Design of a radiation-hard optical fiber Bragg grating temperature sensor

Gusarov, A.; Starodubov, D.S.; Berghmans, Francis; Deparis, Olivier; Defosse, Y.; Fernández, Alberto; Decréton, M.; Mégret, Patrice; Blondel, M.

doi:10.1117/12.373284

Cited by 22 publications

(23 citation statements)

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“…Irradiation studies on FBGs written into different types of fibre material, including nitrogen-doped fibres which have been shown to be radiation hard with respect to attenuation losses, have been carried out previously [15,16] . These studies report that FBGs generally show a small but rapid increase of the Bragg wavelength at the beginning of the irradiation in the order of 20 to 100pm depending on the fibre and photosensitisation, with the shift saturating after a dose of typically 80 kGy [17,18] .…”

Section: Ionizing Radiation Interaction With Fibres and Fbgsmentioning

confidence: 99%

“…The overall assembly was placed in a sealed and N 2 purged container which can be lowered into the radiation zone inside a cooling water pool. The sample holder containing the FBGs was actively temperature stabilised at 55°C in order to compensate for ambient temperature changes and gamma radiation heating of the FBG holder [17] . Temperature stabilisation of the sample mount was better than ±0.2 0 C over the whole irradiation period with a 0.6 0 C rise during the first 3 hours due to radiation heating.…”

Section: Fibre Bragg Gratings Under Investigationmentioning

confidence: 99%

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Fiber Bragg gratings of type I in SMF-28 and B/Ge fibre and type IIA B/Ge fibre under gamma radiation up to 0.54 MGy

Maier¹,

MacPherson²,

Barton³

et al. 2005

SPIE Proceedings

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Section: Ionizing Radiation Interaction With Fibres and Fbgsmentioning

confidence: 99%

Section: Fibre Bragg Gratings Under Investigationmentioning

confidence: 99%

Fiber Bragg gratings of type I in SMF-28 and B/Ge fibre and type IIA B/Ge fibre under gamma radiation up to 0.54 MGy

Maier¹,

MacPherson²,

Barton³

et al. 2005

SPIE Proceedings

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“…A different behavior of FBGs under radiation was observed in recent yvr experiments 6,7 . For a Ge-doped photosensitive fibre (AT&T Accutheter 120) a shift of about 20 pm towards the red was observed 6 .…”

mentioning

confidence: 68%

“…It was found that such treatment increases also the sensitivity of FBGs to gamma-radiation 8 . It was found that such treatment increases also the sensitivity of FBGs to gamma-radiation 8 .…”

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confidence: 99%

Effect of combined gamma-neutron radiation on multiplexed fiber Bragg grating sensors

Gusarov

Fernández²,

Berghmans

et al. 2000

SPIE Proceedings

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67TUS68UOptical fiber technology is considered now for communication and sensing applications in various radiation environments, like space and nuclear industry. We report on results from an on-going experimental program, which aims at using multiplexed Fiber Bragg gratings (FBGs), essential photonic components, for in-pile temperature monitoring in a nuclear reactor. To the best of our knowledge, its is the first time that multiplexed FBG-sensors are used in such conditions..H\ZRUGV Radiation effects, photonic components, optical fiber sensors, fiber Bragg gratings ÃDIUSP9V8UDPI Optical fibre sensors (OFS) are developed to replace conventional electro-mechanical sensing systems. The advantages of OFS include immunity to electromagnetic interference, intrinsic safety, mechanical simplicity, small size, a possibly high sensitivity, multiplexing capabilities, and remote interrogation. These features make OFS an interesting alternative for application in nuclear industry. However, the necessary safety regulations make nuclear industry very conservative. In contrast to electro-mechanical sensors, which are well established, have proven their reliability and can be manufactured at known cost, the reliability of OFS is still an issue. As a result, the number of practical implementations of OFS in nuclear environments remains very limited. The main goal of our experimental study is to asses the radiation hardness of a particular type of OFS -fibre Bragg grating-based sensors. !Ã768FBSPVI9)ÃS69D6UDPIÃ@AA@8UTÃPIÃA7BThe most obvious effect of radiation action on an optical fibre is an increase of the attenuation 1 . It was recently demonstrated that failure of commercial-off-the-shelf optical fibre sensors under radiation is related to this induced attenuation and the sensors have to be redesigned to withstand radiation 2 . The advantage of a FBG-sensor is that the information about the measured parameter is encoded in a narrow band (1-2 nm) and, therefore, should be insensitive to broad-band (bandwidth > 100 nm) radiation-induced losses.A FBG is an all-fiber device, which originates from a periodic fiber index modulation. Such periodic modulation may couple different waveguide modes, and in particular forward and backward propagating modes in a single-mode fibre thus resulting in reflection. The reflection spectrum is peaked around the Bragg wavelength λ B , defined by the Bragg condition: λ B = 2n eff Λ, where n eff is the refractive index of the guided mode and Λ is the grating pitch. The use of a FBG as a sensor is 1

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“…No difference in fabrication of gratings in standard and pre-irradiated fiber could be observed. Grating pre-irradiation may increase its -radiation stability [8]. To check if that remains true for mixed -n radiation G10 was irradiated after fabrication up to a 1.6 MGy dose.…”

Section: Methodsmentioning

confidence: 99%

Long-Term Exposure of Fiber Bragg Gratings in the BR1 Low-Flux Nuclear Reactor

Gusarov

2010

IEEE Trans. Nucl. Sci.

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We report the results of a long-term exposure of fiber Bragg gratings in the BR1 low-flux nuclear reactor at SCK CEN in Mol, Belgium. Gratings fabricated in the photosensitive and the standard fibers were installed in February 2000 in a research channel of the reactor and remained there until August 2008. During this time the reactor was operational 4690h so that the gratings received a total thermal/fast neutron fluence 16 9 1 47 10 17 n/cm 2 , and a gamma-dose 10 MGy. The temperature cycled from 10 to 80 C. All the gratings were easily detectable at the end of the experiment. After more than eight years exposure the amplitude and the shape of the gratings spectra remained unchanged for fibers devoid of hydrogen loading, while FBGs fabricated using hydrogen loading did exhibit moderate changes. The results show that fiber Bragg gratings indeed have potential for long-term temperature monitoring in nuclear installations.Index Terms-Fiber Bragg gratings, optical fiber nuclear radiation effects, radiation-induced Bragg wavelength shift.

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Design of a radiation-hard optical fiber Bragg grating temperature sensor

Cited by 22 publications

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Fiber Bragg gratings of type I in SMF-28 and B/Ge fibre and type IIA B/Ge fibre under gamma radiation up to 0.54 MGy

Fiber Bragg gratings of type I in SMF-28 and B/Ge fibre and type IIA B/Ge fibre under gamma radiation up to 0.54 MGy

Effect of combined gamma-neutron radiation on multiplexed fiber Bragg grating sensors

Long-Term Exposure of Fiber Bragg Gratings in the BR1 Low-Flux Nuclear Reactor

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