&lt;title&gt;Truly distributed strain and temperature sensing using embedded optical fibers&lt;/title&gt;

Thévenaz, Luc; Niklès, Marc; Fellay, Alexandre; Facchini, M.; Robert, Philippe A.

doi:10.1117/12.316986

Cited by 60 publications

(24 citation statements)

References 6 publications

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“…T (10) From this equation, a 72.4°C temperature corresponds to a 12860 MHz Brillouin frequency. For C T , the value of 1.22…”

Section: Resultsmentioning

confidence: 99%

“…In 1995, Bao et al investigated fiber lengths as long as 51 km [11], while temperature and spatial resolutions of ±1°C and 1 m respectively have been achieved for shorter fiber lengths of 1 -3 km [9][10][11][12][13]. Although a number of scattering mechanisms have been proposed for distributed temperature sensing [6][7][8], the Brillouin scattering mechanism is thought to be most appropriate for fire detection due to its enormous potential for monitoring remote locations with increased temperature sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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Brillouin Scattering Based Distributed Fiber Optic Temperature Sensing For Fire Detection

Liu¹,

Ferrier²,

Bao³

et al. 2003

Fire Safety Science - Proceedings of the Seventh International

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This paper presents a distributed fiber optic Brillouin scattering investigation, which involves measuring the Brillouin intensity versus time for real-time temperature measurements. This can be applied in practical fire detection schemes through the use of a threshold temperature that corresponds to the maximum Brillouin intensity. In the experiments, a 11 km fiber length was interrogated by 20 ns pulses (2 m spatial resolution) to monitor the temperature variations in a 10 m fiber region. The corresponding theory has confirmed the suitability of real-time intensity monitoring for temperature measurement.

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“…T (10) From this equation, a 72.4°C temperature corresponds to a 12860 MHz Brillouin frequency. For C T , the value of 1.22…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Brillouin Scattering Based Distributed Fiber Optic Temperature Sensing For Fire Detection

Liu¹,

Ferrier²,

Bao³

et al. 2003

Fire Safety Science - Proceedings of the Seventh International

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“… 2 microphone arrays, ensuring a good coverage in the monitored area;  135 FBG sensors, displaced on a grid of maximum 250 meters spacing;  50 gas sensors for the detection of methane, according to Beer-Lambert law (Mazotti et al [10]);  75 km of fibre optic cables for temperature monitoring by means of distributed sensing commercial devices (Thenevaz et al [11]). A simulation platform has been developed in a Labview environment in order to evaluate system performances.…”

Section: Discussionmentioning

confidence: 99%

An innovative approach to forest fires detection and monitoring: the EU-FIRE project

Viegas¹,

Pita²,

Haddad³

et al. 2009

Safety and Security Engineering III

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The EU-FIRE project has the objective of designing a new forest fire monitoring system able to guarantee accurate and continuous surveillance and forecasting, immediate detection of fire beginnings, monitoring of the fire's evolution, and timely exchange of information from fire fronts. The main technological gaps are filled by the integration of optoelectronic and acoustic technologies. The EU-FIRE integrated prototype is based on: (a) A completely new acoustic system for volumetric scanning, based on high directional arrays of microphones, contributing to give a deeper monitoring of forest safety through the possibility of detecting and tracking fires from the beginning by the recognition of their acoustic emission spectrum (i.e. their "sound/noise"). (b) A completely new design of fibre optic sensor networks for temperature and gaseous emissions monitoring installed in grids around sensible infrastructures to provide information on fire movements. Data from fibre optic sensors is collected through new optoelectronic reading units. (c) A completely new acquisition unit for data fusion from both innovative and traditional systems. The project activities covered the characterization of fires' acoustic signature and heat transfer related to fire spread and environmental conditions, type and quantity of material in combustion, background noise, topography, and distance from the source. To achieve these goals, several field tests were performed in 2007 and 2008 -indoor tables and outdoor plots have been burned with different fuels (straw, shrubs, login slash, and pine needles) and environmental conditions. Data have been collected using standard instrumentation consisting of microphones, 2-D and 3-D microphone arrays and fibre optic temperature sensors. Data post processing drove the design of the system in terms of microphones and arrays of numbers and positions, temperature fibre optic sensor installation constraints, etc.

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“…The principle of DTS measurements for quality control during concrete curing has been applied since the late 1990s (Thevenaz et al 1998), especially in large arched dams and other large-volume concrete structures.…”

Section: Hypothesismentioning

confidence: 99%

Distributed temperature sensing applied during diaphragm wall construction

et al. 2017

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Distributed temperature sensing (DTS) can be used to monitor the production process of diaphragm walls. DTS is able to differentiate between already present or fresh bentonite suspensions during refreshing of the bentonite slurry in the trench. During concrete casting, DTS is able to differentiate between the bentonite suspension and concrete. As a result, the continuity of the casting process and the arrival of good grade concrete at crucial locations in the trench can be monitored. Tests conducted on laboratory models provided reference information for interpretation of field data. Field experiences have shown the benefits of DTS tests and the predictive value of the reference measurements. Results are compared with crosshole sonic logging measurements at the same location.Key words: distributed temperature sensing (DTS), diaphragm wall, joint, quality control.Résumé : Des capteurs de température distribués (CTD) peuvent être utilisés pour surveiller le processus de production de parois moulées. CTD est capable de faire la différence entre des suspensions de bentonite déjà présentes et des nouvelles lors de l'actualisation de la suspension de bentonite dans la tranchée est en course. Au cours de la coulée du béton, CTD est capable de faire la différence entre la suspension de bentonite et de béton. En conséquence, la continuité du processus de coulée et l'arrivée de béton de bonne qualité à des endroits cruciaux dans la tranchée peuvent être surveillés. Les essais effectués sur des modèles de laboratoire ont fourni des informations de référence pour l'interprétation des données sur le terrain. Des expériences de terrain ont montré les avantages des essais CTD et la valeur prédictive des mesures de référence. Les résultats sont comparés avec les mesures d'auscultation sonique au même endroit.Mots-clés : capteurs de température distribués (CTD), paroi moulée, joint, contrôle de qualité.

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<title>Truly distributed strain and temperature sensing using embedded optical fibers</title>

Cited by 60 publications

References 6 publications

Brillouin Scattering Based Distributed Fiber Optic Temperature Sensing For Fire Detection

Brillouin Scattering Based Distributed Fiber Optic Temperature Sensing For Fire Detection

An innovative approach to forest fires detection and monitoring: the EU-FIRE project

Distributed temperature sensing applied during diaphragm wall construction

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