光纖布拉格柵會反射特定波長的源 ，其反射的波長與光柵間寬度有關 ，透過對光 柵施以應變及溫度化，會改其光的寬進而布拉格反射波長。通常製作一個以光纖布拉格柵為主的感測器，需要干涉儀 或者是光譜儀 去解調光所反射的波 長，但是光干涉儀 及光譜儀 的造價成本相對昂貴，並且體積也龐大若是作為一個監測 日常脈搏波型的裝置，顯然不是 一個 很好的提案。
在市面上流通的使用袖帶式透過壓力阻斷血液動計是目前場便宜且能夠準 確量測血壓的監儀器，其缺點也相對明顯不外乎為兩一體積過於龐大造成攜帶困難，另一缺點則是只能單次測量並需要定的時間
本文 旨在透過光學的方式開發一能夠及時並連續測量血壓之計， 並利用光纖布拉格 光柵的原理 製造一透過光功率解調而不是波長，並以此 方法來降低許多的成本 。

Fiber Bragg gratings reflect specific wavelengths of light, and the reflected wavelength is related to the grating period. By applying strain and temperature changes to the grating, the grating period and the fibers refractive index can be altered, thus changing the reflected power. Typically, constructing a sensor based on fiber Bragg gratings requires an optical interferometer or spectrometer to demodulate the reflected wavelength. However, these instruments are relatively expensive and bulky, making them less ideal for a device aimed at monitoring any measurand.
The commonly-used blood pressure monitors in the market employ cuff-based systems that block blood flow through pressure occlusion. These devices are cost-effective and accurate for measuring blood pressure. However, they have two major drawbacks. Firstly, they are bulky, making them inconvenient to carry around. Secondly, they can only provide only one measurements at one operation and require a certain amount of time for each measurement.
The aim of this study is to develop a blood pressure monitor that can measure blood pressure in real time by using an optical approach. By leveraging the principle of fiber Bragg gratings, we aim to create a system that uses optical power demodulation instead of wavelength demodulation, thereby reducing the overall cost.

一、 摘要................................. I
二、 Abstract ............................ II
三、 致謝.................................. III
四、 目錄................................. IV
五、 圖目錄 .............................. VI
六、 表目錄 .............................. VIII
一、 緒論................................... 1
1.1 前言 ................................ 1
1.2 文獻回顧 ........................................ 3
1.2.1 FBG傳感器回顧 ............... 3
1.2.2 感測生理參數的FBG傳感器 ............ 3
1.2.3 感測脈搏訊號的相關文獻 ................ 4
二、 實驗原理 ............................................. 6
2.1 市售血壓原理 ................................ 6
2.1.1 柯氏音法 ......................................... 6
2.1.2 示波法 ................................. 8
2.2 光纖及元件原理 ........................... 9
2.2.1 全反射 ...................................... 9
2.2.2 光纖基本原理 .................. 10
2.2.3 布拉格光柵原理 ....................... 11
2.2.4 光纖布拉格光柵原理及感測方法 ............................................. 12
2.2.5 摻鉺光纖(Erbium-Doped Fiber) ..................... 15
2.2.6 光纖耦合器 .......................................... 16
2.2.7 光隔離器(isolator)............................. 17
2.3 脈波圖 .................................................... 18
三、 實驗介紹與流程 ..................................... 19
V
3.1 實驗架構 ............................................... 19
3.1.1 實驗光學架構 .................................... 19
3.1.2 矽膠模架構 ........................................ 22
3.1.3 擷取訊號裝置 .................................... 24
3.1.4 量測方式 ........................................... 25
3.1.5 血壓估計 ............................................ 28
四、 實驗結果與分析 ...................................... 31
4.1 實驗步驟 ................................................... 31
4.2 實驗結果 ................................................... 32
五、 結論與未來展望 ...................................... 38
六、 參考資料 .................................................. 40

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