Comparison between fast neutron and gamma irradiation of optical fibres

Henschel, H.; Köhn, O.; Lennartz, W.; Metzger, Stefan; Schmidt, Hans; Rosenkranz, J.; Glessner, B.; Siebert, Bernd

doi:10.1109/23.685237

Cited by 22 publications

(5 citation statements)

References 13 publications

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“…We have observed that the radiation induced losses are higher in 10 17 n/cm 2 + > 2MGy than 10 MGy irradiated samples, even if they remain in the same order of magnitude. These findings agree with the study reported by Henschel et al, where it is shown that γ and neutron irradiations lead to the same induced losses if the fluences is <10 14 n/cm 2 whereas higher fluences of neutrons cause higher losses than γ irradiation [25].…”

Section: Discussionsupporting

confidence: 93%

Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments

Rizzolo

Boukenter

Marin

et al. 2017

IEEE Trans. Nucl. Sci.

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We report the study of a radiation resistant single mode optical fiber doped with fluorine exposed to mixed neutron and gamma-radiation up to 10(17) n/cm(2) fluence and >2 MGy dose to evaluate its performances when used as the sensing element of a distributed Optical Frequency Domain Reflectometry (OFDR). The use of complementary spectroscopic techniques highlights some differences between the responses of solely gamma-radiation (10 MGy) or mixed neutron and. (10(17) n/cm2 + >2 MGy) irradiated samples. Those differences are linked to the defect generation rather than to structural changes of the a-SiO2 host matrix. We show that a modification of the refractive index of similar to 10(-5) is induced at the highest investigated neutron fluence. However, the feasibility of distributed temperature measurements along the irradiated fiber is demonstrated with an accuracy of 0.1 degrees C over a sensing length up to similar to 130 m with the tested OBR4600 interrogator. These results are very promising for the integration of OFDR sensors in mixed neutron and gamma radiation environments

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Section: Discussionsupporting

confidence: 93%

Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments

Rizzolo

Boukenter

Marin

et al. 2017

IEEE Trans. Nucl. Sci.

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“…Gamma rays from a Co source generate mainly damage via the radiolysis effect but only a very small amount of displacement damage via secondary electrons [14]. Second, it has been reported [15]- [17] that the RIA in optical fibers from gamma rays can differ significantly from that induced by energetic neutrons. As the neutron fluence increases, the ratio of the induced loss from gamma rays and neutrons changes for the same ionising dose.…”

Section: Requirementsmentioning

confidence: 99%

Optical Absorption in Commercial Single Mode Optical Fibers in a High Energy Physics Radiation Field

Wijnands

Jonge

Kuhnhenn

et al. 2008

IEEE Trans. Nucl. Sci.

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Abstract-This paper reports on the radiation induced attenuation of light at 1310 nm and 1550 nm in 12 commercially available single mode (SM) optical fibers. The fiber samples are exposed to gamma rays from a 60 Co source and to a high energy physics radiation field. The attenuation is studied as a function of total dose, dose rate, light power and temperature. Radiation hard fibers from one manufacturer show an extraordinary low attenuation for light at 1310 nm that does not exceed 5 dB/km even after a total dose of 1 MGy. 2500 km of this type of fiber have been produced by the manufacturer and quality assurance measurements of the production batches are presently ongoing.

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“…Indeed, not only are the same defects generated independently of the radiation nature but also their concentration showed similar kinetics and levels at the same TID [ 62 ]. Nevertheless, some differences can be observed because of the dose enhancement induced by energetic proton recoils out of the H-containing coatings [ 63 ]. In addition to this effect, higher neutron fluences lead to significative structural changes, i.e., densification [ 16 ], causing new intrinsic defects or changes in the spectroscopic signatures of already known centers [ 64 ].…”

Section: Radiation Effects On Optical Fibersmentioning

confidence: 99%

Radiation Effects on Fiber Bragg Gratings: Vulnerability and Hardening Studies

Morana

Marin

Lablonde

et al. 2022

Sensors

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Fiber Bragg gratings (FBGs) are point optical fiber sensors that allow the monitoring of a diversity of environmental parameters, e.g., temperature or strain. Several research groups have studied radiation effects on the grating response, as they are implemented in harsh environments: high energy physics, space, and nuclear facilities. We report here the advances made to date in studies regarding the vulnerability and hardening of this sensor under radiation. First, we introduce its principle of operation. Second, the different grating inscription techniques are briefly illustrated as well as the differences among the various types. Then, we focus on the radiation effects induced on different FBGs. Radiation induces a shift in their Bragg wavelengths, which is a property serving to measure environmental parameters. This radiation-induced Bragg wavelength shift (RI-BWS) leads to a measurement error, whose amplitude and kinetics depend on many parameters: inscription conditions, fiber type, pre- or post-treatments, and irradiation conditions (nature, dose, dose rate, and temperature). Indeed, the radiation hardness of an FBG is not directly related to that of the fiber where it has been photo-inscribed by a laser. We review the influence of all these parameters and discuss how it is possible to manufacture FBGs with limited RI-BWS, opening the way to their implementation in radiation-rich environments.

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Comparison between fast neutron and gamma irradiation of optical fibres

Cited by 22 publications

References 13 publications

Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments

Evaluation of Distributed OFDR-Based Sensing Performance in Mixed Neutron/Gamma Radiation Environments

Optical Absorption in Commercial Single Mode Optical Fibers in a High Energy Physics Radiation Field

Radiation Effects on Fiber Bragg Gratings: Vulnerability and Hardening Studies

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