High quality images of tunnel surfaces are necessary for visual judgment of abnormal parts. Hence, we propose a monitoring system from a vehicle, which is motion-blur-compensated by the back and forth motion of a galvanometer mirror to offset the vehicle speed, prolong exposure time, and take sharp images including detailed textures. As experimental result of the vehicle-mounted system, we confirmed significant improvements in image quality for a few millimeter-sized ordered black-and-white stripes and cracks, by means of motion blur compensation and prolonged exposure time, under the maximum speed allowed in Japan in a standard tunnel of a highway.
Tomohiko Hayakawa and Masatoshi Ishikawa, "Motion-blur-compensated structural health monitoring system for tunnels at a speed of 100 km/h," Proc. SPIE 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017, 101692G (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 30, 2017; Published: 19 April 2017); https://doi.org/10.1117/12.2259780.
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