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Interface transferring mechanism and error modification of embedded FBG strain sensors |
| ZHOU Zhi, LI Jilong, OU Jinping |
| School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; |
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Abstract As the strain sensing element of a structural health monitoring, the study and the application of the fibre-optic bragg grating (FBG) have been widely accepted. The accuracy of the FBG sensor is highly dependent on the physical and the mechanical properties of the strain interface transferring characteristics among the layers of bare optical fibre, protective coating, adhesive layer and host material. In this paper, firstly, the general expression of the multilayer interface strain transferring mechanism is derived. Secondly, based on the defined average strain, the error-modified equation of the FBG sensor is obtained. Finally, in the light of the embedded tube-packaged FBG and the fibre reinforced polymer-optical fibre bragg grating (FRP-OFBG) strain sensors, developed in the Harbin Institute of Technology (HIT), the corresponding strain transferring laws have been studied, and the corresponding error modification coefficients have also been given, which are validated by experiments. The research results provide theories for the development and application of the embedded FBG sensors.
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Issue Date: 05 March 2007
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