Enhanced Temperature $({\sim}{800}^{\circ}{\rm C})$ Stability of Type-IIa FBG Written by 255 nm Beam

Prakash, Om; Kumar, Jitendra; Mahakud, R.; Agrawal, Sachin; Dixit, S. K.; Nakhe, S. V.

doi:10.1109/lpt.2013.2289967

Cited by 21 publications

(13 citation statements)

References 14 publications

(25 reference statements)

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“…However, conventional type-I FBGs exhibiting a strong decay at high temperatures can only operate in principle up to 300 °C for lengthy periods [5]. Many of research efforts have been expended towards the investigation of thermally stable gratings at high temperatures, including formation of type-I n (type-IIA) gratings [6,7] and type-II gratings [8], writing by femtosecond lasers [9], formation of surface relief FBGs [10], and tailoring of glass composition [11,12,13]. In the past decade, another variant, regenerated fiber Bragg gratings (RFBGs), with superior high-temperature stability has been found and considered as the essential potential for high-temperature applications [14,15].…”

Section: Introductionmentioning

confidence: 99%

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

Zhou

et al. 2017

Sensors

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Local strain measurements are considered as an effective method for structural health monitoring of high-temperature components, which require accurate, reliable and durable sensors. To develop strain sensors that can be used in higher temperature environments, an improved metal-packaged strain sensor based on a regenerated fiber Bragg grating (RFBG) fabricated in hydrogen (H2)-loaded boron–germanium (B–Ge) co-doped photosensitive fiber is developed using the process of combining magnetron sputtering and electroplating, addressing the limitation of mechanical strength degradation of silica optical fibers after annealing at a high temperature for regeneration. The regeneration characteristics of the RFBGs and the strain characteristics of the sensor are evaluated. Numerical simulation of the sensor is conducted using a three-dimensional finite element model. Anomalous decay behavior of two regeneration regimes is observed for the FBGs written in H2-loaded B–Ge co-doped fiber. The strain sensor exhibits good linearity, stability and repeatability when exposed to constant high temperatures of up to 540 °C. A satisfactory agreement is obtained between the experimental and numerical results in strain sensitivity. The results demonstrate that the improved metal-packaged strain sensors based on RFBGs in H2-loaded B–Ge co-doped fiber provide great potential for high-temperature applications by addressing the issues of mechanical integrity and packaging.

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Section: Introductionmentioning

confidence: 99%

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

Zhou

et al. 2017

Sensors

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“…Another group of FBG structures are type IIA grids. Their temperature resistance fluctuates within 500°C, yet they are characterized by the highest temperature sensitivity from all types of meshes, taking into account stresses [19,41].…”

Section: Uniform and Chirp Grids As Transducers For Temperature And Smentioning

confidence: 99%

Analysis of Metrological Properties Fiber Bragg Gratings With a Constant and Variable Period

Zieliński

Kisała

2018

IAPGOŚ

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The paper presents periodic structures in terms of metrological properties in the distinction for a fiber Bragg grating (FBG) with a constant and changeable period. The process of their formation and characteristics as well as applications in many areas have been described. On the basis of the literature, the results of research and measurements of measurable quantities such as temperature and stress made by periodic structures applied to the fiber of the optical fiber are presented. Analysis of the presented measurements allowed to mark the ranges and accuracy of measurements of individual applications.

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“…Negative index modulation was considered to be responsible for the formation of the P-PSFBG and could be employed to fabricate FBGs with excellent spectral properties as well as enhanced thermal stability. Moreover, to our knowledge, the negative-index type IIA gratings reported until now were all fabricated by UV laser exposure 10 11 12 13 14 15 16 17 18 , whereas the 800 nm NIR femtosecond laser has never been reported to successfully create such a negative-index grating formed by type IIA photosensitivity.…”

mentioning

confidence: 93%

“…However, type II gratings always have poor spectral shapes and relatively larger insertion loss 3 . Type IIA FBGs with negative index modulation are inscribed in H 2 -free fibres by UV overexposure 10 11 12 13 14 15 16 or thermal regeneration 17 18 . The formation of type IIA FBGs is associated with reduced axial stress, and these gratings can withstand temperatures up to 800 °C 13 14 .…”

mentioning

confidence: 99%

“…Type IIA FBGs with negative index modulation are inscribed in H 2 -free fibres by UV overexposure 10 11 12 13 14 15 16 or thermal regeneration 17 18 . The formation of type IIA FBGs is associated with reduced axial stress, and these gratings can withstand temperatures up to 800 °C 13 14 . Regenerated FBGs are created by thermal treatment of the original UV-inscribed type I gratings in H 2 -loaded fibres 3 8 9 19 20 21 22 23 .…”

mentioning

confidence: 99%

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Negative-index gratings formed by femtosecond laser overexposure and thermal regeneration

He¹,

Wang²,

Liao³

et al. 2016

Sci Rep

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We demonstrate a method for the preparation of negative-index fibre Bragg gratings (FBGs) using 800 nm femtosecond laser overexposure and thermal regeneration. A positive-index type I-IR FBG was first inscribed in H2-free single-mode fibre using a femtosecond laser directed through a phase mask, and then a highly polarization dependant phase-shifted FBG (P-PSFBG) was fabricated from the type I-IR FBG by overexposure to the femtosecond laser. Subsequently, the P-PSFBG was thermally annealed at 800 °C for 12 hours. Grating regeneration was observed during thermal annealing, and a negative-index FBG was finally obtained with a high reflectivity of 99.22%, an ultra-low insertion loss of 0.08 dB, a blueshift of 0.83 nm in the Bragg wavelength, and an operating temperature of up to 1000 °C for more than 10 hours. Further annealing tests showed that the thermal stability of the negative-index FBG was lower than that of a type II-IR FBG, but much higher than that of a type I-IR FBG. Moreover, the formation of such a negative-index grating may result from thermally regenerated type IIA photosensitivity.

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Enhanced Temperature $({\sim}{800}^{\circ}{\rm C})$ Stability of Type-IIa FBG Written by 255 nm Beam

Cited by 21 publications

References 14 publications

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

Analysis of Metrological Properties Fiber Bragg Gratings With a Constant and Variable Period

Negative-index gratings formed by femtosecond laser overexposure and thermal regeneration

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