新型光纤布拉格光栅温度自动补偿传感研究

Novel Sensing Device of Fiber Bragg Grating with Temperature Active Compensation

将光纤布拉格光栅斜向粘贴于厚度相等的等腰三角形悬臂梁的侧面 ,利用光纤光栅啁啾效应 ,通过测量带宽进行多种力学量的传感研究。理论和实验均证明 ,该传感装置具有温度自动补偿功能。在位移、应力等参量的传感实验中获得了很好的线性响应 ,位移和应力传感的灵敏度分别为 2 4 7nm mm和 2 .2 6nm N ,光纤光栅实验带宽达 15 5nm。

A fiber Bragg grating (FBG) is bonded to the side of the isosceles triangle cantilever beam with a determinate angle along the beam axis. Using the effect of FBG's chirp, the sensing of many parameters about dynamics has been studied through measuring the FBG's bandwidth. It is demonstrated in theory and experiment that this sensor can be automatically perform compensation for the FBG's wavelength shift induced by temperature. In the experiments of displacement and stress, a good linear response has been obtained, the sensitivities of displacement and stress are 2.47 nm/mm and 2.26 nm/N, respectively, and the FBG's bandwidth can be changed to 15.5 nm.