双悬臂梁光纤Bragg光栅应力传感器

报道了一种新颖的光纤Bragg光栅应力传感器.理论分析和实验证明了这种传感器Brrag光栅中心波长随应力变化的线性工作区.将光纤Bragg光栅贴于双悬梁的梁端面,在双悬梁的自由端部施加载荷,对光纤Bragg光栅的应力响应特性测试.当所加载荷为300 g时,光纤Bragg光栅中心波长变化了0.156 nm.从实验上获得了－0.05 nm/N的应力响应灵敏度.该结构具有应力增敏作用,且应力响应的线性、重复性和迟滞性较好.应力响应灵敏度随着梁的大小以及材料的力学参量的改变而改变.

FBG Sensor for Stress Based on Double Cantilever Beam

A novel fiber Bragg grating sensor for stress sensing is proposed.The linearity range between the central wavelength and the load was analyzed and proved.The fiber Bragg grating (FBG) was stickled to the free arm of the double cantilever and its stress response was obtained when adding load to the free end of the double cantilever.The result shows that the wavelength of FBG shifts about 0.156 nm when the load is 300g, the sensitivity (-0.05 nm/N) of the system is reached from experiment,this kind of FBG sensor have a function to improve the sensitivity of stress.And there was a very good linearity and repetition between the central wavelength of fiber Bragg grating and stress,and there is no hysteresis effect.It is also indicated that the stress sensitivity of the sensor varies with the size of the double Cantilever Beam and the mechanical parameters of the material.