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提出了基于能量沉积的γ辐射对光纤折射率的影响分析方法,计算了光纤的色散变量随光纤的V参数、折射率变化,开展了γ辐射对光纤色散影响的测量实验,得到了光纤的色散系数随辐射剂量变化数据。实验及理论计算结果表明:(1)光纤的色散系数随γ辐射剂量的增加而增大,在一定的剂量(0~500 Gy)范围内,光纤色散增加量呈逐渐饱和趋势;(2)γ辐射导致光纤折射率发生变化,从而引起材料色散的变化,辐射效应中的电子密度增大是折射率改变的主要因素;(3)辐射感生损耗引起的信号幅度降低要比辐射感生色散引起的脉冲展宽明显,对于暴露在核辐射环境中的长距离光纤,其脉冲信号产生的畸变是两者同时存在并共同作用的结果。
Based on the analysis of the influence of energy deposition on the refractive index of optical fiber, the dispersion variable of optical fiber is calculated with the change of V parameter and refractive index of optical fiber. The experiment of measuring the dispersion of optical fiber by γ radiation is carried out. The dispersion of optical fiber Coefficient Varies with Radiation Dose Data. The experimental and theoretical results show that: (1) The dispersion coefficient of optical fibers increases with the increase of γ radiation dose, and the increment of optical fiber dispersion tends to be gradually saturated at a certain dose (0 ~ 500 Gy); (2) γ Radiation leads to changes in the refractive index of the fiber, causing changes in the dispersion of the material. Increasing electron density in the radiation effect is a major factor in the change of the refractive index. (3) The reduction in signal amplitude due to radiation induced loss is more pronounced than that induced by radiation induced dispersion The pulse broadening is obvious. For the long-distance optical fiber exposed to the nuclear radiation environment, the distortion of the pulse signal is the result of the coexistence of the two.