臺灣博碩士論文加值系統

本研究以熔拉光纖 (Tapered Fiber: TF)為主要的干涉儀結構，發展兩種靈敏之智慧型熔拉光纖干涉儀感測器，架構分別是 Michelson 與Mach-Zehnder 光纖干涉儀分別應用於風向、風速以及旋轉角度之量測。
風速風向 Michelson 光纖干涉儀是一種創新、簡單、具方向性且為靈敏性高的氣流感測器，利用扁平光殼光纖，經由熔拉處理所製成的熔拉光纖干涉儀，此干涉儀因風速之作用，則將造成光纖干涉儀彎曲，干涉頻譜因而變化而間接測得風速，若是用結構非對稱之扁平光殼光纖，更可以從實驗中量測到的干涉條紋的波長位移、可見度(visibility)變化、以及平均損耗的變化皆與方向有關，間接測得作用在元件的風速大小或風向(角度)。
另一個元件是連續兩次熔拉所形成之 Mach-Zehnder 光纖干涉儀，它可以發展成一種靈敏、簡便且價格低廉的角度旋轉感測器，實驗結果顯示，此干涉儀會受旋轉(扭轉)角度不同，造成干涉條紋的波長位移與能量損耗相對於角度之變化，當光纖熔拉的細度越細，干涉頻譜之波長位移與能量損耗相對於旋轉角度變化亦較大，代表具有較靈敏的特性。

We have developed two kinds of highly sensitive tapered fiber interferometers (TFI) sensing devices that have smart configurations and high sensitivity for parametric sensing applications. The first fiber sensor demonstrates a novel, directional and sensitive fiber anemometer based on tapered fiber Michelson interferometer configuration. The proposed anemometers based on an anisotropic flat-clad tapered fiber Michelson interferometer enables sensing the direction and magnitude of flowing air (wind) simultaneously.
Wavelength shifts and fringes visibility of the measured interference fringes are correlated with the magnitude as well as the direction of the wind. Experimental results show that the proposed directional anemometer can simultaneously and effectively indicate the direction, and sensitively measure the magnitude of wind.
Another tapered fiber sensor is based on a fiber Mach-Zehnder interferometer (FMZI) by cascading two fiber tapers. The FMZI can be as a twist fiber sensor to achieve a highly sensitive and in-line sensing.
Spectral sensitivity of the proposed sensor strongly depends on taper waist and thinner waist possesses higher sensitivity. Experimental results show that wavelength shifts and spectral loss of the interference fringes depends on the twist angles.

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目錄
致謝…………………………………….…………………..…………….1
摘要…………………………………….…………………..…………….2
Abstract…………………………………………………………………...3
目錄…………………………………………………..………………......4
圖目錄………………………………………………………..……....…..6
表目錄…………………………………………………………………....8
第一章 緒論
1.1 研究背景……………………………………..…..................9
1.2 研究動機與目的……………………………………….......10
第二章 熔拉光纖干涉儀
2.1 熔拉光纖特性與結構…..……………………..….………..14
2.2 熔拉光纖的應用………………………...…..…..................16
第三章 單擺式熔拉光纖干涉儀於風速感測應用
3.1 單擺式熔拉光纖干涉儀元件製作……………..….............20
3.2 風速感測原理.......................................................................22
3.3 單模熔拉光纖干涉儀於風速感測的基本架
構…….…...………………………………………................27
3.4 單擺式 SMTFI 於風速感測實驗結果.…......…....…....…...29
3.5 扁平光殼光纖熔拉光纖干涉儀於風速風向感測的基本架構..……………………………………………....................33
3.6 單擺式 FCTFI 於風速風向感測的實驗結果……….........35
第四章 Mach-Zehnder 熔拉光纖干涉儀於旋轉角度感測應用
4.1Mach-Zehnder 熔拉光纖干涉儀元件製作…………..........40
4.2MZTFI 於旋轉角度感測的實驗架構……………………...40
4.3MZTF 用於旋轉角度感測的實驗結果與分析…………...41
第五章 結論………………………………………..…..…...…………..49
參考文獻………………………………………………..……................52

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