As material characteristics of a bond layer directly affect the measurement accuracy of Fiber Bragg Grating(FBG) strain sensors,this paper simulates the impact of elastic modulus of the bond layer materials on strain transfer coefficient K according to the bond layer strain transfer model and the formula of strain transfer coefficient K under the premise of determining the structure size parameters. The results show that the strain transfer efficiency of metal is superior obviously to that of the organic adhesive. A contrast test is carried out. Test results indicate that the strain transfer coefficient K of the lead maintains a level of 0. 98 while that of epoxy maintains about 0. 90,and the former's transfer efficiency has increased by 8. 9% as compared with that of the latter. By replacing epoxy with the lead,it can greatly improve the strain measurement precision, and can more fully exert fiber optic sensors' strain measurement ability.%考虑光纤Bragg光栅(FBG)粘接层的材料特性会直接影响FBG传感器的应变测量精度,本文根据粘接层应变传递模型,结合应变传递系数K的表达公式,在确定粘接层结构尺寸参数的前提下,仿真分析了粘接层弹性模量对应变传递系数K的影响.分析结果表明,金属材料的应变传递效率明显优于有机胶的应变传递效率.进行了传递效果评价对比试验,结果表明,铅粘接层的应变传递系数维持在0.98左右,环氧树脂粘接层的应变传递系数维持在0.90左右,前者比后者的应变传递效率提高了约8.9％,显示将粘接材料由环氧树脂改进为铅后,可大大提高应变测量的精度,更加充分发挥光纤器件自身优越的应变测量能力.
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