Paired vision-based structural health monitoring system

In the previous study, a paired structured light-based deformation measurement system which incorporates lasers, cameras, and screens was proposed and experimental tests validated the potential of the proposed system. However, the experimental tests were limited to the relatively short distance and the estimation was based on an assumption that there is no initial deformation. In this study, a calibration of the initial offset is performed from the first vision scene, and then the deformation based on the initial position is estimated. The dynamic deformation estimation tests at a longer distance are performed to prove the scalability of the proposed system. These experimental results show that the proposed paired structured light system can successfully estimate the relative deformation and can be applied to the large civil infra-structures such as long-span bridges or high-rise buildings.