investigation, the Mach-Zehnder interferometric fiber-optic sensor is used to measure the dynamic strain of a vibrating cantilever beam. A 3x3 coupler is utilized to demodulate the phase shift of the Mach-Zehnder interferometry. The dynamic strains of the cantilever beam subjected to free vibration, base excitation and forced vibration are determined by the optic-fiber sensor, The selected frequencies for the vibration test include resonance, non-resonance, single frequency and double frequencies. The experimental results are validated with the strain gauge.

書名頁 ................................................. i
論文口試委員審定書 ..................... ............... ii
授權書 ................................................ iii
中文提要 ........................ ...................... iv
英文提要 .................................................v
誌謝 ....................................................vi
目錄 .................................................. vii
表目錄 ............................................... viii
圖目錄 .................................................. x
一、 緒論 .............................................1
1.1 研究動機 .........................................1
1.2 文獻回顧 .........................................1
1.3 研究方法及內容 ...................................3
二、 干涉型光纖感測器量測原理 .........................4
2.1 光纖感測器 .... ................................. 4
2.1.1 光干涉原理 ...................................... 4
2.1.2 光干涉儀種類 .................................... 5
2.1.3 Mach-Zehnder光纖干涉儀 .......................... 6
2.2 干涉型光纖感測器量測原理 ........................ 6
2.3 應用3x3光耦合器解調光相位差 ..................... 9
2.4 光相位之解調驗證 ............................... 12
三、 懸臂樑基座激振光干涉系統量測實驗 ............... 14
3.1 光纖量測設備與感測光路 ......................... 14
3.1.1 量測設備 ....................................... 14
3.1.2 感測光路 ....................................... 15
3.2 單一頻率基座激振 ............................... 16
3.3 雙頻率基座激振 ................................. 19
3.4 實驗結果分析 ................................... 20
四、 懸臂樑強制振動光干涉系統量測實驗 ............... 22
4.1 單一頻率強制振動 ............................... 22
4.2 雙頻率強制振動 ................................. 23
4.3 實驗結果分析 ................................... 25
五、 懸臂樑自由振動光干涉系統量測實驗 ............... 27
5.1 不同下壓量之自由振動 ........................... 27
5.2 實驗結果分析 ................................... 29
六、 結論 ........................................... 30
參考文獻 ............................................... 33
簡 歷 ...............................................115

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