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Adriana Morana - One of the best experts on this subject based on the ideXlab platform.

  • radiation induced effects on fiber Bragg gratings inscribed in highly birefringent photonic crystal fiber
    IEEE Transactions on Nuclear Science, 2019
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans, A Boukenter, Y Ouerdane
    Abstract:

    The fiber Bragg gratings (FBGs) inside photonic crystal fibers (PCFs) having high fiber birefringence, such as in PCF with butterfly shape microstructure, are characterized by two Bragg peaks. The spectral distance between these two peaks is not affected by a change of temperature or by a longitudinally applied strain, but this spectral separation evolves when the sensor is subjected to a transversal strain. This makes such FBGs inscribed in highly birefringent PCFs very interesting for structural health monitoring of civil structures, as well as for operation in harsh environments such as the ones associated with the nuclear industry. In this paper, we monitor the radiation-induced Bragg Wavelength Shift (RI-BWS) of the punctual sensor and the radiation-induced attenuation in the fiber used for its inscription up to a dose of 1.5 MGy(SiO2). Even if we observe a RI-BWS for both Bragg peaks, the spectral distance between them only slightly evolves, of less than 10 pm. These gratings are then very promising sensors for the structural health monitoring of nuclear facilities.

  • Radiation-Hardened Fiber Bragg Grating Based Sensors for Harsh Environments
    IEEE Transactions on Nuclear Science, 2016
    Co-Authors: Adriana Morana, Jochen Kuhnhenn, Sylvain Girard, Emmanuel Marin, Jocelyn Périsse, J-s. Genot, G. Mélin, Laurent Lablonde, Thierry Robin, Benoit Cadier
    Abstract:

    Fiber Bragg Grating (FBG) based sensors are nowadays used for several applications, but, even if they present advantages for their incorporation into radiation environments, commercial-off-the-shelf devices cannot still be used in harsh conditions. We recently reported a procedure for fabricating FBGs resistant to severe constraints combining both high radiation doses up to MGy levels and operation temperatures exceeding 200°C (RadHard FBGs). Following these results, the European project HOBAN was granted by Kic InnoEnergy with the aim of developing and marketing FBG-based temperature and strain monitoring systems suitable for harsh nuclear environments (350°C temperature and MGy dose levels), with their associated instrumentation devices. In this framework, we present an accurate study about the robustness of the radiation-response of these RadHard FBGs against the main grating inscription parameters. Up to the accumulated X-ray dose of 1 MGy(SiO2), no significant radiation induced Bragg Wavelength Shift is observed meaning that radiations induce errors below ± 0.4°C in the temperature estimation. Moreover, a study about the dose-rate dependence (1 to 50 Gy/s) of the gratings response is also reported and confirms the high radiation hardness of our RadHard FBGs at all dose rates.

  • radiation tolerant fiber Bragg gratings for high temperature monitoring at mgy dose levels
    Optics Letters, 2014
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, C Marcandella, P Paillet, J Perisse, Jeanreynald Mace, Aziz Boukenter, M Cannas, Youcef Ouerdane
    Abstract:

    We report a method for fabricating fiber Bragg gratings (FBG) resistant to very severe environments mixing high radiation doses (up to 3 MGy) and high temperatures (up to 230°C). Such FBGs have been written in two types of radiation resistant optical fibers (pure-silica and fluorine-doped cores) by exposures to a 800 nm femtosecond IR laser at power exceeding 500 mW and then subjected to a thermal annealing treatment of 15 min at 750°C. Under radiation, our study reveals that the radiation induced Bragg Wavelength Shift (BWS) at a 3 MGy dose is strongly reduced compared to responses of FBGs written with nonoptimized conditions. The BWS remains lower than 10 pm for temperatures of irradiation ranging from 25°C to 230°C without noticeable decrease of the FBG peak amplitude. For an applicative point of view, this radiation induced BWS corresponds to an additional error on the temperature measurements lower than 1.5°C, opening the way to the development of radiation-tolerant multi-point temperature sensors for nuclear industry.

