Study on Temperature Effect of FBG Strain Sensors for Structural Health Monitoring

被引：0
|
作者：
Zhu H. [1 ,2 ]
Zhou G. [1 ]
Qi H. [3 ]
Sun M. [1 ]
Zhu B. [1 ]
Feng T. [3 ]
机构：
[1] School of Earth Sciences and Engineering, Nanjing University, Nanjing
[2] Nanjing University High-tech Institute at Suzhou, Suzhou
[3] China Construction Science and Technology Group Co., Ltd, Shenzhen
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2020年 / 28卷 / 06期
关键词：
Calibration test; Correction coefficient of temperature grating; Correlation coefficient; FBG strain sensor; Fiber optic sensor; Strain monitoring; Temperature compensation; Thermal strain;
D O I：
10.16058/j.issn.1005-0930.2020.06.014
中图分类号：
学科分类号：
摘要：
Fiber Bragg grating(FBG) strain sensors have unique advantages over traditional strain sensors, including superior durability, electromagnetic resistance, and quasi-distributed sensing capability, therefore they are especially suitable for structural health monitoring.However, due to the strain-temperature cross-sensitivity effect, FBG sensors have a limited accuracy.To solve this problem, this study is carried out in two aspects.Firstly, the correction coefficient of temperature grating is proposed to improve the temperature compensation system of FBG, and the calibrations of two different types of FBG strain sensors through laboratory tests verify the feasibility of this method.Secondly, in order to separate the load strain and the thermal strain effectively, the theoretical formula of strain separation is deduced, and a "correlation coefficient" method is proposed to determine the correction coefficient of temperature effect in the theoretical formula.This method is applied to analyze the strain monitoring data in a building reconstruction project in Shenzhen, China.The results show that the load strain and thermal strain can be effectively separated by using this method.It is found that the thermal strain increased with the increase of external temperature during the monitoring period, while the load strain fluctuated only within a certain range.Finally, the validity of strain separation results is analyzed.This method will provide an important basis for accurate extraction, analysis and prediction of FBG strain data. © 2020, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
引用
收藏
页码：1420 / 1432
页数：12
相关论文
共 26 条
  • [1] Hill K O, Meltz G., Fiber Bragg grating technology fundamentals and overview, Journal of Lightwave Technology, 15, 8, pp. 1263-1276, (1997)
  • [2] Rao Y J., In-fibre Bragg grating sensors, Measurement Science and Technology, 8, 4, pp. 355-375, (1997)
  • [3] Liu Hui, Zhai Weilian, Li Gongbiao, Et al., The application of structural damage detection based on optic fiber Bragg grating sensing system, Journal of Basic Science and Engineering, 17, 3, pp. 395-401, (2009)
  • [4] Wei Heming, Zhang Pinglei, Cui Yanjun, Et al., Monitoring and evaluation of corrosion-induced expansion in the reinforced concrete structures: the applications of fiber optic low coherent strain sensors, Journal of Basic Science and Engineering, 22, 3, pp. 556-565, (2014)
  • [5] Zhu Honghu, Yin Jianhua, Jin Wei, Et al., Health monitoring of foundations using fiber Bragg grating sensing technology, China Civil Engineering Journal, 43, 6, pp. 109-115, (2010)
  • [6] Li Hongnan, Ren Liang, Fiber Bragg grating sensing technology for structural health monitoring, (2008)
  • [7] Lu Shaowei, Xie Huaiqin, Research of online monitoring technique for CFRP-strengthened RC beams with embedded fiber bragg gratting sensors, Journal of Basic Science and Engineering, 15, 3, pp. 387-395, (2007)
  • [8] Majumder M, Gangopadhyay K T, Chakraborty A K, Et al., Fibre Bragg gratings in structural health monitoring: present status and applications, Sensors and Actuators A: Physical, 147, 1, pp. 150-164, (2008)
  • [9] Lv Xilin, Reinforcement design of building structure, (2001)
  • [10] Xu M G, Archambault J L, Reekie L, Et al., Discrimination between strain and temperature effects using dual-wavelength fibre grating sensors, Electronics Letters, 30, 13, pp. 1085-1087, (1994)
123