Influence of adhesive on surface-bonded FBG sensor strain transfer coefficient

Fiber bragg grating (FBG) sensor is usually pasted on the substrate to measure the surface strain, so it can achieve the compatibility of deformation. But different adhesive show various property on different substrate, thus influence the strain measurement result. In response to this problem, an experiment was conducted to simply the strain transfer model. The strain result measured by FBG sensor pasted on the beam of uniform strength and the standard resin specimen was compared. The results show that the greater the shear strength of the adhesive on the substrate, the strain transfer coefficient of surface-bonded FBG sensor is better.