光纖感應邊坡穩定監測系統之研發

Development of Fiber Optic Sensored Slop Stability Monitoring Systems

黃安斌 ； 何彥德 ； 簡旭君 ； 黃正中

《光學工程》 87期 (2004/09) Pp. 28-41

https://doi.org/10.30011/OE.200409.0004

摘要

傳統地層滑動監測主要是使用傾斜管的方法來量測土體或岩體內之位移，以人工的方法施測並擷取數據，效率與經濟效益不彰。近年來雖有可長期安裝於地下做自動化監測之電子式傾度感應器的發明，但電子式自動化監測系統具有價格昂貴、易受電磁波之影響而產生訊號雜音、且儀器設備因長期埋入地下容易受潮短路而故障等缺點。以光纖做為感測元件的方法很多，但是這些光纖感測元件對於地層移動之靈敏度與使用之方便性都不理想。光纖光柵(Fiber Bragg Grating, FBG)具有體積小、多點分佈式感測、不受電磁波影響與不易腐蝕改變其性質等優點。作者根據這些光纖感測器之優點來發展地層移動監測系統，已完成光纖光柵應變管與扭曲儀雛形之製作與安裝測試，本文敘述FBG之基本原理並且報告FBG地層移動監測監測系統在交通大學之研發現況。

關鍵字

光纖光柵 ； 地層位移監測

並列摘要

The authors have developed a fiber optic ground movement monitoring system using the optic Fiber Bragg Grating (FBG). A series of FBG's are glued to the outside of flexible plastic elements. These flexible elements are connected together with a single probe. When the flexible element is bent, the FBG would sense the flexural strain as a result of the bending. Twice integration of the strains along the longitudinal axis of the probe yields the distribution of the displacement of the monitoring probe associated with the bending. The FBG sensored monitoring probe can be inserted in an inclinometer casing or directly grouted in a borehole to monitor ground movement. The sensitivity and range of allow able bending of the monitoring probe can be adjusted according to the need in the field. The new system can be used to monitor stability of natural slopes, man-made retaining structures (including dams or dikes). braced cuts. and tunnel excavations, etc. The FBG based monitoring system has been experimented to monitor the displacement distribution of a laterally loaded pile in Yuin-Lin. Taiwan and stability of a Yellow River dike in Honan. China This paper describes the principles of the FBG sensored monitoring probe system and presents field applications of the new sensor systems.

並列關鍵字

Fiber Bragg Grating ； Ground Movement Monitoring