Chinese engineers have found a clever new use for the Raspberry Pi: detecting voids in the linings of railway tunnels. By embedding wires in the secondary lining of a recently built 600-meter tunnel and connecting them to the Raspberry Pi’s GPIO pins, they can measure the conductivity of the concrete. If the circuit remains open, indicating an empty void, the Raspberry Pi detects no current flow. When the circuit is closed, indicating a filled void, the current flows through, and the Raspberry Pi registers this as a completed grouting process. This innovative approach allows for early detection of potential structural issues in tunnels, helping to ensure their safety and longevity.
* www.theregister.com/2024/10/29/china_raspberry_pi_tunnel_testing/
* www.theregister.com/2024/10/29/china_raspberry_pi_tunnel_testing/