臺灣博碩士論文加值系統

本研究中分別利用兩種方式提高漸逝波光譜法的乙炔吸收訊號。其中一項使用更細的拉細光纖(本實驗所使用拉細光纖直徑估計最低為600 nm)，另外一個是使用光學外差光譜法。根據理論，我們預期這兩項技術可以有效的提高訊噪比。我們也成功的觀察到隨著調制頻率越高和直徑越細的拉細光纖，乙炔吸收訊號的訊噪比會變更好。為了做高靈敏度氣體感測器，在乙炔氣壓1 Torr下，我們利用直徑不同粗細的拉細光纖，成功的觀察到越細的拉細光纖所測的乙炔單趟吸收訊號越大而且訊噪比越好。
利用拉細光纖亦成功觀察到乙炔飽和吸收。為了能清楚看見乙炔飽和吸收，我們更進一步的使用石英音叉做調制轉移法，在乙炔氣壓700 mTorr下觀察到類似無都卜勒背景的乙炔飽和吸收。

This study used two ways to observe acetylene absorption signal with evanescent wave spectroscopy. One uses 600 nm diameter of fiber taper, the other uses FM heterodyne spectroscopy. According to the theory, we expect two ways can increase SNR of acetylene absorption signal effectively. And then, we observed acetylene absorption signal getting better successfully when we used higher modulation frequency and thinner fiber taper. In order to make a high sensitivity gas sensor, we used different diameter of fiber taper to observe acetylene absorption signal, and we found that acetylene absorption signal better than when we use thinner fiber taper at pressure lower than 1 Torr acetylene.
This work also observed saturated absorption signal with fiber taper successfully too. In order to observe saturated absorption signal clearly, we used tuning fork to carry out the modulation transfer technique, and we observed similar saturated absorption signal without Doppler broadening background at pressure lower than 700 mTorr acetylene.

目錄
第一章 序論 1
1.1 前言 1
1.2 研究動機與目的 3
1.3 乙炔光譜簡介 4
第二章 原理 9
2.1 漸逝波(EVANESCENT WAVE)原理 9
2.2 光纖拉細產生的效應 10
2.3 BEER - LAMBERT LAW 12
2.4 頻率調制 13
2.5 光學外差光譜法 (FM HETERODYNE SPECTROSCOPY) 16
2.6 飽和吸收光譜 18
2.6.1 燒洞效應(HOLE BURNING) 18
2.6.2 蘭姆凹陷(LAMP DIP) 20
2.7 調制轉移光譜法 22
第三章 實驗架構 25
3.1 光學外差光譜法架構 25
3.2降頻光學外差光譜法架構 26
3.3 飽和吸收光譜法架構 27
3.4 石英音叉頻率量測 28
3.5 石英音叉調制雷射架構 30
3.6調制轉移光譜法架構 31
第四章 實證結果與分析 33
4.1 雷射特性量測 33
4.2 漸逝波光譜量測 34
4.3 拉細光纖粗細與漸逝波 35
4.4 高頻率調制 38
4.5 飽和吸收光譜法 41
4.6 石英音叉頻率量測 43
4.7 石英音叉調制雷射 44
4.8調制轉移光譜法 48
第五章 結論與未來展望 50
5.1 實驗結果與討論 50
5.2未來展望 51
參考文獻 53

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