Three-dimensional imaging laser scanner for the inspection of tunnels

Richard Wissler; Christoph Froehlich

doi:10.1117/12.196115

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23 November 1994 Three-dimensional imaging laser scanner for the inspection of tunnels

Richard Wissler, Christoph Froehlich

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Proceedings Volume 2249, Automated 3D and 2D Vision; (1994) https://doi.org/10.1117/12.196115
Event: Optics for Productivity in Manufacturing, 1994, Frankfurt, Germany

Abstract

Tunnel constructions need regular safety checks. The measurement of the cross-sectional profile in relation to the actual track position is of particular importance in the surveys. It allows to monitor the observation of the required clearance gauge. Profile measurements inside Tunnels are also needed to determine suitable clearance for consignments exceeding the loading gauge. The deployment of vehicles with larger cross sections, e.g. double-decker carriages, means that clearances get tighter. This also means that demand made on technical surveying and measuring systems are becoming more stringent. Amberg Measuring Technique have developed an optical scanner for special use in tunnel surveys. The actual scanning device is a rotating mirror with scanning angle of full 360 degree(s) that allows the entire surrounding to be scanned without breaks in one test run. At each revolution of the scanning mirror, a cross-sectional tunnel profile, represented by 2500 distance values is recorded. Together with the profile data, the intensity of the reflected light is also recorded, representing a grey scale value for the surface brightness. High rotational speed of the scanning mirror allows rapid recording. The recording duration for 1 km of tunnel is about 10 minutes. The data are stored in digital form for subsequent processing on a computer workstation.

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Richard Wissler and Christoph Froehlich "Three-dimensional imaging laser scanner for the inspection of tunnels", Proc. SPIE 2249, Automated 3D and 2D Vision, (23 November 1994); https://doi.org/10.1117/12.196115

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