| 郭永兴,杨慧,朱家静,胡钊,张航.一种双梁互补式光纤光栅位移传感器及在地铁隧道变形监测中的应用[J].光电子激光,2023,(8):851~860 |
| 一种双梁互补式光纤光栅位移传感器及在地铁隧道变形监测中的应用 |
| A double-beam complementary fiber Bragg grating displacement sensor and its application in underpass tunnel deformation monitoring |
| 投稿时间：2022-05-22 修订日期：2022-08-10 |
| DOI： |
| 中文关键词: 光纤光栅(FBG) 悬臂梁 位移传感器 结构健康监测 |
| 英文关键词:fiber Bragg grating (FBG) a cantilever beam displacement sensor structural health monitoring |
| 基金项目:国家自然科学基金(52075397,52105558)、山东省重大科技创新工程(2019JZZY020314) 和广西重点研发计划(2020AB44003)资助项目 |
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| 中文摘要: |
| 本文提出了一种双梁互补式光纤光栅(fiber Bragg grating,FBG) 位移传感器,实现了正负双向位移的测量。采用双“悬臂梁+楔形滑块”的结构,当一个悬臂梁受位移作用处于变形状态时,另一个悬臂梁不变形并提供温度补偿功能。传感器处于零值测点状态时,两个悬臂梁处于零弯曲状态,且双梁互为温度补偿,消除了温度影响。通过性能测试实验证明,该传感器在±50的量程内,灵敏度为29.369 pm/mm,测量重复性好。制备出8个传感器应用于某市地铁的变形安全监测,从道床沉降、道床环缝、管片环缝3个方面开展了变形测量。在长期监测期间,传感器工作稳定,被测结构变形状态稳定,表明该传感器具有良好的测量性能,适用于长期的结构健康监测。 |
| 英文摘要: |
| This paper proposes a double-beam complementary fiber Bragg grating (FBG) displacement sensor to achieve the measurement of positive and negative bidirectional displacement.The double "cantilever beam + wedge-shaped slider" structure is adopted,when one cantilever beam is deformed by displacement,the other cantilever beam is not deformed and provides temperature compensation function.The two cantilever beams are in zero bend when the sensor is in zero value measurement point state,and the twin beams are temperature compensated for each other,eliminating temperature effects.The performance test experiments prove that the sensitivity of the sensor is 29.369 pm/mm within a range of ±50 and the measurement repeatability is good.Eight sensors are manufactured for deformation safety monitoring of a city metro,and deformation measurements are carried out in three areas:track bed settlement,track bed annulus and segment annulus.During the long-term monitoring period,the sensor workes stably and the deformation state of the monitored structure is stable,indicating that the sensor has good measurement performance and it is applicable to long-term structural health monitoring. |
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