運用低同調干涉儀於液體折射率量測之溫度效應

Temperature Effect on The Refractive Index of Liquid Sample by Low-Coherence Interferometry

許凱倫(Kai-Lun Shiu)

指導教授 ： 鄭旭志

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2014年)

https://doi.org/10.6827/NFU.2014.00027

摘要

低同調干涉儀（Low Coherence Interferometer；LCI）是以麥克森干涉儀為基礎的技術，具備非侵入式、高解析度和高靈敏度的特性。當LCI的光源進入樣品時，由於樣品介質的不同，在樣品中的光路徑長度也會不一樣，且光程差小於光源同調長度時即產生干涉。在論文中，將利用此系統架構對液體進行量測與分析。

利用低同調干涉儀的技術對液體樣品進行濃度與折射率之溫度效應的量測，本論文是使用一個基本的時域式低同調干涉儀(TDLCI)架構針對不同濃度的液體之溫度效應進行量測，進而獲得樣品的折射率與厚度，整個系統是由光學光纖的4x4耦合器來呈現，其優點包括光纖靈活度、架構簡單並且也免疫外部影響。

本實驗為3x3光纖式系統架構，在樣品端的部分使用垂直架設的方式對液體樣品進行量測，且液體的載具放置在加熱平台(Corning PC-420D)上，使得量測過程更為方便且具有同時量測樣品折射率與厚度的能力。

關鍵字

低同調干涉儀 ； 液體量測 ； 折射率與濃度

並列摘要

Low Coherence Interferometer (LCI) is a technique based on a Michelson Interferometer, with non-invasive, high-solution, and high-sensitive features. When a light path arrives in the sample, the path length may vary in different media; besides, when the optical path difference is shorter than the coherence length, it may interfere. In the study, the researcher adopts the configuration to measure and analyze in different liquid solutions.

The researcher utilizes LCI to measure the effect of temperature and the refractive index in different liquid solutions, and uses a basic Time Domain Low Coherence Interferometer (TDLCI) to test the effect of temperature on different concentration of liquid solutions; then, obtains the refractive index and thickness of the sample. The configuration uses a 4x4 optical coupler to conduct the experiment since it has the advantages of high sensitivity, has a simple structure, and can eliminate external factors.

The experiment uses a 3x3 TDLCI; in the sample port, the researcher installs the sample on the vertical axis, the liquid holding device places on the hot plate (Corning PC-420D), which makes the measurement more simple and can measure the refractive index and thickness of the sample.

並列關鍵字

low-coherence interferometer ； liquid measurement ； refractive index and concentration

參考文獻

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