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Tunnel integrity inspection vehicle: evaluation of 'Gridlight' (LR-IMS-009)

Last updated on 13 August 2014 10:39

Gridlight is an optical instrument designed for detecting bulges and other distortions on surfaces, particularly in tunnels. It is described in reference 1. It consists of a light projector which projects a grid of parallel lines onto the tunnel wall, in the haunch area for example, and any lining distortion...

Author(s): Fletcher G.E.

Organisation(s): British Rail Research ;

1992

United Kingdom

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