TDR for landslide measurements

The use of the TDR (Time Domain Reflectometry) technique for monitoring landslides is relatively recent, but already has numerous application examples.

It is based on the deformation of coaxial cables cemented into the ground affected by the movement.

The deformation of the cable causes the dielectric contained in it to be crushed, causing a change in impedance.

The measurement control unit sends an electrical pulse along the cable, monitoring the return signal.

The distance of the break from the meter is proportional to the time it takes for the signal to travel back and forth after it has been reflected.

TDR cables of different diameters are available.

They are equipped with a seal on the distal part and a connector (for surface connection) towards the reading unit.