臺灣博碩士論文加值系統

螢光原理被廣泛的應用在化學及生物的特性和分子量級的偵測上。近年來在食品上出現大量黑心產品，其中包括食物漂白劑的濫用，嚴重危害人體健康。基於此原因，我們利用螢光的特性作為感測基礎，並且開發一個以光纖為感測架構針對過氧化氫(雙氧水)濃度的感測器。
在我們的實驗中利用研磨技術在多模態光纖(600μm)上研磨一個平拋面，並且在光纖研磨端面，鍍上一層鋁薄膜作為反射式的結構，目的是減少螢光訊號的損失。再搭配sol-gel技術調配螢光溶膠。最後利用旋轉塗佈機將螢光溶膠塗佈在平拋面上完成了感測器，在激發光源上我們採用高強度的近紫外光LED燈(波長為420nm)，不同以往的雷射光源，以簡單便利便可達到不錯的效果。在此實驗中，我們利用螢光對溫度的特異性，設計了一個溫度感測器。其量測範圍在4℃到100℃有很好的穩定性。我們也利用化學反應原理設計了一個過氧化氫(雙氧水)的濃度感測器可以區分3% 到35%濃度。在未來的工作中，除了改善感測器的靈敏度外，我們也將更近一步的以量測生物樣本為目標。

The theory of fluorescence is broadly applied to the chemical detection and the biomedical engineering. In recent years, in Taiwan, many people use hydrogen peroxide (H2O2) as bleacher in the food treatment in order to make the appearance of the food better. However, it is harmful to health of the consumer that most over-the-counter peroxide solutions are ingested, so we develop a fiber-based fluorescence sensor to detect the concentration of hydrogen peroxide using the property of fluorescence.
In this study, we have to polish the side surface of an optical fiber (multi-mode) and utilized the evaporation Coater to coat a metal thin film(Al) on the fiber end faucet and then prepare to coat the fluorescent sol-gel on the polished surface. After the BPEA film is coated, a near-UV LED is applied to excite the BPEA film and an OSA is used to monitor the peak of fluorescence spectrum. Finally, we will carry out the experiments for the temperature measurement and different concentrations of H2O2 solutions detection.
In the results that the fluorescence intensity of the sensor in temperature measurement is a function of the temperature with the linear response region is about from 4℃ to 100℃ and the thermal hysteresisratio is about 2.77％. In the measurement of concentration of hydrogen peroxide, the fluorescence emission increases versus the concentration of hydrogen peroxide increases.
In the future work, we will reform the technology of BPEA so-gel or fabricate the second structure on the polished surface to improve the sensitivity of temperature sensor and the concentration of hydrogen peroxide sensor better.

CONTENTS
CONTENTSACKNOWLEDGEMENTS i
ENGLISHABSTRACT ii
CHINESE ABSTRACT iV
CONTENTS V

CHAPTER
I INTRODUCTION 1
II THEORY 7
2.1 Introduction 7
2.2 Theory of Jabloski energy diagram 7
2.3 Theory of side-polished fiber 14
2.4 Theory of sol-gel technology 18
III FABRICATION AND EXPERIMENTS 25
3.1 Introduction 25
3.2 Fabrication of the sensor 26
3.2.1. The fabrication of the side-polished fiber 28
3.2.2. The fabrication of reflecting mirror on the end faucet of fiber 33
3.3 Fluorophore so-gel preparation 34
3.4 Experiments 37
3.4.1. Measurement of temperature 37
3.4.2. Measurements of concentration of hydrogen peroxide solutions 40
IV RESULTS AND DISCUSSION 42
4.1 Introduction 42
4.2 Properties of the side-polished fiber 42
4.3 The fiber optic temperature sensor application 50
4.4 The concentration detection of hydrogen peroxide solutions 58
V Conclusion and Future Work 65
Reference 67

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