The RGB or intensity information of the photogrammetric point clouds, even based on a low-cost smartphone camera, contain the targeted cracks. The point cloud from the chosen laser scanner is not sufficient for the required crack width even at a low speed of 1 m/s. The results of the data acquisition with the different sensors are point clouds, which make the results comparable. The used test object is a blasted concrete plate, sized 70 cm × 70 cm × 5 cm and placed in an outdoor environment. In this pre-study, different sensors, like different camera systems for photogrammetry, a laser scanner, and a laser triangulation system are evaluated for crack detection based on a defined required minimum crack width of 0.2 mm. In recent projects, the authors are developing automated crack detection systems to support the inspector. Nowadays, this monitoring is made manually by visual inspection. Bridges are one of the most critical traffic infrastructure objects, therefore it is necessary to monitor them at regular intervals.
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February 2023
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