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为研究适于大型工程长期健康监测的耐久性光纤光栅(FBG)应变传感器,提出并实现了传感光纤无机-聚合物-金属的耐久性组合式封装。对传感元件应变传递的理论计算结果表明,光纤的应变传递机制主要依赖于封装结构的无机内核,金属外套用于工程安装初期对无机内核的保护,聚合物主要起这两者间的连接作用,其应变传递机制被抑制,故即使其力学或材料性能发生转异或劣变,亦不对传感器的耐久性产生显著影响;应变测试的理论分析及模型实验结果均表明,相对于普通聚合物封装的FBG传感器,组合式封装传感器的检测精度有明显提高,验证了理论分析结果的可靠性。
In order to study the durable FBG strain sensor which is suitable for the long-term health monitoring of large-scale projects, the durable combined package of sensing fiber inorganic-polymer-metal is proposed and implemented. The theoretical calculation of the strain transfer of the sensing element shows that the strain transfer mechanism of the optical fiber depends mainly on the inorganic core of the package structure, and the metal jacket is used for the protection of the inorganic core during the initial installation of the project. The polymer mainly functions as the connection between the two , The strain transfer mechanism is suppressed, so even if the mechanics or material properties of the mutation or deterioration, it does not have a significant impact on the durability of the sensor; the theoretical analysis of the strain test and the model experimental results show that compared with ordinary polymer package The detection accuracy of FBG sensor and combined package sensor is obviously improved, which verifies the reliability of the theoretical analysis results.