Field calibration device for Raman backscatter based fiber optic distributed temperature system (DTS) technology

Bertrand, Johan; Morice, R.; Beaumont, Olivier; Dubois, Jean-Philippe

doi:10.1117/12.974942

Cited by 5 publications

(5 citation statements)

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“…where each point along the optical fiber is according to the localization in the gallery). In order to avoid this sort of problem, a reference cartridge (Evertherm) [3] developed by Andra and LNE (French National metrology institute and test) was installed and tested. It allowed the control of temperature measurements by Raman scattering in OFS cable.…”

Section: B Data Treatmentmentioning

confidence: 99%

Monitoring System Design of Underground Repository for Radioactive Wastes – In Situ Demonstrator

Farhoud¹,

Delépine-Lesoille²,

Buschaert³

et al. 2015

IJET

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Abstract-This paper describes the qualification of sensors envisioned for Cigéo, the planned deep disposal center for French radioactive waste. More precisely, it describes an in situ demonstrator, similar with the system planned to monitor intermediate level long lived radioactive wastes cells. These cells would be a tunnel, located 490 m deep, with 9 m in diameter, with concrete liners realized in three steps.The demonstrator was instrumented in 2011 in the Andra's Underground Research Laboratory. The instruments provide useful information on sensors' adaptability to the environment; robustness and technology comparisons (accordance and discrepancies). As an example, accordance between localized sensors and distributed measurements for strains, by optical fiber sensors and vibrating wire extensometers and temperatures, by optical fiber sensors and platinum probe, was verified.After 3 years more than 95% of sensors still provide measurements and show no drift over time.

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Section: B Data Treatmentmentioning

confidence: 99%

Monitoring System Design of Underground Repository for Radioactive Wastes – In Situ Demonstrator

Farhoud¹,

Delépine-Lesoille²,

Buschaert³

et al. 2015

IJET

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“…To match Euclidien distance and curvilinear abscissa, it is of utmost important to realize a dynamic a map after installation, for instance, by heating or cooling remarkable locations. More industrial reference points can also be included in the sensing lines [ 50 ]. Under these precautions, as illustrated in Figure 15 , distributed Raman systems produced good quality data over several hundred meters.…”

Section: Results On Distributed Temperature Measurementsmentioning

confidence: 99%

“…They could be repaired at the expense of total length change. Such slight changes (in the order of 20 cm of 500 m) in the total distance range and in the sensing area location proved to be very difficult to manage; On-line references are a promising solution [ 50 ].…”

Section: Results On Distributed Strain Measurementsmentioning

confidence: 99%

France’s State of the Art Distributed Optical Fibre Sensors Qualified for the Monitoring of the French Underground Repository for High Level and Intermediate Level Long Lived Radioactive Wastes

Delépine-Lesoille

Girard

Landolt

et al. 2017

Sensors

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This paper presents the state of the art distributed sensing systems, based on optical fibres, developed and qualified for the French Cigéo project, the underground repository for high level and intermediate level long-lived radioactive wastes. Four main parameters, namely strain, temperature, radiation and hydrogen concentration are currently investigated by optical fibre sensors, as well as the tolerances of selected technologies to the unique constraints of the Cigéo’s severe environment. Using fluorine-doped silica optical fibre surrounded by a carbon layer and polyimide coating, it is possible to exploit its Raman, Brillouin and Rayleigh scattering signatures to achieve the distributed sensing of the temperature and the strain inside the repository cells of radioactive wastes. Regarding the dose measurement, promising solutions are proposed based on Radiation Induced Attenuation (RIA) responses of sensitive fibres such as the P-doped ones. While for hydrogen measurements, the potential of specialty optical fibres with Pd particles embedded in their silica matrix is currently studied for this gas monitoring through its impact on the fibre Brillouin signature evolution.

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“…All three scattered effects create the basis for distributed sensors. Brillouin scattering is suitable for strain and temperature monitoring with the usage of single mode fiber, Raman scattering can be apply for temperature monitoring only but it uses multimode fiber [1], [2]. In both devices not only temperature but position of temperature changes is specified.…”

Section: Introductionmentioning

confidence: 99%

Usage of Raman DTS for wooden material analysis

Vašinek

Látal

Koudelka

et al. 2013

Optical Sensors 2013

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The contribution deals with a usage of Raman DTS for thermal transmittance monitoring and moisture monitoring in wooden buildings and constructions. Temperature measurement and thermal transmittance is notable for an analysis of moisture distribution inside of wooden girders that are the basic construction parts of wooden buildings during their seasoning and sanitation. In this contribution the results from measurements within real wooden objects will be presented and these results will be compared with laboratory experiments under controlled conditions. For wood sanitation two types of heating are used -flow of hot air and microwave heating. A multimode fiber 62,5/125 in primary coating is applied for measurements, this fiber is putted on the inside and outside surface of wooden construction. Here the fiber meanders are created inside of wooden girders with spacing of 1 cm. Optical fibers are laid in two mutual perpendicular cuts with usage of temperature resolution better than 0,05 o C. The measured length of wooden girder is 1,4 m for unambiguously temperature specification inside the girder and its thermal transmittance. The temperature maps of various types of wooden girders are the results of analysis. Different multimode fibers with particular fiber coatings are included in the analysis. These measurements have been provided with Sentinel DTS and they are parts of a wide set DTS application for building industry. We are trying to specify the influence of fiber bending on temperature sensitivity, how to join measuring fiber to transporting fiber, critical length of both fibers and many others. Raman DTS can replace large number of thermometers and provide continuous information about temperature distribution.

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Field calibration device for Raman backscatter based fiber optic distributed temperature system (DTS) technology

Cited by 5 publications

References 0 publications

Monitoring System Design of Underground Repository for Radioactive Wastes – In Situ Demonstrator

Monitoring System Design of Underground Repository for Radioactive Wastes – In Situ Demonstrator

France’s State of the Art Distributed Optical Fibre Sensors Qualified for the Monitoring of the French Underground Repository for High Level and Intermediate Level Long Lived Radioactive Wastes

Usage of Raman DTS for wooden material analysis

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