Working life time is the key factor which influences the performance of fiber Bragg gratings(FBG). So the study of FBG thermal decay and predicting of the FBG thermal decay under various temperatures are proposed. The formation of FBG and the thermal degeneration process were explained with the boundary energy theory. Thermal accelerated decay experiments were carried out under 600℃ , and the experiments data were used to model a FBG thermal decay prediction with aging curve method. The prediction formulation varied as working temperature and working time in thermal environment. And the attenuation of reflectivity of FBG was down to 90% operated in 30°C , 50°C , 100°C were known as 23. 11 and 3 years, respectively. It can also be seen from the result that the FBG still kept on thermal decay after annealing.%光纤布拉格光栅的工作寿命是影响光纤光栅传感器性能的关键因素.从光纤布拉格光栅的热致衰减特性出发,以界面阻隔能模型为理论基础,以光纤光栅的反射峰值为研究对象,探讨了光纤布拉格光栅的热致衰减行为.并通过对比试验对3支不同的光纤布拉格光栅进行了600℃热加速衰减实验,初步证明即使进行了退火处理,光纤布拉格光栅的性能仍然存在热致衰减蜕化.从实验数据中得到了光纤布拉格光栅的热振动频率,建立了热致衰减曲线.预测了30℃、50℃、100℃条件下光纤布拉格光栅的反射率衰减到90％的时间分别为23年、11年和3年.
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