【摘要】 为对比不同光纤传感器布设方式对光纤应变传递率的影响,分别建立表贴式和埋入式两种光纤与被测结构的应变传递模型,推导相应的传递系数,通过有限元模型分析验证传递系数的准确性,并基于埋设长度进行敏感性对比分析。结果表明,当埋设长度为1m时,两种方式下光纤中段80%以上区域应变传递率接近1,基体应变均可有效传递至纤芯,两种布设方式均适用于类似结构。光纤两端区域传递率存在不同程度的降低,与埋入式相比,表贴式光纤的两端传递效率低的区域范围更大。敏感性分析表明,随着长度增加,光纤与基体之间的平均应变传递率增高,埋入式始终高于表贴式。因此,对于小型被测基体,布设埋入式光纤更合理;考虑施工及检修,表贴式适合应用于已建大型结构。更多还原

【Abstract】 In order to compare the impacts of different optical fiber sensor layout on the strain transmission rate of the optical fiber sensor,the strain transfer models of the surface-bonded type and directly buried type were established to test substrates.The corresponding transfer rates were derived and numerical analysis of finite element model verified the accuracy of the transfer rate,sensitivity analysis and comparison based on the buried length being tested.The results show that when the buried length is 1 m,the strain transmission rate of more than 80% of the middle section of the fiber is close to 1 in both modes,and the strain of the concrete structure can be effectively transmitted to the core,both layouts are applicable to the similar structures.There is a different degree of reduction in the transmission rate at both ends of the fiber.Sensitivity analysis shows that as the buried length increases,the average strain transfer rate between the fiber and the substrate increases,and the buried type is always higher than the surface mount type.Therefore,it is more reasonable to lay in buried optical fibers for small-sized substrates to be tested;The surface-mounting type is suitable for largescale or the structures that has been built considering construction and maintenance.更多还原