【摘要】 基于光纤Bragg光栅(FBG)传感原理,结合沥青混凝土路面的特点,介绍了传感器应变传感特性与设计封装结构,制作了一种用于监测沥青混凝土应变试验研究的光纤Bragg光栅传感器。通过砝码加载的方法对传感器进行标定,光纤Bragg光栅传感器的应变灵敏度系数为1.1 pm/με,封装工艺没有改变光纤光栅的应变传感特性;传感器埋入SMA-13沥青混凝土后,通过静态试验得到荷载与传感器轴向应变之间的关系为0.038 7με/N;通过ANSYS 11.0仿真传感器静态试验,得到传感器应变灵敏度修正因子η为0.928;进行了5 h动态试验,应用其监测室内车辙试验下沥青混凝土内部结构沿传感器轴向的应变,随着碾压次数的增加,轴向的应变增加。监测结果能够反映沥青混凝土内部结构应变基本变化规律,可用于沥青路面的应变监测,为道路养护决策提供了一种新方法。更多还原

【Abstract】 A packaged FBG strain sensor based on the principle of FBG sensing and characteristics of asphalt concrete pavement was designed for the experimental study on strain monitoring of asphalt concrete.The designed structure of FBG sensor and strain sensing performance was presented.A calibration test for FBG sensor was implemented,its strain sensitivity coefficient of FBG sensor is 1.1 pm/με,and the fiber grating strain sensing performance would not be changed by packaging technology.The correlation between pressure and axial strain is 0.038 7 με/N after embedded in SMA-13 asphalt concrete.Sensor static test by ANSYS 11.0 simulation show that sensor strain sensitivity correction factor η is equal to 0.928.FBG strain sensor was used to monitor internal structure of asphalt concrete axial strain.The dynamic test for 5 hours by rutting test show that when increasing the number of rolling,the axial strain can be increased.Monitoring result can reflect the fundamental changes of strain in structural layers of asphalt concrete.The sensor can be used to monitor the strain of asphalt pavement to provide a new method decision-making for pavement maintenance.7 figs,9 refs.更多还原