TY - JOUR
T1 - Novel fiber Bragg Grating-based strain gauges for monitoring dynamic responses of Celtis sinensis under typhoon conditions
AU - Wu, Pei Chen
AU - Tan, Dao Yuan
AU - Chen, Wen Bo
AU - Malik, Numan
AU - Yin, Jian Hua
N1 - Funding Information:
The work in this paper is supported by the Development Bureau of Hong Kong SAR Government, a Research Impact Fund (RIF) project (R5037-18), a Theme-based Research Scheme Fund (TRS) project (T22-502/18-R), and three General Research Fund (GRF) projects (PolyU 152209/17E; PolyU 152179/18E; PolyU 152130/19E;) from Research Grants Council (RGC) of Hong Kong SAR. The authors also acknowledge the financial supports from Research Institute for Sustainable Urban Development of The Hong Kong Polytechnic University and three grants (BBAG, ZDBS, ZVNC) from The Hong Kong Polytechnic University.
Publisher Copyright:
© 2021
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/2
Y1 - 2021/2
N2 - In recent decades, conventional electric instruments have been widely adopted to monitor rupture failure of trees by measuring the longitudinal strains of tree trunks. However, the good measurement accuracy is compromised by the significant difference in stiffness of the sensing element and tree trunks. Besides, the reliability of electric instruments under harsh environments, especially extreme weathers, such as thunderstorms and typhoons, is also doubtful. In this study, a novel strain gauge based on fiber Bragg grating (FBG) sensing technology was developed specifically for measuring the strain distribution of tree trunks under static or dynamic loading. The main principle of the design of the strain gauges is presented in detail. The laboratory calibration proves that the FBG-based strain gauges in polyoxymethylene (POM) and polylactic acid (PLA) backings show a better performance than those made of metal. To test the performance of this novel FBG-based strain gauge, a set of transducers were installed at different heights of a Celtis sinensis. Firstly, a pull test on this tree trunk was conducted to validate the good performance of the novel strain gauge when the tree is subjected to static loading. Secondly, the good dynamic performance of the novel strain gauge is proved by successfully recording the dynamic motion of a tree trunk during a typhoon. Furthermore, a monitor system relied on the FBG-based strain gauges is conceived to assess the resilience of urban ecosystems formed by trees to extreme weather events.
AB - In recent decades, conventional electric instruments have been widely adopted to monitor rupture failure of trees by measuring the longitudinal strains of tree trunks. However, the good measurement accuracy is compromised by the significant difference in stiffness of the sensing element and tree trunks. Besides, the reliability of electric instruments under harsh environments, especially extreme weathers, such as thunderstorms and typhoons, is also doubtful. In this study, a novel strain gauge based on fiber Bragg grating (FBG) sensing technology was developed specifically for measuring the strain distribution of tree trunks under static or dynamic loading. The main principle of the design of the strain gauges is presented in detail. The laboratory calibration proves that the FBG-based strain gauges in polyoxymethylene (POM) and polylactic acid (PLA) backings show a better performance than those made of metal. To test the performance of this novel FBG-based strain gauge, a set of transducers were installed at different heights of a Celtis sinensis. Firstly, a pull test on this tree trunk was conducted to validate the good performance of the novel strain gauge when the tree is subjected to static loading. Secondly, the good dynamic performance of the novel strain gauge is proved by successfully recording the dynamic motion of a tree trunk during a typhoon. Furthermore, a monitor system relied on the FBG-based strain gauges is conceived to assess the resilience of urban ecosystems formed by trees to extreme weather events.
KW - Optical fiber sensing
KW - Strain measurement
KW - Tree monitoring
KW - Typhoon
UR - http://www.scopus.com/inward/record.url?scp=85099265487&partnerID=8YFLogxK
U2 - 10.1016/j.measurement.2021.108966
DO - 10.1016/j.measurement.2021.108966
M3 - Journal article
AN - SCOPUS:85099265487
SN - 0263-2241
VL - 172
JO - Measurement: Journal of the International Measurement Confederation
JF - Measurement: Journal of the International Measurement Confederation
M1 - 108966
ER -