Research on high-resolution distributed fiber optic stress sensor for landslide monitoring

In this paper, an early warning monitoring system for landslides, based on high spatial resolution distributed fiber optic stress sensing and monitoring the intra-stress distribution and changes in landslide bodies, was first presented. The principle of distributed fiber optic stress sensing and the monitoring method for landslides were described in detail. Through measuring the distributed polarization mode coupling in the polarization-maintaining fiber, the distributed fiber stress sensor with stress measuring range 0-15Mpa, 10cm spatial resolutions and measuring range 0.5km, was designed. The warning system was investigated in detail through the field test also.