本論文主要開發一套沉陷計系統，此系統是利用許多光學儀器與模組並搭配光纖光柵對於壓力與應力的優良特性製作而成，沉陷計可應用於許多基礎建設上特別是監控建築物的垂直位移，在地震頻繁與河流沖刷嚴重的臺灣有不可或缺的腳色，其顯而易見的實際應用例子如橋梁、大樓及基礎建築物。
本論文設計之沉陷計系統搭配之懸吊物為易取得、售價便宜、切割容易及狀態穩定之壓克力，其密度為1.18 g/cm3與水相當相近，故在沉陷計樣品種類選擇5種不同尺寸之壓克力進行水位與波長量測，而光源採用特性優良之摻鉺光纖放大器，接收端選擇對數值敏感的多波長量測儀，透過組合形成一套簡易沉陷計系統。
在光纖光柵讀取機軟體開發本論文採用Visual Basic語言作為使用者介面，並利用自發放大輻射光學模組、可調式光學濾波器、光開關及微控制器電路組成讀取機硬體，再透過微控制器將指令把掃描所得到的光纖光柵反射波長數值以及光功率能有效以圖形化即時呈現，最後亦將光纖光柵讀取機系統分別搭配兩個體積為90 cm3的壓克力樣透過旋轉平台模擬橋梁垂直位移的變化，驗證軟體開發之成效，並將每次掃描得到之資訊，依照時間、掃描通道、反射波長及光功率的順序依序儲存，以利人員追溯歷史紀錄及後續資料分析。

This thesis is mainly to develop a set of subsidence gauge system which composes of many optical instruments and modules with the excellent characteristics of fiber grating for pressure and stress. The subsidence gauge can be applied to many civil engineering for monitoring such as bridges, buildings or infrastructure to observe vertical displacement conditions. The subsidence gauge system plays an indispensable role in Taiwan, where earthquakes are frequent and rivers are severely washed.
The suspended solids which are used in the subsidence gauge system are acrylic that is easy to obtain, inexpensive, easy to cut and stable in state. Its density is 1.18 g/cm3, which is quite similar to water, so five types of acrylic samples are selected to measure water level and wavelength change. Erbium-doped fiber amplifier is selected as the light source with excellent characteristics also the wavelength meter is chosen as the receiver by its numerically sensitive characteristics.
In the development of fiber grating interrogator software, we use Visual Basic language as the user interface page, and uses amplified spontaneously emission optical modules, optical tunable filters, optical switches and microcontroller circuits to form the hardware of optical fiber interrogator. Then through the microcontroller, the reflected wavelength value and optical power of the FBG by scanning can be effectively displayed in real time graphically. Finally, the fiber grating interrogator system is equipped with two acrylic samples with a volume of 90 cm3 to simulate the vertical displacement of the bridge through the lifter to verify the effectiveness of software development, and save the information obtained from each signal in the order of time, scanning channel, reflected wavelength, and optical power, so that operator can trace historical records and follow-up data analysis.

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