Emmanuel Marin - One of the best experts on this subject based on the ideXlab platform.

  • radiation induced effects on fiber Bragg gratings inscribed in highly birefringent photonic crystal fiber
    IEEE Transactions on Nuclear Science, 2019
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans, A Boukenter, Y Ouerdane
    Abstract:

    The fiber Bragg gratings (FBGs) inside photonic crystal fibers (PCFs) having high fiber birefringence, such as in PCF with butterfly shape microstructure, are characterized by two Bragg peaks. The spectral distance between these two peaks is not affected by a change of temperature or by a longitudinally applied strain, but this spectral separation evolves when the sensor is subjected to a transversal strain. This makes such FBGs inscribed in highly birefringent PCFs very interesting for structural health monitoring of civil structures, as well as for operation in harsh environments such as the ones associated with the nuclear industry. In this paper, we monitor the radiation-induced Bragg Wavelength Shift (RI-BWS) of the punctual sensor and the radiation-induced attenuation in the fiber used for its inscription up to a dose of 1.5 MGy(SiO2). Even if we observe a RI-BWS for both Bragg peaks, the spectral distance between them only slightly evolves, of less than 10 pm. These gratings are then very promising sensors for the structural health monitoring of nuclear facilities.

  • Radiation-Hardened Fiber Bragg Grating Based Sensors for Harsh Environments
    IEEE Transactions on Nuclear Science, 2016
    Co-Authors: Adriana Morana, Jochen Kuhnhenn, Sylvain Girard, Emmanuel Marin, Jocelyn Périsse, J-s. Genot, G. Mélin, Laurent Lablonde, Thierry Robin, Benoit Cadier
    Abstract:

    Fiber Bragg Grating (FBG) based sensors are nowadays used for several applications, but, even if they present advantages for their incorporation into radiation environments, commercial-off-the-shelf devices cannot still be used in harsh conditions. We recently reported a procedure for fabricating FBGs resistant to severe constraints combining both high radiation doses up to MGy levels and operation temperatures exceeding 200°C (RadHard FBGs). Following these results, the European project HOBAN was granted by Kic InnoEnergy with the aim of developing and marketing FBG-based temperature and strain monitoring systems suitable for harsh nuclear environments (350°C temperature and MGy dose levels), with their associated instrumentation devices. In this framework, we present an accurate study about the robustness of the radiation-response of these RadHard FBGs against the main grating inscription parameters. Up to the accumulated X-ray dose of 1 MGy(SiO2), no significant radiation induced Bragg Wavelength Shift is observed meaning that radiations induce errors below ± 0.4°C in the temperature estimation. Moreover, a study about the dose-rate dependence (1 to 50 Gy/s) of the gratings response is also reported and confirms the high radiation hardness of our RadHard FBGs at all dose rates.

  • radiation tolerant fiber Bragg gratings for high temperature monitoring at mgy dose levels
    Optics Letters, 2014
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, C Marcandella, P Paillet, J Perisse, Jeanreynald Mace, Aziz Boukenter, M Cannas, Youcef Ouerdane
    Abstract:

    We report a method for fabricating fiber Bragg gratings (FBG) resistant to very severe environments mixing high radiation doses (up to 3 MGy) and high temperatures (up to 230°C). Such FBGs have been written in two types of radiation resistant optical fibers (pure-silica and fluorine-doped cores) by exposures to a 800 nm femtosecond IR laser at power exceeding 500 mW and then subjected to a thermal annealing treatment of 15 min at 750°C. Under radiation, our study reveals that the radiation induced Bragg Wavelength Shift (BWS) at a 3 MGy dose is strongly reduced compared to responses of FBGs written with nonoptimized conditions. The BWS remains lower than 10 pm for temperatures of irradiation ranging from 25°C to 230°C without noticeable decrease of the FBG peak amplitude. For an applicative point of view, this radiation induced BWS corresponds to an additional error on the temperature measurements lower than 1.5°C, opening the way to the development of radiation-tolerant multi-point temperature sensors for nuclear industry.

