Application of Distributed Optical Fiber Sensing Technique in Monitoring the Ground Deformation

Liu, Jin; Long, Yi; Wei, Jihong; Kanungo, Debi Prasanna

doi:10.1155/2017/6310197

Cited by 20 publications

(16 citation statements)

References 14 publications

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“…This limited detection capability is indeed an intrinsic limitation of the proposed approach: the full potential of DOFSs is not exploited, as the sensor cable is intrinsically a concatenation of cumulative strain sensors acting as a long-range extensometer, and cracks in between two clamping points cannot be distinguished. Eventually, Liu et al [223] reported the application of BOTDA to monitor earth fissure in a real test site in Wuxi, China. The cable was installed in a 40 cm-depth trench and anchored to the ground to follow its deformation.…”

Section: Ground Subsidence and Earth Fissure Monitoringmentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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Featured Application: Distributed fibre optic sensors for geo-hydrological applications: a comprehensive review about methodology, weaknesses, and strengths.Abstract: Distributed optical fibre sensing, employing either Rayleigh, Raman, or Brillouin scattering, is the only physical-contact sensor technology capable of accurately estimating physical fields with spatial continuity along the fibre. This unique feature and the other features of standard optical fibre sensors (e.g., minimal invasiveness and lightweight, remote powering/interrogating capabilities) have for many years promoted the technology to be a promising candidate for geo-hydrological monitoring. Relentless research efforts are being undertaken to bring the technology to complete maturity through laboratory, physical models, and in-situ tests. The application of distributed optical fibre sensors to geo-hydrological monitoring is here reviewed and discussed, along with basic principles and main acquisition techniques. Among the many existing geo-hydrological processes, the emphasis is placed on those related to soil levees, slopes/landslide, and ground subsidence that constitute a significant percentage of current geohazards.

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Section: Ground Subsidence and Earth Fissure Monitoringmentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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“…Horiguchi and Tateda in 1989 [5] has introduced a new measurement technique to monitor light wave attenuation in optical fibre which they named it as Brillouin optical time-domain analysis (BOTDA). The concept of BOTDA is based on Stimulated Brillouin Scattering (SBS) in an optical fibre when two light waves; continuous light wave and pump pulse light wave in counter propagated direction are coupled and frequency difference between these two lights named the Brillouin frequency shift between the light waves is then matched to the Brillouin frequency of optical fibre core which dependence of strain and temperature variations [6] This characteristics has enabled a distributed sensing system that can provide a complete profile of strain distribution which an advantageous to civil engineering application.…”

Section: The Principle Of Distributed Optical Sensing Techniquementioning

confidence: 99%

Application of Brillouin-based distributed optical fibre sensing technology to measure strain development of a slope model

Salma

Azman

Hisham³

et al. 2018

MATEC Web Conf.

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For almost two decades, distributed optical fibre sensors are well-known for an alternative to conventional instrumentation in geotechnical engineering applications. However, the technology is yet to be fully implemented due to uncertainties of attachment method or the best way to deploy optical fibre for geo-structure health monitoring. Thus, a project of a 1g model of soil slope was intiated and was constructed with three layers of optical fibre that were horizontally embedded in the soil slope mass in order to observe strain development due to a surcharge load. The strain mobilizations were measured by using Brillouin Optical Time-Domain Analysis (BOTDA) sensing system during the incremental loading on the slope crest until a failure feature had been initiated. The aim of study is to evaluate the development of horizontal strains from Brillouin-based optical fibre sensor subjected to soil slope deformation which lead to slope failures. The results showed that the measurands of optical fibre were highly accumulated at the position of 0.3m depth from the slope crest. The development of high strain at this position was because of soil-fibre interaction to the overburden imposed load in perpendicular direction of optical fibre placement. Therefore, it can be concluded that the optical fibre strain in the soil-strain field were well-responded to the particle soil movement. In addition, the significant trend of positive strain curves were illustrated when the soil was under compression due to external load from a surcharge load plus self-weight of the soil material.

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“…In recent years, distributed optical fiber sensing technology has developed rapidly. It has been well applied in the civil engineering field, such as tunnels [3,4], bridges [5,6], railways [7], and foundations [8]. Compared with traditional electrical sensors, the distributed optical fiber sensors (DOFS) have unique advantages such as distributed measurement, chemical resistance, electromagnetic interference, and easy installation.…”

Section: Introductionmentioning

confidence: 99%

Horizontal Loading Performance of Offshore Wind Turbine Pile Foundation Based on DPP-BOTDA

Zhao-hui

Guan²,

et al. 2020

Applied Sciences

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Offshore wind power is becoming attractive in the wind-power field. With the rapid development of wind-power technology, high-power wind turbines have been implemented in practice. However, the increase in the length of the wind turbine blade causes the pile foundation to withstand a prone overturning moment. For overcoming the problems of traditional sensing technology and meeting the monitoring requirements of pile foundations, a 20 cm spatial resolution differential pulse pair Brillouin optical time-domain analysis (DPP-BOTDA) technique is used to measure a 69 m long offshore wind turbine pile under horizontal loading. From the distributed strain data collected in the test, the maximum stress location of the long pile under the horizontal load can be obtained. By analyzing the load and maximum strain (F-εmax) curve, the horizontal bearing capacity of the pile foundation can exceed 900 kN, which is the maximum horizontal load of the design. The distributed displacement calculation method based on distributed strain data is proposed, according to the force characteristics of steel pipe piles. By comparing the calculated displacement data with the measured data by the dial indicators, the mean absolute percentage error (MAPE) value is only 0.03548. Results show that the 20 cm spatial resolution DPP-BOTDA technology is very suitable for the bearing capacity test of offshore wind turbine steel pipe pile foundations.

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Application of Distributed Optical Fiber Sensing Technique in Monitoring the Ground Deformation

Cited by 20 publications

References 14 publications

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

Application of Brillouin-based distributed optical fibre sensing technology to measure strain development of a slope model

Horizontal Loading Performance of Offshore Wind Turbine Pile Foundation Based on DPP-BOTDA

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