Evaluation of thermal-drift effect on strain measurement of energy pile
Evaluation of thermal-drift effect on strain measurement of energy pile
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DOI：
10.1016/j.conbuildmat.2022.129663
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发表时间：
2022
影响因子：
7.4
通讯作者：
包小华
中科院分区：
文献类型：
--
作者：
肖雄;黎海星;崔宏志;包小华
Fiber Bragg grating (FBG) strain sensors and electrical resistance strain (ERS) gauges are typically utilized to monitor the internal deformation of buildings. However, a common problem inherent in these sensors is the unwanted thermal output in the measurement results. This study investigated factors influencing the thermal drift of FBG strain sensors and ERS gauge measurements using a series of calibration experiments. The results demonstrate that the relative error caused by the thermal output of the heated connection cables was as high as 90%. A correction method for the thermal output of the cables was also proposed. This correction method reduced the relative difference between the bonded ERS gauge and FBG sensor strain readings from 82.6% to around 10-20%. Finally, FBG strain sensors and ERS gauges were employed to monitor the strain of the energy piles under cooling and heating cycles. The difference between the corrected FBG strain sensor and ERS gauge readings was less than ±10%. The experimental results also reveal that the measurement stability of the FBG strain sensor was higher than the ERS gauges.
