光纤光栅索力传感器的酸碱耐久性
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TU375

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国家自然科学基金(52068014);广西创新驱动发展专项(桂科AA20302006);广西重大科技创新基地建设(2018-242-G02)


The acid-base durability of fiber bragg grating cable force sensor
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    摘要:

    拉索作为斜拉桥的主要受力构件常处于复杂、恶劣的工作环境,传统的索力监测手段存在一定的局限性。本文将光纤光栅传感器内嵌封装进金属承压块上的凹槽,研制了一种光纤光栅索力传感器,并对两种环氧树脂胶粘剂封装的光纤光栅索力传感器在酸碱腐蚀环境下的耐久性能进行了研究,然后依托逆幂律模型与老化动力学理论,推导出传感器寿命预测方程。试验结果表明:该传感器的线性度和稳定性良好,传感器在腐蚀溶液中失效的主要原因是封装部位界相区胶粘剂受腐蚀剥落。A类传感器的耐酸碱性强于B类传感器,A类传感器在弱酸弱碱环境中的使用寿命均超过35年,大于斜拉桥拉索平均20年的换索年限,可以实现拉索全生命周期的监测。

    Abstract:

    As the main force-bearing component of cable-stayed bridges, cables are often in complex and harsh working environments, and traditional cable force monitoring methods have certain limitations. In this paper, a fiber grating cable force sensor is developed by encapsulating the fiber grating sensor embedded into the groove on the metal pressure block, and the durability performance of two epoxy resin adhesive encapsulated fiber grating cable force sensors in the acid and alkali corrosion environment is studied, and then the sensor life prediction equation is derived by relying on the inverse power law model and aging kinetic theory. The test results show that the sensor perform well on the linearity and stability, and the main reason for the failure of the sensor in the corrosion solution is the corrosion and peeling of the adhesive in the boundary zone of the package site. The acid and alkali resistance of class A sensors is stronger than that of class B sensors, and the service life of class A sensors in weak acid and weak alkali environments is more than 35 years, which is longer than the average cable change life of cable-stayed bridge cables of 20 years, and can realize the monitoring of the whole life cycle of cables.

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覃荷瑛,祝健强,李纯德,等. 光纤光栅索力传感器的酸碱耐久性[J]. 科学技术与工程, 2024, 24(20): 8606-8614.
Qin Heying, Zhu Jianqiang, Li Chunde, et al. The acid-base durability of fiber bragg grating cable force sensor[J]. Science Technology and Engineering,2024,24(20):8606-8614.

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  • 收稿日期:2023-08-09
  • 最后修改日期:2024-05-06
  • 录用日期:2023-12-01
  • 在线发布日期: 2024-07-26
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