Tunnel Profile Monitoring System

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The system involves a series of linked rods, fixed to a tunnel wall to monitor deformation.

A datalogging system and related software is available to provide near real time displacement and generate a graphical representation of tunnel performance.

For monitoring:

Underground openings during construction for control and safety
Tunnel deformation due to nearby construction
Long-term deformation and performance of existing tunnels


  • Low profile design with multiple arms to fit close to tunnel wall
  • Does not interfere with tunnel traffic
  • High system accuracy of up to 0.02mm of deformation
  • Custom engineered to suit each individual application
  • Immune to air density problems inherent in optical systems
  • Direct measurement of displacement rather than calculation from tilt measurement