Analysis and research on stress sensing characteristics of surface mounted mining FBG sensors
This paper focuses on the analysis and research of the stress sensing characteristics of surface-mounted mining fiber Bragg grating(FBG)sensors.It systematically analyzes how the stress sensing characteristics of the surface-mounted FBG sensor are influenced by the shear modulus of the substrate.A theoretical analysis model for the strain of a three-layer structure of surface-mounted fiber grating is established,and the mathematical expression for the strain transfer of surface-mounted fiber grating is derived.The stress sensing characteristics of the mining FBG sensor are analyzed from the perspective of the substrate's shear modulus.Through experimental analysis and summary,it was found that the copper substrate material has the best linear relationship between strain and wavelength,reaching99.89%.The higher the shear modulus of the surface mounted fiber optic grating substrate,the better the linearity between stress and wavelength.This provides a theoretical research basis for the structural design and sensitivity optimization of mining FBG sensors.
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