表面式光纤布拉格光栅传感器应变传递机理的研究

Study on Strain Transfer Mechanism of Surface Fiber Bragg Grating Sensor

建立了组合梁与光纤布拉格光栅(FBG)传感器应变传递的力学试验模型,得出组合梁结构实际应变与表面式光纤布拉格光栅传感器应变的关系。对影响表面式光纤布拉格光栅传感器平均应变传递率的影响因素进行了理论分析,得出胶接层弹性模量,胶接层的宽度以及光纤的粘贴长度对应变传递率影响较大,通过实验确定它们之间的最佳组合,为以后的实际工程应用提供了参考。

The mechanic model of surface fiber Bragg grating （FBG） sensor is built to study the strain transfer between the composite beam and the surface FBG sensor. The relationship between the actual strain of composite beam and the strain of surface FBG sensor is deduced. Various factors which influence the average strain transfer rate of surface FBG sensor have been analyzed. Modulus elasticity, width of the cementing layers length of the fiber pate are primary factors to influence the strain transfer rate. A optimum combination of the three factors is determined through an experiment, which proides reference for practical engineering application in future.