Abstract
The proposed transfer mechanism theories of FBG strain sensor rarely involve influence of curvature of the measured object which is an important parameter in the field of material strength. This paper analyzes the strain transfer mechanism of FBG radian strain sensor between curved plane and plane, proposes the stress distribution, and obtains that the influential parameters of strain transfer are FBG strain sensor length, measured object curvature and adhesive layer thickness. Meanwhile, influence of the stress distribution on FBG reflectance spectrum is also analyzed. Further, calibration model is carried out on one FBG radian strain sensor to analyze the influential parameters. Through the influential parameter's analyses, the practice guidance for FBG radian strain sensor which have highly significant in improving the curvature detection accuracy is given.
Highlights
Due to its overwhelming advantages, such as high sensitivity, light weight, immunity to electromagnetic interference, remote sensing, multiplexing capability and so on, fiber Bragg grating (FBG) sensors have been successfully used in the measurement of temperature [1], pressure [2], current [3], strain [4,5], magnetic field [6], angle [7], and so on.One of the most important application forms of FBG sensors is strain measurement [8]
Based on above discussion and analysis, this paper focuses on the strain transfer mechanism of FBG radian strain sensor which can achieve curvature measurement between curved plane and plane and analyzes the influential parameters on strain transfer coefficient between FBG radian strain sensor and measured object
The strain transfer coefficient, its max value and average are smaller with the adhesive thickness getting bigger
Summary
Due to its overwhelming advantages, such as high sensitivity, light weight, immunity to electromagnetic interference, remote sensing, multiplexing capability and so on, fiber Bragg grating (FBG) sensors have been successfully used in the measurement of temperature [1], pressure [2], current [3], strain [4,5], magnetic field [6], angle [7], and so on.One of the most important application forms of FBG sensors is strain measurement [8]. Through analyses of stress distribution and strain transfer model, the parameters which influence the strain transfer coefficient are FBG radian strain sensor length, measured object curvature and adhesive layer thickness. In order to verify the strain transfer mechanism model, one FBG radian strain sensor model is established to calculate the strain transfer coefficient with the changes of length of FBG radian strain sensor, measured object curvature and adhesive thickness.
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