Applications of a distributed fiber optic crack sensor for concrete structures

Wan, Kai Tai; Leung, Christopher Kin Ying

doi:10.1016/j.sna.2006.09.004

Cited by 79 publications

(34 citation statements)

References 7 publications

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“…Specifically, OTDR is a photoelectric integrated instrument which uses the backward scattering of Rayleigh scattering and Fresnel reflection of light to test the optical fiber when it is transmitted through optical fiber. This backward Rayleigh scattering technology mainly measures the time it takes for the pulse light wave to transmit in the optical fiber for locating the place with scattering loss [12][13][14]. Widely applied in the maintenance and construction of cable circuits, it can measure the length of optical fiber, transmission loss of optical fiber, splice attenuation, and fault location.…”

Section: Otdr Theories and Application For Real-time Tunnel Monitoringmentioning

confidence: 99%

Inversion Calculation Analysis of Operational Tunnel Structure Based on the Distributed Optical-Fiber Sensing System

Zhao

Feng

Ren

2017

Advances in Civil Engineering

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In combination of the actual project in Dalian Baiyun Mountain Tunnel, this paper introduces the principle of fiber optic sensor monitoring system based on optical time domain reflectometer. Then, based on the orthogonal design and even design scheme, this paper carries out a numerical experiment on the tunnel surrounding rock and establishes a regression model of the mapping relation between surrounding rock parameters of operation tunnel and the monitored displacement in order to set the difference between the monitored displacement and the calculated displacement as the fitness function. In the end, this paper carries out parameter identification based on the differential evolution algorithm. Achievements of the study proved that real-time safety warning could be realized inside the tunnel by monitoring the deformation parameters of tunnel vault at real time relying on the optical-fiber sensing system of the optical time domain reflectometer (OTDR). Parameters identification was carried out on the structure with differential evolution according to measured data and selected parameters, and great coincidence was obtained between the measured displacement and the identified parameters displacement, which proved the strong adaptability of the method.

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Section: Otdr Theories and Application For Real-time Tunnel Monitoringmentioning

confidence: 99%

Inversion Calculation Analysis of Operational Tunnel Structure Based on the Distributed Optical-Fiber Sensing System

Zhao

Feng

Ren

2017

Advances in Civil Engineering

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“…Preliminary experimental results on concrete specimens showed that the proposed approach could detect the crack opening width as small as 0.1 mm. Recently, their method was used to monitor multiple flexural cracks under static loading, crack monitoring under cyclic loading as well as the detection of shrink crack under restraint in concrete beams [34]. However, this method was not feasible to detect cracks parallel to the surface of the structure.…”

Section: Detection Of Defectsmentioning

confidence: 99%

Smart Sensing Technologies for Structural Health Monitoring of Civil Engineering Structures

Sun

Staszewski

Swamy

2010

Advances in Civil Engineering

107

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Structural Health Monitoring (SHM) aims to develop automated systems for the continuous monitoring, inspection, and damage detection of structures with minimum labour involvement. The first step to set up a SHM system is to incorporate a level of structural sensing capability that is reliable and possesses long term stability. Smart sensing technologies including the applications of fibre optic sensors, piezoelectric sensors, magnetostrictive sensors and self-diagnosing fibre reinforced composites, possess very important capabilities of monitoring various physical or chemical parameters related to the health and therefore, durable service life of structures. In particular, piezoelectric sensors and magnetorestrictive sensors can serve as both sensors and actuators, which make SHM to be an active monitoring system. Thus, smart sensing technologies are now currently available, and can be utilized to the SHM of civil engineering structures. In this paper, the application of smart materials/sensors for the SHM of civil engineering structures is critically reviewed. The major focus is on the evaluations of laboratory and field studies of smart materials/sensors in civil engineering structures.

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“…Change in electrical resistance of a carbon powder-glass fiber reinforced plastic sensor was measured for crack detection [5]. Optical fiber-type sensors have been developed for structural condition monitoring [6][7][8][9][10][11]. However, these sensing systems were complex and expensive because detection instruments for detecting light or electronic signals are necessary.…”

Section: Introductionmentioning

confidence: 99%

A microcapsule-type fluorescent probe for the detection of microcracks in cementitious materials

Song

Lee

Kim

et al. 2016

Sensors and Actuators B: Chemical

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Applications of a distributed fiber optic crack sensor for concrete structures

Cited by 79 publications

References 7 publications

Inversion Calculation Analysis of Operational Tunnel Structure Based on the Distributed Optical-Fiber Sensing System

Inversion Calculation Analysis of Operational Tunnel Structure Based on the Distributed Optical-Fiber Sensing System

Smart Sensing Technologies for Structural Health Monitoring of Civil Engineering Structures

A microcapsule-type fluorescent probe for the detection of microcracks in cementitious materials

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