Submillimeter crack detection with brillouin-based fiber-optic sensors

Ravet, Fabien; Briffod, Fabien; Glišić, Branko; Niklès, Marc; Inaudi, Daniele

doi:10.1109/jsen.2009.2019325

Cited by 59 publications

(45 citation statements)

References 17 publications

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“…This has led to monitoring systems with distributed optical fiber, having the possibility to detect, localize and measure with high precision and in a timely manner, the damage on a monitored structure. 6,7 In the specific case of concrete structures, much of the structural damage that is to be identified is manifested by the appearance of cracks. This is why to detect, to locate and mainly to obtain the crack width becomes of greater relevance.…”

Section: Introductionmentioning

confidence: 99%

Cracking assessment in concrete structures by distributed optical fiber

Rodríguez

Casas

Villaba

2015

Smart Mater. Struct.

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In this paper, a method to obtain crack initiation, location and width in concrete structures subjected to bending and instrumented with an OBR system (Optical Backscattered Reflectometer) is proposed. Continuous strain data with high spatial resolution and accuracy are the main advantages of the OBR system. These characteristics make this Structural Health Monitoring (SHM) technique a useful tool in early damage detection in important structural problems. In the specific case of reinforced concrete structures, which exhibit cracks even in-service loading, the possibility to obtain strain data with high spatial resolution is a main issue. In this way, this information is of paramount importance concerning the durability and long performance and management of concrete structures.The proposed method is based on the results of a test up to failure carried out on a reinforced concrete slab. Using test data and different crack modelling criteria in concrete structures, simple non-linear finite element models were elaborated to validate its use in the localization and appraisal of the crack width in the testing slab.

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Section: Introductionmentioning

confidence: 99%

Cracking assessment in concrete structures by distributed optical fiber

Rodríguez

Casas

Villaba

2015

Smart Mater. Struct.

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“…Nowadays, DOFSs based on Brillouin backscattering are used in laboratory tests or in SHM systems applied in civil structures as bridges, buildings, pipelines and railways (Ohno et al 2001). In all of these applications, if the damage detection is one of the aims of the SHM process, complex algorithms (Ravet et al 2009) and/or sophisticated devices (Shen et al 2010) are used to obtain millimetric spatial resolution with DOFSs based on Brillouin backscattering. Recently, a system that uses Rayleigh backscattering to obtain distributed measurements with a spatial resolution in a millimetric range was developed.…”

Section: Brillouin Optical Time Domain Analysis (Botda)mentioning

confidence: 99%

SHM by DOFS in civil engineering: a review

Rodríguez¹,

Casas²,

Villalba³

2015

Structural Monitoring and Maintenance

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Abstract. This paper provides an overview of the use of different Distributed Optical Fiber Sensor systems (DOFSs) to perform Structural Health Monitoring (SHM) in the specific case of civil engineering structures. Nowadays, there are several methods available for extracting distributed measurements from optical fiber, and their use have to be according with the aims of the SHM performance. The continuous-in-space data is the common advantage of the different DOFSs over other conventional health monitoring systems and, depending on the particular characteristics of each DOFS, a global and/or local health structural evaluation is possible with different accuracy. Firstly, the fundamentals of different DOFSs and their principal advantages and disadvantages are presented. Then, laboratory and field tests using different DOFSs systems to measure strain in structural elements and civil structures are presented and discussed. Finally, based on the current applications, conclusions and future trends of DOFSs in SHM in civil structures are proposed.

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“…The Shannon-Hartley capacity theorem states: (5) for channel capacity (bits/second) C, and bandwidth of signal B [23]. This assumes a channel of additive white Gaussian noise, a reasonable approximation to the fibre sensing systems discussed.…”

Section: Theoretical Fundamental Limitsmentioning

confidence: 99%

“…This allows the effective structural health monitoring (SHM) of a wide range of civil-engineering projects facing challenges such as ageing or nearby construction works; key applications include large structures such as bridges, tunnels, railways, power plants and similar utility buildings [2]. By attaching standard optical fibre to any such building or structure, cracks and shifts in the structural body can be discovered quickly and non-invasively [5]. Sensing in this way can increase building safety and allow the construction of increasingly large civil engineering projects, whilst reducing costs and automating previously manual inspection procedures.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Noise Within BOTDA and Cotdr Systems to Study the Impact on Dynamic Sensing

Funnell

Yan

et al. 2015

International Journal on Smart Sensing and Intelligent Systems

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Abstract-Real-time structural health monitoring requires dynamic sensing of distributed strain and temperature. Brillouin Optical Time Domain Analysis (BOTDA) and Rayleigh Coherent Optical Time Domain Reflectometry (COTDR) are promising candidates to achieve dynamic sensing. A noise model with specific parametric simulation of independent laser and detector noise sources has been developed. Although ensemble averaging significantly enhances the signal-to-noise ratio (SNR) in both systems, itstime-consuming accumulation procedure prevents dynamic sensing. The sequence of averaging in the signal processing workflow varies the SNR for both systems. The system components should be optimized to reduce averaging times and achieve the required system specifications, including dynamic sensing.

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Submillimeter crack detection with brillouin-based fiber-optic sensors

Cited by 59 publications

References 17 publications

Cracking assessment in concrete structures by distributed optical fiber

Cracking assessment in concrete structures by distributed optical fiber

SHM by DOFS in civil engineering: a review

Simulation of Noise Within BOTDA and Cotdr Systems to Study the Impact on Dynamic Sensing

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