Basler GigE cameras help inspect train tunnel in Switzerland

he engineering company, terra international surveys ltd., is located in Zurich, Switzerland. They have vast experience in civil engineering, hydrography, digital photogrammetry, GPS surveying and cadastral surveying.

In order to assure tunnel safety, tunnels need to be inspected on a regular basis to detect and document defects (cracks, scales, spalls, corrosion, etc.) at an early stage. This has often been done by using traditional procedures such as manual recording from mobile scaffolding. But these methods can only file cracks that have been detected visually by the people inspecting the tunnel surface. This procedure is time-consuming, labor-intensive and subject to a high degree of interpretation. It was time to develop a novel technical solution, an automated and systematic tunnel inspection approach with complete documentation.

In order to economically survey tunnels, terra developed a novel tunnel inspection system called tCrack and the necessary software for evaluating the captured data. It combines digital ...more