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Signal linearization, for tunnel surface image display to the correct scale in all directions. This enables measurement of exact length of cracks, etc. Image analysis with tools such as zoom, surface area and distance calculations. This enables to detect any possible anomalies, to report them, to plan repairs and evaluate their cost, to keep a record. The software selected information is analysed by specialists who compare the various images with the actual drawings or refer- ence images from the computer library. This way, the mainte-nance team can detect cracks or water infiltration and follow their evolution by comparing images taken at various intervals.
Scanner head utility connections

Catalog - 7666 TECHNICAL DATA

Scanner for visible and infrared spectral bands Acquisition angle : 270
° Sensor/tunnel wall distance at full resolution : 1.2 to 6 m Traveling speed at full resolution : 0 to 5 km/h Digital dynamic range : 12 bits / 4096 levels Protection class : IP 63 Dimensions : 600 X 300 X 155 mm Weight : 30 kg
Visible channel 3B class laser diode up to 2 m distance, 3A class beyond Laser power : 30 mW Wave length : 660 nm Head rotation speed (scanning rate) : 16 800 rpm (280 Hz) Illuminating spot size : 5 mm dia. Spatial resolution : Detection of cracks smaller than 0.1 mm at 6 m distance when contrast against background is higher than 30%
Infrared channel Instantaneous field of view : 2 mrad Thermal sensitivity : 0.02
° C at 20
° C Head rotation speed (scanning rate) : 4 200 rpm (70 Hz)
Tunnel Profile Plotting The instruction makes a rough measurement of the wall distances for comparison with several pre-established tunnel network profiles, enabling selection of the actual tunnel profile.
Above information is subject to changes without notice