Infrared radiation Induced attenuation of radiation sensitive optical fibers: influence of temperature and modal propagation

Vecchi, Gaetano Li; Francesca, Diego Di; Sabatier, C.; Girard, Sabine; Alessi, A.; Guttilla, Angela; Robin, Thierry; Kadi, Y.; Brügger, M.

doi:10.1016/j.yofte.2020.102166

Cited by 19 publications

(15 citation statements)

References 21 publications

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“…Even if these quantities are globally lower than Г 1 values, Г 2 remains largely acceptable, indicating the high mode confinement. Moreover, the simulated results are higher than those obtained for optical fibers, where values of 0.85 can be reported at 1550 nm [31]. This can be explained by the high ∆n achieved in the 10 −2 range, while values of typically 10 −3 are possible for optical fibers.…”

Section: Simulation Of the Mode Confinement: Transverse Electric (Te) Modementioning

confidence: 63%

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Sol–Gel Waveguide-Based Sensor for Structural Health Monitoring on Large Surfaces in Aerospace Domain

et al. 2021

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The potential of sol–gel-based optical sensors is investigated for applications in the aerospace domain. To this aim, a low-cost and non-intrusive sol–gel sensor based on waveguides, arranged as a 2D matrix structure, is fabricated by UV photolithography for delamination and damage detection. Two different organic–inorganic sol–gels were selected to fabricate the photonic device: TiO2–SiO2 and ZrO2–SiO2, acting as the waveguide core and the cladding, respectively. A systematic study was performed to determine the manufacturing parameters controlling their properties. The results show that large surfaces can be functionalized via sol–gel methods using the direct laser-writing approach. The structures are characterized in terms of refractive index, and the guiding properties were investigated through simulations and experiments, indicating an excellent behavior regarding the light guidance in a straight waveguide or in the 2D matrix structure grid. Additionally, preliminary tests show that the presence of impact can be easily detected after damage through the induced optical losses on large surfaces. This proof of concept sensor is a promising tool for structural health monitoring. To achieve the ultimate goal, the integration of this photonic sensor will be later performed on aircraft wings.

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Section: Simulation Of the Mode Confinement: Transverse Electric (Te) Modementioning

confidence: 63%

“…Aerospace 2021, 8, x FOR PEER REVIEW 14 of 20 than those obtained for optical fibers, where values of 0.85 can be reported at 1550 nm [31]. This can be explained by the high Δn achieved in the 10 −2 range, while values of typically 10 −3 are possible for optical fibers.…”

Section: Simulation Of the Mode Confinement: Transverse Electric (Te) Modementioning

confidence: 90%

Sol–Gel Waveguide-Based Sensor for Structural Health Monitoring on Large Surfaces in Aerospace Domain

et al. 2021

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“…In the previous study, [ 22 ] it was shown that Al‐doped fibers are more radiation sensitive than P‐doped ones. Furthermore, for the tested irradiation conditions, the temperature effect (up to 50 °C) on RIA, if present, was minor.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, we perform an extensive characterization of the NIR RIA properties of new Al‐doped fibers differing from those of the previous study. [ 22 ] In particular, we evaluated the online (data recorded during irradiation) RIA dependence on intrinsic fiber parameters, such as its core composition, its manufacturing process (drawing parameter and preform deposition process), and irradiation conditions: dose, dose rate, temperature of irradiation, and impact of successive irradiation runs. Indeed, all these parameters could affect the nature and concentration of the precursor sites that are converted under irradiation into the optically active defects causing the RIA in the IR domain.…”

Section: Introductionmentioning

confidence: 99%

Near‐IR Radiation‐Induced Attenuation of Aluminosilicate Optical Fibers

Alessi

Guttilla

Agnello

et al. 2021

Physica Status Solidi (a)

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The X‐ray radiation‐induced attenuation (RIA) growth kinetics are studied online in different single‐mode aluminosilicate optical fibers in the near‐IR (NIR) domain to evaluate their potential in terms of dosimetry. The optical fibers differ by Al contents, core sizes, drawing parameters, and also by a preform deposition process. The data show no dependence of the RIA on all these parameters, a positive result for the design of point or distributed radiation detectors exploiting RIA to monitor the dose. The RIA growth rate is unchanged for dose rates changing from 0.073 to 6.25 Gy(SiO2) s−1, and the RIA linearly increases with the dose up to 2 kGy(SiO2). Small but noticeable RIA changes are observed when the irradiation temperature increases up to 50 °C during successive irradiation runs. Such results, and the post‐irradiation RIA recovery, have to be considered for the application, as they can affect the dose measurement accuracy. Finally, the spectral analysis shows no dependence of the spectral shape on the fiber and irradiation parameters. As a consequence, the data reported at 1310 and 1550 nm give information not only for the RIA kinetics at telecommunications and sensor wavelengths but also for the whole NIR range often used fiber‐based technologies.

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“…When subjecting fiber sensors to ionizing radiation inside industrial facilities [16], several factors need to be kept under observation and considered for correction as follows. Temperature variations may prove to be one of the most important secondary effects when it comes to the real-time investigation of optical fiber grating sensors subjected to radiation [28]. By performing laboratory calibration prior to irradiation, red-or blue-shifts in grating resonance wavelengths may be found because this parameter might be dominant compared to the radiation induced effects.…”

Section: Introductionmentioning

confidence: 99%

A New Setup for Real-Time Investigations of Optical Fiber Sensors Subjected to Gamma-Rays: Case Study on Long Period Gratings

Stăncălie

Esposito

Neguţ

et al. 2020

Sensors

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In this work, we present a new setup for real-time investigations of optical fibers and optical fiber sensors while being subjected to gamma-rays. The investigation of the radiation effects on novel or well-assessed sensing devices has attracted a lot of interest, however, the facilities required to do this (when available) are barely accessible to the device to be characterized. In order to reduce the limitations of these types of experiments and ensure a highly controlled environment, we implemented a configuration that permits the on-line testing of optical components inside a Co-60 gamma chamber research irradiator. To show the advantages of this new approach, we present a case study that compares an arc-induced optical fiber long period grating (LPG) irradiated in a gamma chamber with the same type of grating irradiated with gamma-rays from a Co-60 industrial irradiator. In order to better understand the effects of radiation on such components and their behavior in radiation environments, we focus on the homogeneity of the radiation field and parameter customizability as well as the high reproducibility of the experiments.

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Infrared radiation Induced attenuation of radiation sensitive optical fibers: influence of temperature and modal propagation

Cited by 19 publications

References 21 publications

Sol–Gel Waveguide-Based Sensor for Structural Health Monitoring on Large Surfaces in Aerospace Domain

Sol–Gel Waveguide-Based Sensor for Structural Health Monitoring on Large Surfaces in Aerospace Domain

Near‐IR Radiation‐Induced Attenuation of Aluminosilicate Optical Fibers

A New Setup for Real-Time Investigations of Optical Fiber Sensors Subjected to Gamma-Rays: Case Study on Long Period Gratings

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