【摘要】 针对光纤布拉格光栅(fiber Bragg grating, FBG)在温度测量应用中灵敏度低的问题，本文提出了一种基于高热膨胀系数EpoCore胶裹覆FBG传感器的全新固化增敏方法。采用COMSOL软件构建FBG传感器模型，并对其增敏前后的光栅栅区形变情况进行仿真，结果表明EpoCore胶增敏使FBG传感器的形变量比增敏前提升约10倍。利用紫外曝光技术直接对铥锡共掺光纤进行FBG刻写，并深入研究了EpoCore胶裹覆FBG传感器的固化工艺，当以120℃前烘2 h，紫外光照5 h,120℃后烘3 h时，EpoCore胶固化增敏型FBG的谐振峰随温度漂移具有较好的线性度，其温度灵敏度为90.45 pm/℃，相较未固化增敏的FBG传感器提升约9倍。采用该增敏型FBG传感器对-20℃、30℃、60℃和100℃的环境温度进行测量，均方根差均小于1.3℃。与传统金属镀膜和聚合物镀膜封装方法相比，EpoCore胶增敏效果更为显著，这为FBG传感器在温度测量领域的应用提供新的思路。更多还原

【Abstract】 In response to the problem of low sensitivity of fiber Bragg grating(FBG) in temperature measurement applications, this paper proposes a new solidification sensitization method based on an EpoCore adhesive-coated FBG sensor with a high thermal expansion coefficient. A FBG sensor model was constructed using COMSOL software, and the deformation of the grating area before and after sensitization was simulated. The results showed that EpoCore adhesive sensitization increased the deformation of the FBG sensor by about 10 times compared to before sensitization. Using ultraviolet exposure technology to write FBG onto thulium tin co-doped optical fibers directly and conducting in-depth research on the solidification process of EpoCore-coated FBG sensors, the resonant peak of the solidified and sensitized FBG exhibits good linearity with temperature drift when baked at 120 ℃for 2 hours, irradiated with ultraviolet light for 5 hours, and baked at 120 ℃ for 3 hours. The temperature sensitivity is 90.45 pm/℃, about 9 times higher than the unsolidified and unsensitized FBG sensor. The sensitized FBG sensor is used to measure environment temperatures of-20 ℃, 30 ℃, 60 ℃ and 100 ℃, and the RMSE for these temperatures is less than 1.3 ℃. Compared with traditional metal coating and polymer coating packaging methods,EpoCore adhesive has a more significant sensitization effect, which provides a new idea for the application of FBG sensors in temperature measurement.更多还原