Sylvain Girard - One of the best experts on this subject based on the ideXlab platform.

  • radiation induced effects on fiber Bragg gratings inscribed in highly birefringent photonic crystal fiber
    IEEE Transactions on Nuclear Science, 2019
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans, A Boukenter, Y Ouerdane
    Abstract:

    The fiber Bragg gratings (FBGs) inside photonic crystal fibers (PCFs) having high fiber birefringence, such as in PCF with butterfly shape microstructure, are characterized by two Bragg peaks. The spectral distance between these two peaks is not affected by a change of temperature or by a longitudinally applied strain, but this spectral separation evolves when the sensor is subjected to a transversal strain. This makes such FBGs inscribed in highly birefringent PCFs very interesting for structural health monitoring of civil structures, as well as for operation in harsh environments such as the ones associated with the nuclear industry. In this paper, we monitor the radiation-induced Bragg Wavelength Shift (RI-BWS) of the punctual sensor and the radiation-induced attenuation in the fiber used for its inscription up to a dose of 1.5 MGy(SiO2). Even if we observe a RI-BWS for both Bragg peaks, the spectral distance between them only slightly evolves, of less than 10 pm. These gratings are then very promising sensors for the structural health monitoring of nuclear facilities.

  • Radiation-Hardened Fiber Bragg Grating Based Sensors for Harsh Environments
    IEEE Transactions on Nuclear Science, 2016
    Co-Authors: Adriana Morana, Jochen Kuhnhenn, Sylvain Girard, Emmanuel Marin, Jocelyn Périsse, J-s. Genot, G. Mélin, Laurent Lablonde, Thierry Robin, Benoit Cadier
    Abstract:

    Fiber Bragg Grating (FBG) based sensors are nowadays used for several applications, but, even if they present advantages for their incorporation into radiation environments, commercial-off-the-shelf devices cannot still be used in harsh conditions. We recently reported a procedure for fabricating FBGs resistant to severe constraints combining both high radiation doses up to MGy levels and operation temperatures exceeding 200°C (RadHard FBGs). Following these results, the European project HOBAN was granted by Kic InnoEnergy with the aim of developing and marketing FBG-based temperature and strain monitoring systems suitable for harsh nuclear environments (350°C temperature and MGy dose levels), with their associated instrumentation devices. In this framework, we present an accurate study about the robustness of the radiation-response of these RadHard FBGs against the main grating inscription parameters. Up to the accumulated X-ray dose of 1 MGy(SiO2), no significant radiation induced Bragg Wavelength Shift is observed meaning that radiations induce errors below ± 0.4°C in the temperature estimation. Moreover, a study about the dose-rate dependence (1 to 50 Gy/s) of the gratings response is also reported and confirms the high radiation hardness of our RadHard FBGs at all dose rates.

  • radiation tolerant fiber Bragg gratings for high temperature monitoring at mgy dose levels
    Optics Letters, 2014
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, C Marcandella, P Paillet, J Perisse, Jeanreynald Mace, Aziz Boukenter, M Cannas, Youcef Ouerdane
    Abstract:

    We report a method for fabricating fiber Bragg gratings (FBG) resistant to very severe environments mixing high radiation doses (up to 3 MGy) and high temperatures (up to 230°C). Such FBGs have been written in two types of radiation resistant optical fibers (pure-silica and fluorine-doped cores) by exposures to a 800 nm femtosecond IR laser at power exceeding 500 mW and then subjected to a thermal annealing treatment of 15 min at 750°C. Under radiation, our study reveals that the radiation induced Bragg Wavelength Shift (BWS) at a 3 MGy dose is strongly reduced compared to responses of FBGs written with nonoptimized conditions. The BWS remains lower than 10 pm for temperatures of irradiation ranging from 25°C to 230°C without noticeable decrease of the FBG peak amplitude. For an applicative point of view, this radiation induced BWS corresponds to an additional error on the temperature measurements lower than 1.5°C, opening the way to the development of radiation-tolerant multi-point temperature sensors for nuclear industry.

