請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/39423
標題: | 微結構材料的光-機械應用:
1)光纖布拉格光柵感測器 2)雷射趨動高分子微感測器 Opto-Mechanical Applications of Microstructured Materials: 1)Fiber Bragg grating sensors 2)Laser-driven polymer micro-sensors |
作者: | Chih-Lang Lin 林志郎 |
指導教授: | 單秋成(C.C. Shin) |
關鍵字: | 阿基米德螺旋,非均佈應變場,微幫浦,光鉗,高分子,雙光子吸收,FBG感測器,光譜,微黏度計,高分子化,微感測器,光纖布拉格光柵, micropump,non-uniform strain field,polymer,microsensor,spectrum,FBG sensor,micro-velocimetry,two-photon absorption,polymerization,micro-viscosimetry,Archimedes screw,fiber Bragg gratings,optical tweezers, |
出版年 : | 2004 |
學位: | 博士 |
摘要: | 本論文包含兩個主題:光纖布拉格光柵(FBG)感測器和雷射趨動式高分子微感測器.在第一部份中,主要提出分析一個作用於非均佈應變場的FBG反射頻譜的架構,和量測微裂縫尖端應變的實驗結果,並且檢驗FBG 的gauge length在量測應用上的影響,本實驗的結果可用來做為推斷或分析非均佈應變場的參考資訊。第二部份乃是研究雷射趨動式高分子感測器在黏度計,流速計和微幫浦等之應用。這些感射器是以低成本的雙光子吸收高分子化技術快速地製成,可自由地在液體中游動,而以線性極化雷射光鉗抓取和控制,在雷射焦聚處產生光扭矩,得以藉此方式測量該處之流體特性。黏性和流速感測器具平板形狀並都會依極化方向排列。其中,黏性的量測可藉由轉動線性極化方向所產生的最大旋轉頻率得到,而液體流速則是藉由量測光扭矩和拖曳扭矩的平衡角度所得,這些實驗結果與理論計算所得非常吻合。最後,微幫浦具阿基米得螺旋形狀的微尺寸,當其被雷射抓取於焦聚時會依其長軸方向旋轉,此旋轉的原理是由於雷射光射散到螺旋上所轉換成的光扭矩所造成。 This work involves two topics which are fiber Bragg grating (FBG) sensors and laser driven microsensors. In the first part, a framework for the interpretation of reflected FBG spectra under a non-uniform strain field is proposed and experimental results for a crack tip strain field are presented. The effect of FBG gauge lengths on the measurements is examined and interpreted. The results are analyzed to see what information can be derived and how accurate the interpreted strain results are. In the second part, the fabrication of laser driven polymer microsensors for viscosimetry, velocimetry and micropump applications is considered. These sensors are readily made with a low-cost polymerization technique based on two-photon absorption. A linearly polarized optical tweezers is used to trap one sensor, freely floating in the liquid to be characterized, at the laser focal point and to generate the optical torque needed for local hydrodynamic measurements. Viscosity and velocity microsensors have slab shapes that align in the polarization direction. The local viscosity is deduced from the maximum rotation frequency generated by the rotating linear polarization, while the fluid velocity is obtained by measuring the maximum angle that equilibrates the optical and drag torques. The experimental results are in good agreement with the theoretical calculations. Micropumps are micron-size Archimedes screws that rotate around their long axis when trapped at the focal point. The rotation is due to the optical torque that is transferred by the laser scattering on the screw. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/39423 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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