Optical Fiber Sensors from Laboratory to Field Trials: Applications and Trends at CEA LIST

Ferdinand, Pierre; Magne, Sylvain; Laffont, Guillaume; Dewynter, Véronique; Maurin, Laurent; Prud'Homme, Christophe; Roussel, Nicolas; Giuseffi, M.; Maguis, Séverine

doi:10.1080/01468030802272559

Cited by 5 publications

(6 citation statements)

References 8 publications

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“…They are now well-characterized and are used in a variety of high-performance communication and sensing devices. In the field of sensing, standard (type I) FBGs are usually employed to detect physical and/or chemical parameters such as temperature, strain, pressure and refractive index [ 16 , 17 ]. A fiber Bragg grating is a periodic or aperiodic perturbation of the effective refractive index of the guiding core of an optical waveguide, such as single-mode optical fibers.…”

Section: Key Aspects Of Fiber Bragg Grating Sensing Technology Formentioning

confidence: 99%

“…There is a wide diversity of scientific and industrial applications for FBG sensing technology [ 2 , 12 , 16 ]. FBG sensors are not limited to research and laboratories testing: they are now widely used in many industrial fields and have gain in maturity through two decades of field tests by numerous international teams.…”

Section: Key Aspects Of Fiber Bragg Grating Sensing Technology Formentioning

confidence: 99%

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Temperature Resistant Fiber Bragg Gratings for On-Line and Structural Health Monitoring of the Next-Generation of Nuclear Reactors

Laffont

Cotillard

Roussel

et al. 2018

Sensors

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The harsh environment associated with the next generation of nuclear reactors is a great challenge facing all new sensing technologies to be deployed for on-line monitoring purposes and for the implantation of SHM methods. Sensors able to resist sustained periods at very high temperatures continuously as is the case within sodium-cooled fast reactors require specific developments and evaluations. Among the diversity of optical fiber sensing technologies, temperature resistant fiber Bragg gratings are increasingly being considered for the instrumentation of future nuclear power plants, especially for components exposed to high temperature and high radiation levels. Research programs are supporting the developments of optical fiber sensors under mixed high temperature and radiative environments leading to significant increase in term of maturity. This paper details the development of temperature-resistant wavelength-multiplexed fiber Bragg gratings for temperature and strain measurements and their characterization for on-line monitoring into the liquid sodium used as a coolant for the next generation of fast reactors.

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Section: Key Aspects Of Fiber Bragg Grating Sensing Technology Formentioning

confidence: 99%

Section: Key Aspects Of Fiber Bragg Grating Sensing Technology Formentioning

confidence: 99%

Temperature Resistant Fiber Bragg Gratings for On-Line and Structural Health Monitoring of the Next-Generation of Nuclear Reactors

Laffont

Cotillard

Roussel

et al. 2018

Sensors

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“…Therefore there is no strip-roll contact at the edge in the roll gap. Fibre optics are considered in this study; they rely on the principle of Bragg gratings and which give the local strains by interpreting the wavelengths as explained by Ferdinand et al (2009). Fibre optics inserted in a thin radial hole in the roll is technologically possible.…”

Section: Fibre Opticsmentioning

confidence: 99%

A new sensor for the evaluation of contact stress by inverse analysis during steel strip rolling

Weisz-Patrault¹,

Ehrlacher²,

Legrand³

2011

Journal of Materials Processing Technology

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International audienceKnowledge of the contact stress between roll and strip becomes a critical factor in modern, high-speed rolling mills. In this paper, an inverse analytical method is developed to determine the contact stress in the roll gap by measuring the stress tensor with fibre optics at only one point inside the roll. Unlike many inverse methods, no matrix inversion is needed because the very small contact length would lead to ill-conditioned matrices. Iterative methods are also not studied because short computation times are desired. This approach uses the theory of elasticity on the assumption that the problem is isothermal and planar and relies on the expansion of holomorphic functions into a power series. On the other hand, the computation time is studied to rapidly optimise the industrial parameters during the rolling process. Hot, cold and temper-rolling simulations are given to demonstrate the accuracy of the method and the feasibility of this new kind of sensor, taking into account the restrictions (e.g., frequency of acquisition) of the local measurement system

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“…The FBG acts as a local sensor characterized by its Bragg wavelength λ Bragg = 2 n e f f Λ, where n e f f is the effective refractive index of the core of the optical fiber, and Λ the pitch of the grating. At a usual scale (a few tenths of Kelvin and a few hundreds of µm/m), this sensor is mainly sensitive to both temperature variations ∆T and longitudinal strain variations ∆ε, and to a lesser extent, to hydrostatic pressure variations ∆P according to the following relationship (Ferdinand et al (2009)):…”

Section: Experimental Apparatusmentioning

confidence: 99%

Experimental evaluation of contact stress during cold rolling process with optical fiber Bragg gratings sensors measurements and fast inverse method

Weisz-Patrault

Maurin

Legrand

et al. 2015

Journal of Materials Processing Technology

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International audienceThere is a strategic importance for the steel rolling industry to get a better understanding of the strip–roll interaction to improve roll-gap models, increase strip quality and decrease roll degradation. This requires roll-gap sensors able to measure this interaction under industrial rolling conditions and in real time in order to propose a feed-back control of process parameters. To reach these goals, this paper proposes a new roll-gap friction sensor based on an inverse method that interprets optical fiber Bragg gratings(FBG) strain measurements under the roll surface (fully embedded), which enables to evaluate contact stresses with very short computation times, compatible with real time interpretation. This elastic inverse method is analytical and relies on plane-strain and isothermal assumptions. The experimental apparatus is detailed, technical issues are clearly exposed as well as calibration procedures. Several pilot cold rolling tests have been performed at various rolling speeds and different strip thicknesses in order to demonstrate the industrial feasibility. Resulting evaluations of contact stresses are then compared with numerical simulations. Reasonable agreement is obtained for normal stress (i.e., pressure) but not for shear stress(only an order of magnitude is obtained)

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Optical Fiber Sensors from Laboratory to Field Trials: Applications and Trends at CEA LIST

Cited by 5 publications

References 8 publications

Temperature Resistant Fiber Bragg Gratings for On-Line and Structural Health Monitoring of the Next-Generation of Nuclear Reactors

Temperature Resistant Fiber Bragg Gratings for On-Line and Structural Health Monitoring of the Next-Generation of Nuclear Reactors

A new sensor for the evaluation of contact stress by inverse analysis during steel strip rolling

Experimental evaluation of contact stress during cold rolling process with optical fiber Bragg gratings sensors measurements and fast inverse method

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