Landslide monitoring based on high-resolution distributed fiber optic stress sensor

We present a landslide monitoring application using a high-resolution distributed fiber optic stress sensor. The sensor is used to monitor the intra-stress distribution and variations in landslide bodies, and can be used for the early warning of the occurrence of the landslides. The principle of distributed fiber optic stress sensing and the intra-stress monitoring method for landslides were described in detail in this paper. By measuring the distributed polarization mode coupling in the polarization-maintaining fiber, the distributed fiber stress sensor with stress measuring range 0-15 Mpa, spatial resolution 10 cm and measuring range 0.5 km, was designed. The warning system was also investigated experimentally in the field trial.