Theoretical and Experimental Investigations into Crack Detection with BOTDR-Distributed Fiber Optic Sensors

Feng, Xin; Zhou, Jing; Sun, Cheng; Zhang, Xiaotan; Ansari, Farhad

doi:10.1061/(asce)em.1943-7889.0000622

Cited by 122 publications

(96 citation statements)

References 23 publications

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“…5, when a pulse of light is launched into an unperturbed optical fiber, the attenuation decays exponencially with time due to the intrinsic loss in the fiber (Yu and Yin 2002). This is one of the principal reasons that OTDR is considered a linear backscattering system (Zeni 2009 andFang et al 2012). However, when an optical fiber is tested As DOFSs and due to its low spatial resolution of 1 m, the applications of OTDR in the SHM applications are limited.…”

Section: Optical Time Domain Reflectometer (Otdr)mentioning

confidence: 99%

“…For this reason, these methods are very limited in practical applications. In the case of DOFSs based on Brillouin backscattering, BOTDR and BOTDA systems offer typically a spatial resolution of 1 m, however, there are several proposed methods to measure cracks in concrete structural elements using these systems (Klar et al 2010, Shen et al 2010, Feng et al 2013). All these methods had been proved in laboratory with acceptable results, but they can still be improved.…”

Section: Crack Detection In Concrete Elementsmentioning

confidence: 99%

“…The first DOFSs were based only in the attenuation measurement produced by external effects in Rayleigh backscattering process (Yu andYin 2002 andFang et al 2012). Later, based on the opto-electronic system development, strain and/or temperature DOFSs were implemented.…”

Section: Distributed Optical Fiber Sensorsmentioning

confidence: 99%

“…6. The main task of a Brillouin sensor is to acquire the frequency shift B (Fang et al 2012), using a pulsed light that is launched into the FUT to generate spontaneous Brillouin scattering spectrum as shown in Fig. 3.…”

Section: Brillouin Optical Time Domain Reflectometer (Botdr)mentioning

confidence: 99%

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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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Section: Optical Time Domain Reflectometer (Otdr)mentioning

confidence: 99%

Section: Crack Detection In Concrete Elementsmentioning

confidence: 99%

Section: Distributed Optical Fiber Sensorsmentioning

confidence: 99%

Section: Brillouin Optical Time Domain Reflectometer (Botdr)mentioning

confidence: 99%

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SHM by DOFS in civil engineering: a review

Rodríguez¹,

Casas²,

Villalba³

2015

Structural Monitoring and Maintenance

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“…When the critical stress is reached, cracking of the coating is initiated, resulting in strain singularity. The distributed FOSs investigated in [7][8][9] could detect the strain singularity induced by the cracking in a structure.…”

Section: Monitoring Schemementioning

confidence: 99%

Surface Crack Detection in Prestressed Concrete Cylinder Pipes Using BOTDA Strain Sensors

Feng

Zhong

et al. 2017

Mathematical Problems in Engineering

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Structural deterioration after a period of service can induce the failure of prestressed concrete cylinder pipes (PCCPs), with microcracks in the coating leading to the corrosion of the prestressed wires. In this paper, we propose the use of Brillouin optical time-domain analysis (BOTDA) strain sensors for detecting the onset of microcracking in PCCP coating: the BOTDA strain sensors are mounted on the surface of the PCCP, and distributed strain measurements are employed to assess the cracks in the mortar coating and the structural state of the pipe. To validate the feasibility of the proposed approach, experimental investigations were conducted on a prototype PCCP segment, wherein the inner pressure was gradually increased to 1.6 MPa. Two types of BOTDA strain sensors-the steel wire packaged fiber optic sensor and the polyelastic packaged fiber optic sensor-were employed in the experiments. The experimental distributed measurements agreed well with the finite element computations, evidencing that the investigated strain sensors are sensitive to localized deterioration behaviors such as PCCP microcracking.

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Dehnungsmessung bei mehraxialen Druckversuchen an Beton mittels faseroptischer Sensoren

Speck

Vogdt

Curbach

et al. 2021

Beton und Stahlbetonbau

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Für die Quantifizierung lastinduzierter anisotroper Schädigungen unter verschiedenen mehraxialen Spannungszuständen ist die Dehnungsmessung im Inneren kleinformatiger Probekörper erforderlich. Quasikontinuierlich messende faseroptische Sensoren ohne werksseitige Schutzummantelung können dafür neue Möglichkeiten eröffnen. Dieser Beitrag erläutert die Herausforderungen bei der Dehnungsmessung bei mehraxialen Versuchen und das Potenzial der quasikontinuierlichen Dehnungsmessung mit faseroptischen Sensoren. Es wird die Positionierung der Messfasern mittels eines Messingprofils in den unbewehrten Probekörpern erläutert und die Beeinflussung der Betoneigenschaften durch dieses Trägergestell. Die möglichen Messgenauigkeiten und messtechnischen Besonderheiten speziell hinsichtlich der querdruckempfindlichen und nicht alkaliresistenten Messfasern werden aufgezeigt. Ein Vergleich mit der häufig angewandten Dehnungsmessung über die Bürstenverformung zeigt, dass trotz aller bestehenden Herausforderungen die faseroptischen Sensoren eine Dehnungsmessung bei dreiaxialen Versuchen in bisher nicht erreichbarer Genauigkeit ermöglichen.

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Theoretical and Experimental Investigations into Crack Detection with BOTDR-Distributed Fiber Optic Sensors

Cited by 122 publications

References 23 publications

SHM by DOFS in civil engineering: a review

SHM by DOFS in civil engineering: a review

Surface Crack Detection in Prestressed Concrete Cylinder Pipes Using BOTDA Strain Sensors

Dehnungsmessung bei mehraxialen Druckversuchen an Beton mittels faseroptischer Sensoren

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