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基于光纤Bragg光栅传感原理与技术,通过实验室力学标定试验建立光纤光栅反射波波长与锚杆轴向应力、温度的物理关系,构建基于温度补偿的光纤光栅测力锚杆受力动态监测技术;并在塔山矿进行井下光纤Bragg光栅测力锚杆受力动态监测试验。试验结果表明,光纤Bragg光栅反射波波长偏移量呈高度线性关系,相关系数达0.99,光纤光栅测力具备高测量精度;但与此同时,光纤Bragg光栅反射波波长对温度变化敏感,温度每升高1℃,光纤Bragg光栅波长大约增加59 pm。基于温度补偿的光纤Bragg光栅井下锚杆受力动态监测系统可实现锚杆工作状态的高精度动态监测。
Based on the principle and technology of fiber Bragg grating sensing, the physical relationship between the wavelength of FBG and the axial stress and temperature of FBG was established by laboratory mechanical calibration test, and the dynamic force monitoring technology of FBG force-measuring bolt based on temperature compensation ; And dynamic stress test of fiber optic anchor rod in fiber optic Bragg grating is carried out in Tashan Mine. The experimental results show that the wavelength deviation of the reflected wavelength of the fiber Bragg grating is highly linear with the correlation coefficient of 0.99 and the FBG force measurement has high measurement accuracy. However, at the same time, the wavelength of the reflected wave of the fiber Bragg grating is sensitive to the temperature change. By 1 ° C, the wavelength of the fiber Bragg grating is increased by about 59 pm. Based on the temperature compensation fiber Bragg raster underground dynamic stress monitoring system can realize the working status of the bolt dynamic monitoring.