Abstract

We are developing a high-speed laser measurement system of tunnel concrete wall with the purpose of automating the maintenance of civil infrastructures. For the automated diagnosis in a road tunnel, it is essential to realize remote measurement from the traveling vehicle so that measurement can implement without closing the tunnel. Although standards vary depending on the country, specifically, in Japan, the running speed of the vehicle is 30 km/h or more, and resolution capable of reliably detecting cracks with a width of 200 μm is required. A vehicle-mounted type tunnel measurement system with sufficient resolution has not been established. Various remote measurements based on LIDAR technology are expected to be useful for the tunnel measurement. However, it is difficult to achieve high resolution of 200 μm, due to the short exposure time associated with high-speed traveling. The spatial resolution of the existing vehicle-mounted measurement system is 1 mm in imaging, 5 cm in ranging [1].

© 2019 IEEE

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