The borehole deformation system is based on the Fibre Bragg Grating technology and is designed to monitor the deformation in the longitudinal direction of a borehole.

Within the borehole, different fixation points can be realized at well defined positions by using special borehole anchors. Furthermore, a strain cable (see SC-01) is connected between each anchoring point and a metal head plate fixed at the entrance of the borehole. In this way, the displacement of each anchoring point relative to the entrance point of the borehole can be measured. Furthermore, a temperature cable can be inserted to measure the temperature distribution inside the borehole.

• Measurement of axial displacements in boreholes for up to 6 different anchoring points.
• Draw Tower Gratings (DTGs) are used ensuring high fiber strength
• Temperature cross-sensitive: when large temperature variations are expected, a temperature chain can be inserted for compensation purposes.