本論文中，我們將探討微應變量測的研究與應用。不同應變量變化將被使用來改變單模光纖的相位，並於光學低同調干涉(OLCI)系統測量對應相位的應變效應，其中包含中心波長1550奈米的超螢光發光二極體(SLED)，馬赫詹德(Mach-Zehnder)干涉儀產生之干涉圖形(Interferogram)，也稱為傅立葉光學。我們同時在干涉儀中，外加中心波長1310奈米波長雷射的光源，其干涉圖之間距形成絕對光學尺的刻度，以減少電動平移台移動誤差，其後光源再接至分波多工耦合器(WDM Coupler)，將兩個不同波長之光源分開取出其干涉圖形，如此不僅可監測微應變量，更可達到650奈米的解析度。以本實驗室之馬赫詹德干涉儀作為量測時，對於應變的測量可達到 ，而我們將馬赫詹德干涉儀改良為串聯式馬赫詹德干涉儀，其優點為感測靈敏度提高一倍且減少由光耦合器造成的差入損耗，對於應變的測量可提升至 之靈敏度。
其次為使用傳統的布拉格光纖光柵(FBG)測量應變，藉由外加在光柵之應變造成的應力效應，測量其布拉格波長的偏移量，布拉格中心波長對應變的實驗結果量測可達 之靈敏度。
另外我們亦將布拉格光纖光柵與馬赫詹德干涉儀互相結合，將感測路徑加入光柵，利用SMF-28光纖測量長範圍數微米之應變，光纖光柵測量小範圍數奈米之微應變，並利用光纖光柵反射波取代外接之可調變波長雷射作為光學尺的光源，且光纖光柵之反射波無須使用分波多工耦合器進行分波，如此一來便可達成長範圍之應變與小範圍之應變同步監測的系統。

In this thesis, we investigated, designed and analyzed the fiber sensing systems for microstrain applications. A super-luminescent diode (SLED), which had a maximum output at 1550-nm wavelength, involved with a 1.3-m wavelength distributed feedback laser as the optical ruler and propagated through optical low coherence interferometer (OLCI), where the fiber was installed in one of two arms followed by a scheme of the wavelength division multiplexer (WDM) couplers, photo-detection, and electric noise filtering. A Mach-Zehnder interferometer (MZI) built with the SMF-28 fiber sensing arm was demonstrating the strain sensitivity up to , and we proposed a cascaded MZI, it could improve the sensitivity of the system and decrease the insertion loss by the optical coupler. The strain sensitivity up to .
The traditional fiber Bragg grating (FBG) was then utilized to show the resonance wavelength caused by the stress parameter using the grating strain effect. The sensitivity could achieve .
Finally we put the two fiber sensors, SMF-28 fiber and FBG, together for strain monitoring applications. Moreover, the contra-directional narrow linewidth spectrum from FBG was simultaneously utilized as the optical ruler for the cascaded MZI OLCI, which can significantly reduce the cost by eliminating the WDM couplers for traditional optical ruler system. We successfully demonstrated the strain monitoring system for large and small scales by cascaded MZI OLCI with the FBG contra-directional spectrum optical ruler.

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