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Making Tunnels Safer

Basler pilot GigE Cameras Reliably Detect Cracks in Tunnels

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. The engineering company, terra international surveys ltd., located in Zurich, Switzerland, developed tCrack - a novel technical solution, an automated and systematic tunnel inspection approach with complete documentation. tCrack combines digital high-resolution Basler pilot cameras with absolute, kinematic positioning technology.

The system is being used successfully in the famous Swiss Gotthard Base Tunnel, and has proven itself to be very reliable in tunnels of up to 25 km in length – it accurately detects, classifies and documents cracks within predefined tolerances.

The tCrack system includes ten Basler pilot cameras mounted on a site vehicle such as a locomotive in tracked tunnels or on a cart in tunnels without railway tracks. All ten cameras capture images simultaneously and are controlled by a central computer which is also mounted on the vehicle.

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