光学学报, 2008, 28 (11): 2143, 网络出版: 2008-11-17   

岩层变形检测的光纤光栅多点传感理论与工程应用

Theory of Fiber Bragg Grating Multi-Point Sensing of Rock Deformation and Its Engineering Application
作者单位
1 西安科技大学能源学院, 陕西 西安 710054
2 教育部西部矿井开采与灾害防治重点实验室, 陕西 西安 710054
3 兖州煤业股份有限公司, 山东 邹城 273500
摘要
为了监测松散地层沉降变形, 提出了一种用于钻孔中植入式光纤Bragg光栅传感器(FBG)的结构和传感网络系统。基于室内实验结果, 给出了用于岩层变形检测的传感光栅波长带宽为6 nm, 分析了多点传感信号分辨因子, 由光源带宽决定的测试系统最大实际复用能力为6个传感器。设计并实现了一个由18个光纤光栅组成的具有特色的光纤Bragg光栅波分复用/空分复用混合阵列。工程实践表明, 光纤光栅传感系统采用双回路布置, 可提高系统下放后光纤光栅传感器的成活率。
Abstract
In order to monitor the subsidence and deformation of the unconsolidated strata, a monitoring structure with fiber Bragg grating (FBG) sensors embedded in the borehole and the sensing network system are proposed. With the results from laboratory, the 6 nm wavelength bandwidth of the FBG sensors used for rock strata deformation monitoring is presented. By analyzing the signal resolution factor of the multi-point sensor, the maximum practical six-channel multiplexing of the testing system determined by dominated optical source bandwidth has been researched. A distinctive FBG array composed of 18 FBGs based on wavelength division multiplexing/spatial division multiplexing is designed and implemented. Engineering practice shows the double-loop design can improve the survival rate of FBGs in mines.
参考文献

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刘金瑄, 柴敬, 朱磊, 张广文, 杨建华, 王振平. 岩层变形检测的光纤光栅多点传感理论与工程应用[J]. 光学学报, 2008, 28(11): 2143. Liu Jinxuan, Chai Jing, Zhu Lei, Zhang Guangwen, Yang Jianhua, Wang Zhenping. Theory of Fiber Bragg Grating Multi-Point Sensing of Rock Deformation and Its Engineering Application[J]. Acta Optica Sinica, 2008, 28(11): 2143.

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