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Appl. Sci. 2017, 7(7), 699; doi:10.3390/app7070699

An Energy Demodulation Based Fiber Optic Sensing System for Landslide Early-Warning

1
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
2
Suzhou Nanzee Sensing Technology Co., Ltd., Suzhou 215123, China
3
Department of Civil and Environmental Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Christoph Peter Hauri
Received: 24 March 2017 / Revised: 5 June 2017 / Accepted: 9 June 2017 / Published: 7 July 2017
(This article belongs to the Special Issue Distributed Optical Fiber Sensors)
View Full-Text   |   Download PDF [3656 KB, uploaded 7 July 2017]   |  

Abstract

To help reduce the impact of geo-hazards, an innovative landslide early-warning technology based on an energy demodulation-based fiber optic sensing (FOS-LW for short) technology, is introduced in this paper. FOS-LW measures the energy change in a sensing fiber at the segment of micro-bending, which can be caused by landslide movements, and automatically raises an alarm as soon as the measured signal intensity in the fiber reaches a pre-set threshold. Based on the sensing of micro-bending losses in the fiber optics, a two-event sensing algorithm has been developed for the landslide early-warning. The feasibility of the FOS-LW technology is verified through laboratory simulation and field tests. The result shows that FOS-LW has some unique features—such as the graded alarm, real-time responses, remote monitoring, low cost and passive optical network—and can be applied in the early-warning of landslides. View Full-Text
Keywords: landslides; fiber optic sensing system; early-warning; energy demodulation; event sensor landslides; fiber optic sensing system; early-warning; energy demodulation; event sensor
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Wang, X.; Shi, B.; Wei, G.; Chen, S. An Energy Demodulation Based Fiber Optic Sensing System for Landslide Early-Warning. Appl. Sci. 2017, 7, 699.

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