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Analysis on strain transfer of a pasted FBG strain sensor
Authors:Rujun Wu  Bailin Zheng  Zhigang Liu  Pengfei He  Yuegang Tan
Institution:1. Institute of Applied Mechanics, Tongji University, Shanghai 200092, China;2. Mechanic and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China
Abstract:Optical fiber is not in direct contact with the material host in practice, so the strain measured by the Fiber-optic Bragg Grating (FBG) sensor is not the true strain. The transfer mechanism between the measured strain and the true strain depends on mechanical properties of fiber, protective layer, substrate, adhesive layer, and the material host. This paper analyzes the transfer mechanism of strain in detail, and proposes the shear stress distribution of polynomial form, and establishes the transfer function of strain. This paper also analyzes the influence on length of FBG sensor, adhesive layer thickness and elastic modulus on strain transfer coefficient in detail. The theoretical guidance for the practical application of the FBG sensor is given through the strain transfer analysis.
Keywords:Strain transfer  Fiber-optic Bragg Grating  FEM  Measuring accuracy
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