Spacetec Datengewinnung GmbH has carried out measurements all over the world with the TS3 tunnel scanner, and the methods from Spacetec is now part of the periodic inspection in several well-known Metro systems (Paris etc.) and other tunnel portfolios.
The tunnel scanner uses three simultaneous recording channels and generates an image recording of the tunnel surface, a thermographic image and a three-dimensional measurement survey, allowing the computer-based combination and opening up a wide variety of different analysis options.
To maximise the thermal imaging results, the scanning has to be carried out in conditions that give the best differences in temperature in the tunnel. The thermographic images will show up weak points in the thermal insulation by way of "temperature anomalies".
The all-round angle of vision delivers a complete recording of the entire surface of the object in a single recording scan. A resolution of 10,000 pixels at 360° for all three recording channels, give the opportunity for an exact crack identification, as well.
As part of the process the software plays an important part in a tunnel inspection. Spacetec offers a software that combines digital processes for capturing and processing information. A tool which makes the work easier and more efficient for the on site engineers during inspections and rehabilitation.
Before the inspection is made, the scanner recordings of the areas to be inspected are screened. The data obtained in earlier inspections are also available and compared. The viewing shows conspicuous points and areas which must be inspected on site. These points and areas are then marked on the screen and entered in a computer checklist for easy localisation during the on-site physical inspection.