臺灣博碩士論文加值系統

本研究利用布拉格光纖光柵結合永久性磁鐵與彈簧及螺線圈製作感測器元件，再利用光切換器結合感測器元件製成電流計。將感測器元件上的螺線圈通以電流，此時螺線圈會產生磁場，磁場對磁鐵產生影響並帶動光柵與彈簧，此時光纖光柵會受到軸向的應力，因此光纖光柵的中心波長會產生漂移的情形，藉由觀察中心波長的變化可以得知電流的大小。
本實驗製作的感測器有兩個不同的電流感測範圍，其特性分別為測量範圍±17 A、準確度約0.1 A、靈敏度為0.095nm/A ；另一個測量範圍±3.5 A、準確度約0.03 A、靈敏度為0.28nm/A 。
使用光纖電流計測量電流的好處在於光纖質輕、使用時間較長，而利用本實驗所製作的感測器來測量電流時，不僅僅可以測量較大的電流，同時亦可用來測量較小的電流。

This thesis shows a fiber current sensor based on a fiber Bragg grating, a permanent magnet, a spring and a solenoid. For a wide range measurement of current, an optical switch is used in this sensor. When the testing current passes through the solenoid, a magnetic field is induced in the inside of the solenoid, which will interact with the permanent magnet to create a magnetic force to strain the spring connected with an FBG and then to cause the Bragg wavelength shift. Thus the magnitude of testing current can be obtained from the wavelength shift.
The experiment includes two sensing heads with the sensitivities of 0.095 nm/A and 0.28nm/A respectively. The lower-sensitivity sensing head has the measuring range of ±17 A with the accuracy of 0.1 A. The higher-sensitivity sensing head has the measuring range of ±3.5 A with the accuracy of 0.03 A.
The advantages of using fiber current sensor are light weight, and a longer life time. The proposed fiber current sensor can provide a method for measuring a wide range of electrical current.

致謝.............................i
摘 要...........................iii
Abstract.........................iv
目錄.............................v
圖目錄...........................viii
表目錄...........................x
第一章 緒論.....................1
1.1 前言 ........................1
1.2 研究動機....................2
1.3 本文架構....................3
第二章 基本原理.................4
2.1光纖光柵理論..................4
2.1.1 光纖架構..................4
2.1.2 光纖傳輸原理..............5
2.1.3 光纖傳輸損失.............................6
2.1.4 光纖數值孔徑(Numerical Aperture；NA).....7
2.1.5 光纖模態數( V)...........................7
2.1.6 光纖光柵簡介.............................8
2.1.7光纖光柵的分類.............................9
2.2 布拉格光纖光柵.............................12
2.2.1 布拉格光纖光柵耦合理論...................12
2.2.2 布拉格光纖光柵受應力時的影響.............17
2.2.3 布拉格光纖光柵的優點.....................18
2.3 長週期光纖光柵.............................20
2.3.1 長週期光纖光柵結構.......................20
2.3.2 長週期光纖光柵理論分析...................21
2.3.3 長週期光纖光柵光學特性...................23
2.3.4 長週期光纖光柵的應用.....................26
2.4 布拉格光纖光柵電流計感測器理論.............31
2.4.1 布拉格光纖光柵電流計.....................31
2.4.2 布拉格光纖光柵電流感測頭.................32
2.4.3 布拉格光纖光柵電流計感測原理.............33
第三章 實驗步驟與結果分析......................36
3.1 高壓載氫...................................36
3.2 光纖光柵寫製方法...........................36
3.3 光纖光柵電流計之製作.......................40
3.4 實驗設備...................................41
3.5 實驗結果...................................41
3.6 實驗分析與討論.............................51
第四章 結論....................................57
第五章 未來展望................................58
參考文獻........................................59
作者簡介........................................62

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