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Fiber Bragg Grating Sensing Technology in Landslide Monitoring

Author: ChenLingJun
Tutor: ZhangYanJun
School: Yanshan University
Course: Microelectronics and Solid State Electronics
Keywords: Fiber Bragg grating Demodulation system Landslide monitoring FPGA ANSYS
CLC: TP212.14
Type: Master's thesis
Year: 2010
Downloads: 236
Quote: 1
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Abstract


The landslide is a common natural disasters in the engineering geological problems , particularly common in the mountains and valley . Many important factories and residential areas built near the landslide , debris flow landslides caused by the collapse of the mountain and after a heavy rainstorm often cause serious damage to the national development and people's lives and property . As a precaution , it is necessary to monitor the landslide , landslide hazards early warning . Fiber Bragg grating sensors in recent years, research in the field of optical fiber sensing technology hot spots, many advanced nature is superior to conventional sensors , is a strong contender for stress and temperature measurement . The fiber grating stress monitoring system is based on the FBG sensors sensing system , the system has been widely used in the petrochemical, power, metallurgy , construction , transportation and other sectors of the domestic . First , the paper analyzes the characteristics of the basic theory of fiber grating , the reflective properties of the fiber grating , axial stress and temperature characteristics, the analysis using matlab . The fiber grating demodulation method . Landslide monitoring system ultimately chose fiber FP tunable filter demodulation . Secondly , the study of the formation and characteristics of landslides , landslide stability analysis using ANSYS determine the landslide unsafe point , the point of insecurity as a distributed fiber Bragg grating sensor monitoring laid points , monitoring of landslide . Finally, the design of the optical fiber grating landslide monitoring system , the system can be monitored in real time and recorded a landslide unsafe point stress , deformation prediction may cause a landslide parts , the alarm can be issued prior to the landslide . And through the fiber grating pure bending beam experiments prove that the fiber grating sensors are suitable for landslide monitoring .

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