Measuring mortar shrinkage and cracking by pulse pre-pump Brillouin optical time domain analysis with a single optical fiber

Bao, Yi; Meng, Weina; Chen, Yizheng; Chen, Genda; Khayat, Kamal H.

doi:10.1016/j.matlet.2015.01.140

Cited by 68 publications

(31 citation statements)

References 8 publications

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“…Both layers are composed of monomers, oligomers, photoinitiators, and additives (Kouzmina et al 2010). The distributed sensors measure Brillouin frequency shifts due to temperature and/or strain changes (Bao et al 2015). Once calibrated, the sensors can be used to evaluate the temperature and strain changes from the measured Brillouin frequency shifts (Bao and Chen 2015, 2016b).…”

Section: Experimental Programmentioning

confidence: 99%

“…The transmission cable and the temperature sensor were closely spaced and thus subjected to approximately the same temperatures. Therefore, the strain at the location of DFOS can be determined from the Brillouin frequency shift with temperature compensation as described by Bao et al (2015).…”

Section: Experimental Programmentioning

confidence: 99%

“…The application of BOTDR and BOTDA, however, is limited because of low spatial resolution of the measurements, often as large as 15 cm (Bao and Chen 2011). Recently, a pulse prepumped BOTDA (PPP-BOTDA) technology has been commercialized for simultaneous strain and temperature measurement with 2-cm spatial resolution over a measurement distance of 0.5 km (Kishida and Li 2006; Bao et al 2015). However, implementation of distributed fiber optic sensors for structural fire research has not been fully explored.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of Steel Beams Subjected to Fire Enhanced by Brillouin Scattering-Based Fiber Optic Sensor Data

et al. 2017

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This paper presents high temperature measurements using a Brillouin scattering-based fiber optic sensor and the application of the measured temperatures and building code recommended material parameters into enhanced thermomechanical analysis of simply supported steel beams subjected to combined thermal and mechanical loading. The distributed temperature sensor captures detailed, nonuniform temperature distributions that are compared locally with thermocouple measurements with less than 4.7% average difference at 95% confidence level. The simulated strains and deflections are validated using measurements from a second distributed fiber optic (strain) sensor and two linear potentiometers, respectively. The results demonstrate that the temperature-dependent material properties specified in the four investigated building codes lead to strain predictions with less than 13% average error at 95% confidence level and that the Europe building code provided the best predictions. However, the implicit consideration of creep in Europe is insufficient when the beam temperature exceeds 800°C.

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Section: Experimental Programmentioning

confidence: 99%

Section: Experimental Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of Steel Beams Subjected to Fire Enhanced by Brillouin Scattering-Based Fiber Optic Sensor Data

et al. 2017

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“…Thus, a pulse pre-pump BOTDA (PPP-BOTDA) has recently been developed and commercialized with spatial resolution of 2 cm over a measurement distance of 0.5 km [20, 21]. PPP-BOTDA sensors for strain and temperature measurement at elevated temperatures were characterized [22–24], and implemented the sensors for steel beams in fire [25].…”

Section: Introductionmentioning

confidence: 99%

Temperature measurement and damage detection in concrete beams exposed to fire using PPP-BOTDA based fiber optic sensors

Bao

Hoehler

Smith

et al. 2017

Smart Mater. Struct.

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In this study, distributed fiber optic sensors based on pulse pre-pump Brillouin optical time domain analysis (PPP-BODTA) are characterized and deployed to measure spatially-distributed temperatures in reinforced concrete specimens exposed to fire. Four beams were tested to failure in a natural gas fueled compartment fire, each instrumented with one fused silica, single-mode optical fiber as a distributed sensor and four thermocouples. Prior to concrete cracking, the distributed temperature was validated at locations of the thermocouples by a relative difference of less than 9 %. The cracks in concrete can be identified as sharp peaks in the temperature distribution since the cracks are locally filled with hot air. Concrete cracking did not affect the sensitivity of the distributed sensor but concrete spalling broke the optical fiber loop required for PPP-BOTDA measurements.

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“…Many kinds of distributed optical fiber sensors (DOFS) have been developed for the monitoring of structural health and have gotten satisfying results [1][2][3][4][5][6]. However, only a few of them can monitor both the vibration and strain/temperature simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Distributed Strain and Vibration Sensing System Based on Phase-Sensitive OTDR

Zhou

Wang

et al. 2015

IEEE Photon. Technol. Lett.

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A system based on phase-sensitive optical time domain reflectometry (Φ-OTDR) is proposed for simultaneously strain and vibration sensing. The strain of fiber is detected by comparing the patterns of signal for different laser frequencies, and the vibration of fiber is detected simultaneously from the signals for any certain laser frequency. During the measurement, frequencies of the probe optical pulses are modulated sequentially in ascending or descending order. Using the signals generated by optical pulses with the same frequency, the vibration of fiber is detected with fast response speed; using that with different frequencies, the strain of fiber is detected with high resolution. In our experiment, a sensing system with 2 m spatial resolution, up to 1 kHz frequency measurement range and 10 n strain resolution is realized for a 9 km sensing fiber length. Index Terms-Distributed optical fiber sensor, phase-sensitive optical time domain reflectometry, strain measurement, vibration measurement

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Measuring mortar shrinkage and cracking by pulse pre-pump Brillouin optical time domain analysis with a single optical fiber

Cited by 68 publications

References 8 publications

Experimental Analysis of Steel Beams Subjected to Fire Enhanced by Brillouin Scattering-Based Fiber Optic Sensor Data

Experimental Analysis of Steel Beams Subjected to Fire Enhanced by Brillouin Scattering-Based Fiber Optic Sensor Data

Temperature measurement and damage detection in concrete beams exposed to fire using PPP-BOTDA based fiber optic sensors

Distributed Strain and Vibration Sensing System Based on Phase-Sensitive OTDR

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