溫度無感之布拉格光纖光柵傾斜感測器

Temperature-Independent Fiber Bragg Grating Tilt Sensor

沈明永(Ming-Yong Shan)

指導教授 ： 王立康

國立清華大學/電機資訊學院/電機工程學系/碩士(2007年)

https://doi.org/10.6843/NTHU.2007.00138

摘要

我們的感測元件在製作方式上，排除了擺垂(而是放置鐵球)、圓棒、剛性盒子等零件的多點黏貼情形；在選用材料上，使用費用較為低廉之水管帽(PVC)充當主體，因此在量測穩定度與經濟上都極具優勢。另外，不同於先前的光纖光柵傾斜感測器研究，除了能獲得傾斜的角度還可藉由反射頻譜中心波長判斷傾斜的方向。
我們採用摻鉺光纖放大器(EDFA)的輸出光(ASE)作為系統所需的寬頻光源(BBS)，光源經由1:99的coupler之後，一部分的光被power meter偵測，另一部分的光通過第一個 3dB coupler時，能量會平均分散(50/50)至兩條光纖路徑，分別傳遞至反射波長較短的布拉格光纖光柵(FBG S)、反射波長較長的布拉格光纖光柵(FBG L)，此時，將獲得FBG S、FBG S的反射訊號。最後，我們便能利用optical spectrum analyzer(OSA)、power meter讀取FBG S、FBG L的疊加頻譜功率以及個別頻譜波長，並根據相關理論計算出環境溫度以及傾斜角度的大小。
本論文利用個別頻譜反射中心波長的變化，於 時量測所得角度，準確度、解析度分別可達 、 ；另外，在溫度的量測上，亦
可藉由疊加頻譜功率的變化來判讀，其準確度、解析度分別為1.74℃、0.039℃。

關鍵字

傾斜 ； 光纖光柵 ； 感測器

並列摘要

Our feeling measured the part in the manufacture way, removed the pendulum to hang (but is lays aside iron ball), round components and so on stick, rigid box. mounts pastes the situation; In selects on the material, a working costs more inexpensive water pipe(PVC) acts as the main body, therefore all extremely has the superiority in measuring the stability and the economy. Moreover, was different to the formerly optical fiber diffraction grating inclines the sensory element research, except could obtain the angle which inclined also to be possible the affiliation the direction.
We use mixes the erbium optical fiber amplifier (EDFA) the output light (ASE) to take the system needs wide frequency light source (BBS),light source after 1:99 coupler, part of light are detected by power ,When another part of light through first 3dB coupler, can meet the average to disperse (50/50) to two optical fibers diameters ,separately transmits to the reflection wave length shorter Bragg optical fiber diffraction grating (FBG S), the reflection wave length longer Bragg optical fiber diffraction grating (FBG L), This time, will obtain FBG S, the FBG S echo signal. Finally, we then can using optical spectrum analyzer(OSA),power meter read take FBG S, the FBG L superimposition frequency spectrum power as well as the individual frequency spectrum wave length, and according to correlation theoretical calculation ambient temperature as well as angle of tilt size.
Present paper use individual frequency spectrum reflection center wavelength change, Surveys the obtained angle at , The accuracy, analysis separately may reach 、 ； Moreover, in temperature survey, Also may the affiliation interpret by the superimposition frequency spectrum power change, The accuracy, analysis separately may reach1.74℃、0.039℃。

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