Acta Optica Sinica, Volume. 28, Issue 11, 2143(2008)
Theory of Fiber Bragg Grating Multi-Point Sensing of Rock Deformation and Its Engineering Application
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.
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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