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采用碳纤维强化聚合物(CFRP)对光纤Bragg光栅(FBG)进行封装,研制出用于测量混凝土内部应变的FBG应变传感器,分析了传感器轴向应变分布与结构参数的关系。通过在等强度梁和霍普金森压杆(SHPB)上的试验,得到了FBG传感器的静态性能指标和动态响应特性,结果表明,FBG应变传感器线性度≤1%,埋入混凝土结构内的FBG传感器能够真实的反应传感器埋入点混凝土内的应变值,可用于实际工程中混凝土结构内静态和动态应变的测试。
The fiber Bragg grating (FBG) was encapsulated by carbon fiber reinforced polymer (CFRP). FBG strain sensor was developed to measure the internal strain of concrete. The relationship between the axial strain distribution and the structural parameters was analyzed. The static performance index and dynamic response characteristic of FBG sensor are obtained through the experiments on isostatic beam and Hopkinson pressure bar (SHPB). The results show that the linearity of FBG strain sensor is less than or equal to 1%, and the FBG embedded in concrete structure The sensor can truly reflect the strain value of the embedded sensor in the concrete, which can be used to test the static and dynamic strain in the concrete structure in practical engineering.