光纖應變感測器之研究

A study of optical fiber strain sensor

簡志雄(Chih-Hsiung Chien)

指導教授 ： 陳兆勛

國立臺灣大學/工學院/應用力學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.10382

摘要

摘 要
有鑒於目前大型結構物之維護與監測，現階段皆仰賴於電子式感測器。不但線路繁瑣，亦只能做點狀分佈量測。而光纖感測器不但具有輕巧方便、線路簡單之特性，更具有分佈式感測與即時監控之功能。本論文重點在於FBG與BOCDA兩種光纖感測器之架構建立與感測應變之效果，並比較與討論目前以布里淵散射為原理之光纖感測器BOTDR與BOTDA。由實驗中可以清楚發現FBG之應變與反射頻率呈線性分佈，而BOCDA之布里淵頻率亦與光纖受外界影響產生之應變呈線性分佈。兩種光纖感測器皆確實可以達到應變感測之結果。此兩種光纖感測為目前解析度最高，且可達到動態感測與遠端監測之優越感測器。期待未來光纖感測能為人類帶來更多的便利與安全。

關鍵字

激發性布里淵散射

並列摘要

Abstract
At present, the maintenance and monitoring of the large-scale structure are all dependent on electronic sensor. The electronic sensor is very complicated, and only point detecting to be examined . The main objective of this research is to study two kinds of optical fiber strain sensor. The two techniques are called “Fiber Bragg Gratings” and “Brillouin Optical Correlation Domain Analysis”. This thesis describe the mechanism of distribution measurement of fiber Brillouin spectrum by Brillouin Optical Correlation Domain Analysis (BOCDA) and multipoint detecting by Fiber Bragg Gratings(FBG).It is expected to be measured in experiments. These two methods have been successfully demonstrated experimentally. Finally,comparing with other kinds of optical fiber strain sensor “BOTDR and BOTDA” that are close to using on the engineering at present. We expect to bring the convenient and safety for human being.

並列關鍵字

SBS

參考文獻

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