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光纤布拉格光栅封装后其温度灵敏度与裸光纤光栅有很大不同,这是因为封装材料的性能参数(包括泊松比,弹性模量,热膨胀系数及封装厚度)与光纤光栅的材料性能参数不一致造成的。理论分析了封装材料性能参数对光纤光栅温度灵敏度的影响。讨论了化学镀镍FBG的温度灵敏度公式,理论分析并用实验证明了镀镍层厚度与温度灵敏度的关系,理论分析得到化学镀层厚度分别为2.315μm、16.655μm、85.255μm的镀镍FBG的温度灵敏度依次为12.8406pm/℃、17.9784pm/℃、20.2029pm/℃,实验值依次为12.313pm/℃、17.1pm/℃、20.024pm/℃。理论值与实验值基本一致。
The temperature sensitivity of a fiber Bragg grating after encapsulation is very different from that of a bare fiber grating because the performance parameters of the encapsulation material (including Poisson’s ratio, modulus of elasticity, coefficient of thermal expansion, and package thickness) are not the same as those of the fiber grating of. The influence of the performance parameters of the encapsulation material on the temperature sensitivity of the fiber grating is theoretically analyzed. The temperature sensitivity of electroless nickel-plated FBG was discussed. The relationship between the thickness of nickel plating and temperature sensitivity was theoretically analyzed and verified. The temperature sensitivity of the nickel-plated FBG with the thickness of 2.315μm, 16.655μm and 85.255μm were obtained theoretically Followed by 12.8406pm / ℃, 17.9784pm / ℃, 20.2029pm / ℃, the experimental values were 12.313pm / ℃, 17.1pm / ℃, 20.024pm / ℃. Theoretical and experimental values are basically the same.