Femtosecond FBG Written through the Coating for Sensing Applications

Habel, Joé; Boilard, Tommy; Freniére, Jean-Simon; Trepanier, Francois; Bernier, Martin

doi:10.3390/s17112519

Cited by 84 publications

(33 citation statements)

References 39 publications

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“…(9), though strain caused due to pressure on FBG can be calculated from Eq. (14), where P is pressure, ν is poisson's ratio, and E is Modulus of elasticity: 139 E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 1 4 ; 1 1 6 ; 1 4 6…”

Section: Fbg-based Pressure Sensormentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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Fiber Bragg grating has embraced the area of fiber optics since the early days of its discovery, and most fiber optic sensor systems today make use of fiber Bragg grating technology. Researchers have gained enormous attention in the field of fiber Bragg grating (FBG)-based sensing due to its inherent advantages, such as small size, fast response, distributed sensing, and immunity to the electromagnetic field. Fiber Bragg grating technology is popularly used in measurements of various physical parameters, such as pressure, temperature, and strain for civil engineering, industrial engineering, military, maritime, and aerospace applications. Nowadays, strong emphasis is given to structure health monitoring of various engineering and civil structures, which can be easily achieved with FBG-based sensors. Depending on the type of grating, FBG can be uniform, long, chirped, tilted or phase shifted having periodic perturbation of refractive index inside core of the optical fiber. Basic fundamentals of FBG and recent progress of fiber Bragg grating-based sensors used in various applications for temperature, pressure, liquid level, strain, and refractive index sensing have been reviewed. A major problem of temperature cross sensitivity that occurs in FBG-based sensing requires temperature compensation technique that has also been discussed in this paper.

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Section: Fbg-based Pressure Sensormentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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“…In this paper, we present the manufacturing of: (i) regenerated FBGs using an electrical furnace but also an all-optical process and of (ii) femtosecond laser-written point-by-point femtosecond FBGs using infrared light (IR-fs-FBGs) through the polyimide coating of pure silica core single-mode optical fibers. The presented techniques may not only speed up the manufacturing processes but also improve the mechanical reliability of the FBGs as shown in [ 13 ] for phase mask written femtosecond FBGs. Then the temperature stability of both kinds of FBGs with regard to their reflectivity is assessed highlighting their resistance to thermal erasure.…”

Section: Introductionmentioning

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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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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“…IR fs-laser technology has a great advantage over its UV counterpart as Bragg gratings can now be inscribed in almost any optical fiber without the need to photosensitize the fiber core [21]. Moreover, if the IR fs-pulses are focused sufficiently tightly, inscription through the protective coating ('trans-jacket inscription') becomes possible [22][23][24][25][26][27][28][29]. This allows one to avoid the removal of the protective coating and, if it is needed, its reapplication after grating inscription.…”

Section: Introductionmentioning

confidence: 99%

High-temperature stable π-phase-shifted fiber Bragg gratings inscribed using infrared femtosecond pulses and a phase mask

Hnatovsky¹,

Grobnic²,

Mihailov³

2018

Opt. Express

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Type II π-phase-shifted Bragg gratings stable up to ~1000°C are written inside a standard single mode silica optical fiber (SMF-28) with infrared femtosecond pulses and a special phase mask. Inscription through the protective polyimide fiber coating is also demonstrated. The birefringence of the Bragg gratings and, as a result, the polarization dependence of their spectra are strongly affected by the femtosecond laser polarization. Using optimized writing conditions, the full width at half maximum of the π-phase-shifted passband feature can be ~30 pm in transmission, while the polarization-dependent shift of its central wavelength can be less than 8 pm, for a 7 mm long grating structure. This makes such gratings a unique tool for high-resolution measurements of temperature, load and vibration in extreme temperature environments.

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Femtosecond FBG Written through the Coating for Sensing Applications

Cited by 84 publications

References 39 publications

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

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

High-temperature stable π-phase-shifted fiber Bragg gratings inscribed using infrared femtosecond pulses and a phase mask

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