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  Use of 3D Scanning Technology for Automated Inspection of Tunnels

  Significant advances in high-speed 3D imaging technology have been made in the last decade and there are now commercial, off-the-shelf, solutions for automatically evaluating infrastructure condition at high-speed. One such device is the Laser Tunnel Scanning System (LTSS) developed by Pavemetrics; a “spin-off” of the National Optics Institute of Canada. The LTSS system utilizes high-speed cameras, custom optics and laser line projectors to acquire both 2D images, and high-resolution 3D profiles, of infrastructure surfaces at speeds up to 100 km/h. 3D scanners of this sort offer numerous advantages to traditional manual inspection methods. This presentation will explore the application of 3D laser scanning technology to the activity of tunnel inspection. The discussion will include a discussion of the practical achievable levels of data precision and accuracy obtained during testing the Guadarrama and Regajal rail tunnels in Spain.

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