Measurement Accuracy Analysis of Distributed Fiber Optic Sensors for Asphalt Mixture Based on the DEM-FDM Coupled Method

Distributed fiber optic sensors (DFOSs) have been effectively used for pavement health monitoring. However, the inhomogeneity of asphalt mixture and characteristics sensor affect measurement accuracy, which in turn affects performance evaluation pavement. In this study, strain nonembedded DFOS specimens was as a reference compared with embedded to analyze accuracy based on four-point bending test. To further improve numerical simulation model established by coupling discrete element method (DEM) finite difference (FDM), feasibility verified comparing it load-displacement curves obtained from laboratory tests. The results tests simulations showed linear relationship between strain. Therefore, correction proposed DEM-FDM method, coefficient index. addition, an orthogonal test performed influence design parameters, including elastic modulus, section height, width, DFOS. Through variance range analysis, found that modulus has significant effect followed height width. summary, study efficient suitable application pavements considering material sensor.