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纤芯折射率调制深度是影响布拉格光纤光栅(FBG)蜕化的唯一参数,仿真分析了折射率调制深度对反射谱峰值、过零带宽的影响。利用能级跃迁理论揭示了环境冲击引起势阱电子溢出,进而引起折射率调制深度减小的FBG性能蜕化连环影响机理。设计了试验系统,利用高低温循环试验分别对4个不同应变工况下的FBG进行加速蜕化作用。实验结果表明:温度循环交替冲击会使FBG产生较快的蜕化现象;在各个蜕化阶段,应变越大的FBG蜕化效应愈明显,施加应变为1 500με的FBG在1 000个交变循环后,反射光谱几乎就难以识别,失去传感能力。
The depth of core refractive index modulation is the only parameter that affects the degeneracy of FBG. The effect of refractive index modulation depth on peak reflection and zero-crossing bandwidth is simulated. The energy level transition theory is used to reveal the degeneration chain effect of FBG caused by environmental impact on potential well electron spillover, which leads to the decrease of refractive index modulation depth. A test system was designed to accelerate the degeneration of FBG under four different strain conditions by using high and low temperature cycling tests. The experimental results show that the FBG degenerated rapidly due to the alternating impact of temperature cycling. The more degenerative FBG degeneration occurs at each degeneration stage, the more FBG degeneration effect occurs at 1 500με after 1 000 alternating cycles Almost difficult to identify the spectrum, loss of sensing capabilities.