A. Calabrò - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic strain measurements by fibre Bragg grating sensor
    Sensors and Actuators A-physical, 2004
    Co-Authors: Andrea Cusano, Antonello Cutolo, J. Nasser, Michele Giordano, A. Calabrò
    Abstract:

    Abstract In this work, we describe a fibre Bragg grating (FBG) sensing system for static and dynamic strain measurements. Low cost and simple grating-based demodulation technique has been used to interrogate the strain induced Bragg Wavelength Shift. Experimental results showing the capability of the proposed system to perform static strain measurements with 1 μe resolution and a linear response are presented. The same system was also used for dynamic strain detection. Here, a fibre grating was bonded to a piezoceramic actuator in different configurations. A laser triangulation-based system has been used as reference measurements up to 10 kHz while dynamic strain measurements by FBG have been carried out up to 50 kHz demonstrating a dynamic resolution of ≈40 ne/Hz1/2, leading to the possibility to perform high frequency detection for on-line structural health monitoring in civil, aeronautic, and aerospace applications.

Francis Berghmans - One of the best experts on this subject based on the ideXlab platform.

  • radiation induced effects on fiber Bragg gratings inscribed in highly birefringent photonic crystal fiber
    IEEE Transactions on Nuclear Science, 2019
    Co-Authors: Adriana Morana, Sylvain Girard, Emmanuel Marin, Tigran Baghdasaryan, Thomas Geernaert, Hugo Thienpont, Francis Berghmans, A Boukenter, Y Ouerdane
    Abstract:

    The fiber Bragg gratings (FBGs) inside photonic crystal fibers (PCFs) having high fiber birefringence, such as in PCF with butterfly shape microstructure, are characterized by two Bragg peaks. The spectral distance between these two peaks is not affected by a change of temperature or by a longitudinally applied strain, but this spectral separation evolves when the sensor is subjected to a transversal strain. This makes such FBGs inscribed in highly birefringent PCFs very interesting for structural health monitoring of civil structures, as well as for operation in harsh environments such as the ones associated with the nuclear industry. In this paper, we monitor the radiation-induced Bragg Wavelength Shift (RI-BWS) of the punctual sensor and the radiation-induced attenuation in the fiber used for its inscription up to a dose of 1.5 MGy(SiO2). Even if we observe a RI-BWS for both Bragg peaks, the spectral distance between them only slightly evolves, of less than 10 pm. These gratings are then very promising sensors for the structural health monitoring of nuclear facilities.

  • influence of fiber Bragg grating spectrum degradation on the performance of sensor interrogation algorithms
    Sensors, 2014
    Co-Authors: Alfredo Lamberti, Steve Vanlanduit, Ben De Pauw, Francis Berghmans
    Abstract:

    The working principle of fiber Bragg grating (FBG) sensors is mostly based on the tracking of the Bragg Wavelength Shift. To accomplish this task, different algorithms have been proposed, from conventional maximum and centroid detection algorithms to more recently-developed correlation-based techniques. Several studies regarding the performance of these algorithms have been conducted, but they did not take into account spectral distortions, which appear in many practical applications. This paper addresses this issue and analyzes the performance of four different Wavelength tracking algorithms (maximum detection, centroid detection, cross-correlation and fast phase-correlation) when applied to distorted FBG spectra used for measuring dynamic loads. Both simulations and experiments are used for the analyses. The dynamic behavior of distorted FBG spectra is simulated using the transfer-matrix approach, and the amount of distortion of the spectra is quantified using dedicated distortion indices. The algorithms are compared in terms of achievable precision and accuracy. To corroborate the simulation results, experiments were conducted using three FBG sensors glued on a steel plate and subjected to a combination of transverse force and vibration loads. The analysis of the results showed that the fast phase-correlation algorithm guarantees the best combination of versatility, precision and accuracy.