ViSP (Visually Servoed Paired structured light system) for measuring structural displacement

To inspect structural conditions, structural displacement is needed to be monitored at any time. Therefore, our previous study proposed a ViSP (Visually Servoed Paired structured light system) which is composed of two sides facing with each other, each with a camera, a screen, and one or two lasers controlled by a 2-DOF manipulator. In this system, the relative translational and rotational displacement between two sides can be estimated by calculating positions of the projected laser beams on the screens and the rotation angles of the manipulators. To validate the performance of the system, the various experimental tests with a two-story structural model were performed. The estimated results were compared with the results from a laser displacement sensor which can be considered as a reference. The results show that the presented system has potential of estimating the response of the structures with high accuracy in real time.