To help reduce the impact of geo-hazards, an innovative landslide early-warning\ntechnology based on an energy demodulation-based fiber optic sensing (FOS-LWfor short) technology,\nis introduced in this paper. FOS-LW measures the energy change in a sensing fiber at the segment of\nmicro-bending, which can be caused by landslide movements, and automatically raises an alarm as\nsoon as the measured signal intensity in the fiber reaches a pre-set threshold. Based on the sensing\nof micro-bending losses in the fiber optics, a two-event sensing algorithm has been developed for\nthe landslide early-warning. The feasibility of the FOS-LW technology is verified through laboratory\nsimulation and field tests. The result shows that FOS-LW has some unique featuresââ?¬â?such as\nthe graded alarm, real-time responses, remote monitoring, low cost and passive optical networkââ?¬â?and\ncan be applied in the early-warning of landslides.
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