标题: 节理式光纤光栅感测器之研发
Development of an optical fiber grating segmented deflection monitoring probe
作者: 黄正中
Cheng-Chung Huang
黄安斌
土木工程学系
关键字: 节理式光纤光栅感测器;FBG
公开日期: 2004
摘要: 现今常用的地中滑动监测仪器有插入型倾斜仪、定置型倾斜仪、管式应变计和新发展的时域反射法(TDR)监测技术。而插入型倾斜仪由于量测方便、精度高所以使用最频繁,但易受电磁波的影响。定置型倾斜仪虽然可自动化,但所费不赀。管式应变计由于使用应变片贴于管壁上,虽可自动化量测,但因线路庞大又电子讯号的互相干扰,往往影响量测精度。TDR利用电磁脉冲于同轴电缆中行进时,碰到截面变化而反射量测地层滑动,但同轴缆线之变形受到外部束制材料的影响而有所不同,进而影响到滑动量的反算。 本研究主要的目的是希望,利用光纤光栅感测系统单线多点感测及光纤传输不受电磁干扰等特性,发展出一套稳定、解析度高且量测深度不受限之仪器,若再搭配自动撷取以及预警系统,则可不分时间、地点,在危机发生之前立刻采取反应动作,降低灾害的发生。本論文将阐述节理式光纤光栅感测器之发展以及现场测试结果。
The inclinometer probe (IP), in place inclinometer (IPI), pipe strain gage and the more recently developed time domain reflectometry (TDR) technique have been used as tools to monitor ground movement. IP with its advantages of convenience and high resolution is probably the most popular one. The pipe strain gage is made by attaching strain gages on a flexible pipe, can be automated, but is expensive to use. A large number of strain gages and thus signal cables are required in the pipe strain gage, it is likely to be interfered by the electromagnetic noise. TDR senses ground movement through distortion to a coaxial cable induced by the ground movement. The signal can be affected by the nature of the material surrounding the TDR cable. The objective of this reach is to take advantage of the unique capabilities of the fiber Bragg gratings and to develop a stable measurement system with sufficient resolution for ground movement monitoring purposes. When coupled with an automated data logger, the monitoring system is capable of providing early warning againstexcessive ground movement and prevent disasters. The thesis describes the development of this optic fiber grating segmented deflection monitoring probe and the result of its field applications.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009216580
http://hdl.handle.net/11536/72891
显示于类别:Thesis


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