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Title: | 布拉格光纖光柵探針應用於壓力量測 Fiber Bragg Grating Pressure Probe |
Authors: | Jia-Han Ou 歐佳翰 |
Advisor: | 單秋成 |
Keyword: | 布拉格光纖光柵,壓力感測器,生物腔內, Fiber Bragg Grating,Pressure probe,Bio tissue, |
Publication Year : | 2009 |
Degree: | 碩士 |
Abstract: | 以往用來量測生物腔內壓力的感測器是以載有電阻式應變計的感測元件所製成,此種類型的壓力感測器需具有較大的尺寸,對於侵入生物體量測壓力會造成一定的損傷。此外感測元件需要導入電壓才能量測壓力,可能因為絕緣問題而造成觸電的危險。
本研究使用尺寸小且不需導電的光纖製作壓力感測器,並且以布拉格光纖光柵當作感測元件,埋入針管之中用來量測液體壓力。光纖壓力感測器是以針管側邊製作出量測壓力的窗口。本實驗室之前是採用高分子材料填入量測的窗口作成傳遞壓力變化的薄膜,但由於高分子材料本身較不穩定,在受到固定壓力的情況下還會有持續變形的可能,並且可承受壓力較低容易產生破裂。於是本研究使用金屬薄膜當作量測壓力變化的媒介,在量測窗口外側黏貼一層鋁或銅金屬薄膜,透過金屬薄膜傳遞液體壓力變化,可增加量測過程的穩定性和耐壓性。實驗中以液體靜壓力的油壓系統模擬生物腔內的壓力環境,將光纖壓力感測器放入油壓系統內進行壓力量測。光纖壓力感測器的線性度可以達到0.99,波長和能量靈敏度分別為0.51pm/KPa和0.378mV/KPa。 Conventional pressure sensor for bio-mechanical measurement used strain gage element. These are relatively large in size and required excitation, making the measurement fairly invasive and carrying the danger of electric shock. In this study, we fabricated a pressure probe based on Fiber Bragg Grating. Previous effort in this line used polymer as the pressure boundary diaphragm which was prone to break at intermediate pressure and had a lagging response because of the viscoelastic property of polymers. The current work, thin aluminum or copper films have been employed as diaphragm. These metal films could increase the stability of and capacity of pressure range during measurement. By simulating the hydraulic pressure of bio tissue in an oil cylinder, sensitivity of the fiber pressure probe was found to be 0.51pm/KPa for wavelength calibration and 0.378mV/KPa for energy calibration, and have coefficient of determination 0.99. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42766 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 機械工程學系 |
Files in This Item:
File | Size | Format | |
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ntu-98-1.pdf Restricted Access | 2.01 MB | Adobe PDF |
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