Tunnel Inspection System


The ESIM Tunnel Inspection System is designed to measure the internal profi le of the railway tunnels and the cant defi ciency. Its versatility allows installation on various kind of rolling stock. It is based on laser flight time technology and the opto-electronic sensors allow an accurate reconstruction of the tunnel through the acquisition of a large number of cross sections.
The number of sections depends by transit speed of rolling stock of measurement, while the data localization is guaranteed by an integrated odometry system.
In the next fi gure is shown a simulated sequence of acquisitions for the three dimensional reconstructions: the distance between two sections is equidistant only in the case of uniform speed.
The measurement are automatically stored in a database (unit of archive) which can be analyzed through the post-elaboration software.


The ESIM Tunnel Inspection System is based on many innovative features and the fi rst of these is the flight time laser technology.
The system allows to do cross measurements of gauge structure related to the center of the rolling plan. An inertial platform provides necessary measurements to parameters evaluation of the raised part of the rail. The system has an optional video camera for an immediate visual response of potential obstacles noticed by sensor laser.
All measurements, both related to the raised part and to the gauge structure are synchronized to the rail track km signal provided by an integrated odometry system.
The post-elaboration software allows the review of whole acquisition just to every single profile control.
Graphic functions allow the calculation of distances between the gauge structure points and of the section.
The software allows the choice between different gauge structures standard and integration of special outline.


Monitoring railway tunnels shake in order to:

  • Minimize the risk of impact between rolling stock and tunnels;
  • Keep a check on tunnels structural collapse;
  • Monitoring and spatial identifi cation of cracks;
  • Store captured data.


TInS installation system considers the low invasiveness on diagnostic rolling stock.
Indeed, installation consists on fi xing a metallic box on the front or the back of the coach; it contains the inertial laser system, with small size, so, the anchorage on the coach does not cause any alteration of its limit outline. The mounted box height must not exceed of 1 meter from the iron flat, after the identifi cation of the installation side.
Following this expedient the system will be able to measure also the distance of both rails, to have a fixed reference of each acquired tunnel profile.
The high range of measurement of the optical sensor allows the diagnosis of every tunnel type: single track tunnel, double track tunnel, up to highest tunnel.