【摘要】 为实现对高铁站房空间网架结构变形的监测,并针对光纤布拉格光栅(FBG)对应钛合金TA2杨氏模量较小等材料特性,本文首次设计了一种圆弧铰链式FBG双向倾角传感器,同时在此基础上进行了理论分析、有限元模拟和传感器性能试验。并进行了结果对比与误差分析。该传感器的敏感结构是双轴圆弧铰链,通过将预拉伸后的FBG粘贴在与圆弧铰链相连的上下基座的导纤槽,实现对被监测对象的倾斜角度双向监测。实验结果表明,该FBG双向倾角传感器的灵敏度为168.43 pm/deg,有效监测范围为±15°,在监测范围内线性相关度可达0.999 9,同时消除了温度影响,适用于温度变化较大且精度要求较高的工作环境,特别是高铁站房顶部网架结构变形的实时监测。更多还原

【Abstract】 In order to monitor the deformation of the space grid structure of high-speed railway station buildings,and to address the problem that the fiber Bragg grating(FBG) is sensitive to both strain and temperature,a biaxial arc hinge FBG inclination sensor,using the titanium alloy TA2 which possesses low Young′s modulus and other superior material properties,is designed at the first time in this paper.Based on this design,theoretical analysis,finite element simulation as well as sensor performance tests are carried out respectively.At the meantime result comparison and error analysis are also presented comprehensively.The sensor′s sensitive structure is a biaxial arc hinge.The pre-stretched FBG is attached to the fiber guide grooves of the upper and lower bases connected to the arc hinge to realize two-directional monitoring of the object′s tilt angle.Experimental results show that the sensitivity of the biaxialarc hinge FBG inclination sensor is 168.43 pm/deg,the effective monitoring range is ±15°,and the linear correlation within the monitoring range can reach 0.999 9.At the same time,the temperature effect is eliminated successfully,which is suitable for large temperature changes and high accuracy requirements,especially for deformation monitoring of the space grid structure of high-speed railway station buildings.更多还原