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Sensors 2016, 16(9), 1417; doi:10.3390/s16091417

Using Custom Fiber Bragg Grating-Based Sensors to Monitor Artificial Landslides

1
College of Defense Engineering, PLA University of Science and Technology, Nanjing 210007, China
2
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Nanjing 210007, China
3
College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Author to whom correspondence should be addressed.
Academic Editor: Christophe Caucheteur
Received: 20 June 2016 / Revised: 6 August 2016 / Accepted: 8 August 2016 / Published: 2 September 2016
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing)
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Abstract

Four custom fiber Bragg grating (FBG)-based sensors are developed to monitor an artificial landslide located in Nanjing, China. The sensors are composed of a rod and two FBGs. Based on the strength of the rods, two sensors are referred to as “hard sensors” (Sensor 1 and Sensor 2), the other two are referred to as “soft sensors” (Sensor 3 and Sensor 4). The two FBGs are fixed on each sensor rod at distances of 50 cm and 100 cm from the top of the rod (an upper FBG and a lower FBG). In the experiment presented in this paper, the sensors are installed on a slope on which an artificial landslide is generated through both machine-based and manual excavation. The fiber sensing system consists of the four custom FBG-based sensors, optical fiber, a static fiber grating demodulation instrument (SM125), and a PC with the necessary software. Experimental data was collected in the presence of an artificial landslide, and the results show that the lower FBGs are more sensitive than the upper FBGs for all four of the custom sensors. It was also found that Sensor 2 and Sensor 4 are more capable of monitoring small-scale landslides than Sensor 1 and Sensor 3, and this is mainly due to their placement location with respect to the landslide. The stronger rods used in the hard sensors make them more adaptable to the harsh environments of large landslides. Thus, hard sensors should be fixed near the landslide, while soft sensors should be placed farther away from the landslide. In addition, a clear tendency of strain variation can be detected by the soft sensors, which can be used to predict landslides and raise a hazard alarm. View Full-Text
Keywords: artificial landslide; FBG; sensors; monitor artificial landslide; FBG; sensors; monitor
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Zhang, Q.; Wang, Y.; Sun, Y.; Gao, L.; Zhang, Z.; Zhang, W.; Zhao, P.; Yue, Y. Using Custom Fiber Bragg Grating-Based Sensors to Monitor Artificial Landslides. Sensors 2016, 16, 1417.

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