新型光纖生化感測系統之研製

Research and design for a new type optical fiber bio-sensing system

劉哲宇(Che-Yu Liu)

指導教授 ： 王信福

健行科技大學/電資學院/電子工程所/碩士(2010年)

摘要

本論文主要是擬研製出一套新型光纖生化感測系統，此系統之感測元件為一新型光纖生化感測器，其乃是將兩段多模光纖的一端的保護層(jacket)予以剝除，在使用光纖熔接機把兩端剝除光纖連接製成。在本論文中，我們將利用多次內部全反射原理、共光程外差干涉術及遠端擷取控制的方法，來對遠端之待測物質予以進行相關特性(例如：折射率、濃度…. )的檢測研究。我們可於系統之輸出端量取待測物所引起之垂直偏振光與水平偏振光的相位差變化，經由運算可以得知待測物之相關參數。經模擬得知，當此新型光纖生化感測器之感測區域為20cm，其解析度可達到4.7×10−7折射率單位(RIU，reflective index unit)。綜合以上可知，此一新型光纖生化感測系統具有可即時量測、解析度高、靈敏度高、操作容易以及不受環境干擾等等優點，對壓力、溫度、溼度、濃度或折射率的量測及分析而言，是一相當有用的工具。並且吾人深信，此新型光纖生化感測系統，應可幫助國內在相關的生化感測、化學感測及醫療檢驗等領域上，提供良好的建議與研究方向。

關鍵字

多次內部全反射原理外差干涉術 ； 光纖生化感測器

並列摘要

In this thesis, a new type optical fiber bio-sensing system is proposed. It’s sensor of the bio-sensing system is a new-type optical fiber biosensor is based on multiple total-internal reflections, heterodyne interferometry and a remote control method. The sensor is made of two multimode optical fiber which jacket was removed and polished. As a heterodyne optical source is launched into the optical fiber sensor at a suitable incident angle, we can obtain the phase difference between s- and p- polarizations at the output of the optical fiber sensor. By numerical simulation, it is clear that the resolution of the system by using the intensity method can reach 4.7×10−7 refractive index unit (RIU) at least in the measurement range of 1.33 ≤ n4 ≤ 1.37 where is the refractive index of the tested medium. Besides, we will discuss the relation between the phase difference and the wavelength of the incident light. And try to find the optimal parameters of the bio-sensing system. The optical fiber bio-sensing system could be valuable for chemical, biological and biochemical sensing. It has some merits, such as, high resolution and stability, small size and real-time measurement.

並列關鍵字

Multiple Total-Internal Reflections (MTIRs) ； Heterodyne Interferometer (HI) ； Optical Fiber Biosensor

參考文獻

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