臺灣博碩士論文加值系統

由於光纖光柵的發明，使得光纖感測器在設計上有了更大的運用空間。因為光纖光柵本身是一種直接在光纖上曝光所製作出來的被動元件，所以，可以設計出「全光纖」的感測器，不但具有光纖的一切優點，而且靈敏度高。
最近，光纖光柵已經成為光纖感測領域的重要光學元件。而布拉格式光纖光柵更是焦點的所在，它可以藉由偵測反射的布拉格波長的移動，來決定不同的物理量，例如：溫度、應力、電場、磁場等等的變化。
由於布拉格式光纖光柵(Fiber Bragg grating)擁有在溫度的改變下，反射的布拉格波長會隨之改變的特性，所以在做成一個感測器時，如何分開溫度跟溫度以外的待測物理量對布拉格光纖光柵的影響是必要的。例如，我們想要檢測某環境中的磁場時，若置入布拉格式的光纖光柵當感測器，利用光譜分析儀(optical spectrum analyzer)檢測布拉格波長在頻譜上的變化，溫度跟磁場對光柵的影響將使我們無法確定所受磁場的大小。所以本論文的研究動機就是希望能夠達成區別溫度以及磁場對布拉格光纖光柵所造成的效應。
在本篇論文的研究當中，我們提出了一個溫度無感的布拉格光纖光柵磁場感測器系統，它是以一種奇特的光功率偵測機制為基礎。系統是由一對在布拉格波長反射頻譜上位置幾乎一樣的布拉格光纖光柵所組成，並且把這兩個光纖光柵放置在同一個位置，除此之外，其中一個光纖光柵用AB膠黏貼在磁滯伸縮金屬棒的兩端，另外一個布拉格光纖光柵則黏貼在另外一根作為溫度補償而且不受磁場影響的金屬棒，以此，形成了系統中溫度無感的磁場感測單元。和傳統的布拉格波長解調機制不同的是，我們可以藉由偵測系統中光功率的變化來得知外界磁場的多寡。以下是實驗所得的結果：在磁場變化範圍從0mT到132mT間，感測的線性誤差在(±0.2 %),對磁場的靈敏度為1mT，在溫度從 27℃變化到85℃的時候，所測得的系統溫度穩定度為±0.3 %。

In this study, we propose a temperature-independent fiber-Bragg-grating magnetic field sensing system, based on a novel optical power detection scheme. Implemented with two spectrally slightly separated fiber Bragg gratings, which were closely placed side by side, except for this, one is stuck on the magnetostrictive rod with epoxy at both ends, and the other is stuck on another metal rod which can't be affected by magnetic field to form a temperature-independent magnetic field sensor unit. Instead of conventional wavelength interrogation techniques, magnetic field can be simply calibrated by monitoring the reflected power of the system. Magnetic field measurement up to 132mT with high linearity (±0.2 %), good sensitivity (1mT ), and high thermal stability (±0.3 %) in the temperature range from 27℃~85℃ was achieved here.

第一章 緒論…………………………………………………………3
第二章 光纖感測器的原理………………………………………6
第三章 布拉格光纖光柵的性質及應用……………………….16
3.1光纖光柵的製作…………………………………………16
3.2布拉格光纖光柵的理論分析……………………………21
3.3布拉格光纖光柵的感測原理……………………………25
第四章 用磁場來調制布拉格波長的移動……………………49
4.1磁力所造成的布拉格波長移動…………………………49
4.2磁滯效應…………………………………………………51
第五章 實驗架構與系統量測原理……………………………58
5.1磁場的感測………………………………………………58
5.2溫度的補償………………………………………………59
第六章 數據分析的方法…………………………………………64
6.1 線性誤差……………………………………………64
6.2靈敏度……………………………………………………66
6.3溫度穩定度………………………………………………67
第七章 實驗結果與討論…………………………………………69
7.1實驗結果…………………………………………………69
7.2 討論…..…………………………………………………72
第八章 結論………………………………………………………98
參考文獻……………………………………………………………99

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