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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6nm,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。
In order to monitor deformation and deformation of loose ground, a structure and sensing network system for implanting FBG sensor (Bragg Grating Sensor) in borehole was proposed. Based on the indoor experiment results, the wavelength bandwidth of the sensing grating for rock deformation detection is given as 6nm. The multi-sensing signal resolution factor is analyzed. The maximum practical multiplexing capability of the test system, which is determined by the light source bandwidth, is 6 sensors. A mixed fiber Bragg grating wavelength division multiplexing / space division multiplexing array composed of 18 fiber gratings is designed and implemented. The engineering practice shows that the FBG sensing system adopts double circuit layout, which can improve the survival rate of the FBG sensor after system decentralization.