Measurement for monitoring, probing and recording evidence - Tunnel Engineering: Basics and Additional Services for Design and Construction - page 161

possible to alter the geometry of the inner lining and save concrete. Fig. 4-28 shows an
example of an image of a shotcrete layer recorded by the tunnel scanner.
Further applications ensue from the comparison of various images, for example a shot-
crete support layer can be imaged at various time and the deformations can be deduced or
the layer thickness can be determined [254].
Figure 4-27 Photogrammetric tunnel scanner (DIBIT) [25].
Figure 4-28 Image of a shotcrete layer [25].