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为保护光纤光栅,提出了一种镀层和光纤光栅结合良好的无粗化过程的化学镀和电镀保护方法.基于应力分析法,得到镀镍光纤光栅的温度灵敏度公式,采用ANSYS有限元软件分析了电镀后光纤光栅应力随温度变化关系,并进行了实验证实.结果表明:光纤光栅电镀后温度灵敏度理论和实验值分别为20.6951pm/℃、22.076pm/℃.理论分析和实验、仿真结果基本一致.相比裸光纤光栅,温度灵敏度增加到原来的2.2倍.该方法不仅可以获得厚度理想的保护层,还可以提高光纤光栅的温度灵敏度.
In order to protect the FBG, a method of electroless plating and electroplating without coarsening is proposed, which combines the coating and fiber grating.The temperature sensitivity of the nickel-plated FBG was obtained based on the stress analysis method and analyzed by ANSYS finite element software After the plating, the stress of the fiber grating changes with the temperature, and the experimental results show that the temperature sensitivities of the FBG are 20.6951pm / ℃ and 22.076pm / ℃ respectively after theoretical analysis and experiment.The simulation results are basically the same Compared with the bare fiber grating, the temperature sensitivity is increased by 2.2 times. This method can not only obtain the ideal thickness of the protective layer, but also improve the temperature sensitivity of the fiber grating.