NOR-FROST: A near-surface test site for fibre optic sensing

We present Nor-FROST, the NORwegian FibRe Optic Sensing Test site in the backyard at NORSAR!

3 parallel trenches of 30m length and 1m depth are filled with concrete, gravel, and sand respectively. Various fiber cables from different vendors have been laid out in 3 depths in each trench.

With this site in place, we will be able to do fundamental research on DAS, DSS, and DTS fiber sensing technology, such as transfer functions. We can compare and calibrate different fibers and interrogators. Furthermore, repeat measurements will give a time series for near-surface effects throughout the seasons.