$Online optical refractive index measurement in research reactor core$
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Online optical refractive index measurement in research reactor core

There is a growing interest in fiber optic measurements for applications in radiation environments. Optical fiber sensors and diagnostics can monitor many parameters of interest inside a research reactor core. For some applications, fiber optics are combined with an optical system that collects or f...

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Autores principales:	Fourneau Gary, Agoyan Marion, Chemol Guy, Ladaci Ayoub, Maskrot Hicham, Destouches Christophe, Fourmentel Damien, Girard Sylvain, Boukenter Aziz
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	optical fiber sensor radiation-inducedattenuation interferometry radiation-induced-refractiveindex-change interferometric measurement rad-hard glasses high neutron fluence Physics QC1-999
Acceso en línea:	https://doaj.org/article/d4a6e4fc533542c1983c59df9f9b9670
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id	oai:doaj.org-article:d4a6e4fc533542c1983c59df9f9b9670
record_format	dspace
spelling	oai:doaj.org-article:d4a6e4fc533542c1983c59df9f9b96702021-12-02T17:12:46ZOnline optical refractive index measurement in research reactor core2100-014X10.1051/epjconf/202125304020https://doaj.org/article/d4a6e4fc533542c1983c59df9f9b96702021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_04020.pdfhttps://doaj.org/toc/2100-014XThere is a growing interest in fiber optic measurements for applications in radiation environments. Optical fiber sensors and diagnostics can monitor many parameters of interest inside a research reactor core. For some applications, fiber optics are combined with an optical system that collects or focuses the light beam. The Radiation-Induced-Refractive-Index-Change (RIRIC) of the used glasses appears then as major phenomenon as it is a determining value for the sensor optical function. In the framework of the development of a radiation hardened confocal chromatic sensor, we implemented an on-line refractive index measuring device in order to test in a reactor core various glasses, candidates to be implemented into the sensor. The measurement relies on interferometry, which is a challenge because of the small volume available, the impossibility to make optical adjustments once installed, and the high temperature of operation. Precisely, the quantity retrieved is the optical path (product of the length L by the optical refractive index n), when L is well known, we can deduce n. But under high neutron fluence, some variation in density can be observed. The targeted online measurement of the refractive index therefore becomes an optical path measurement. We will present the device, the principle of measurement, and the first results of some index change measurement, produced by a temperature ramp from 20 °C and 350 °C. We have obtained original data for most of the candidate glasses used to design the optical system.Fourneau GaryAgoyan MarionChemol GuyLadaci AyoubMaskrot HichamDestouches ChristopheFourmentel DamienGirard SylvainBoukenter AzizEDP Sciencesarticleoptical fiber sensorradiation-inducedattenuationinterferometryradiation-induced-refractiveindex-changeinterferometric measurementrad-hard glasseshigh neutron fluencePhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 04020 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	optical fiber sensor radiation-inducedattenuation interferometry radiation-induced-refractiveindex-change interferometric measurement rad-hard glasses high neutron fluence Physics QC1-999
spellingShingle	optical fiber sensor radiation-inducedattenuation interferometry radiation-induced-refractiveindex-change interferometric measurement rad-hard glasses high neutron fluence Physics QC1-999 Fourneau Gary Agoyan Marion Chemol Guy Ladaci Ayoub Maskrot Hicham Destouches Christophe Fourmentel Damien Girard Sylvain Boukenter Aziz Online optical refractive index measurement in research reactor core
description	There is a growing interest in fiber optic measurements for applications in radiation environments. Optical fiber sensors and diagnostics can monitor many parameters of interest inside a research reactor core. For some applications, fiber optics are combined with an optical system that collects or focuses the light beam. The Radiation-Induced-Refractive-Index-Change (RIRIC) of the used glasses appears then as major phenomenon as it is a determining value for the sensor optical function. In the framework of the development of a radiation hardened confocal chromatic sensor, we implemented an on-line refractive index measuring device in order to test in a reactor core various glasses, candidates to be implemented into the sensor. The measurement relies on interferometry, which is a challenge because of the small volume available, the impossibility to make optical adjustments once installed, and the high temperature of operation. Precisely, the quantity retrieved is the optical path (product of the length L by the optical refractive index n), when L is well known, we can deduce n. But under high neutron fluence, some variation in density can be observed. The targeted online measurement of the refractive index therefore becomes an optical path measurement. We will present the device, the principle of measurement, and the first results of some index change measurement, produced by a temperature ramp from 20 °C and 350 °C. We have obtained original data for most of the candidate glasses used to design the optical system.
format	article
author	Fourneau Gary Agoyan Marion Chemol Guy Ladaci Ayoub Maskrot Hicham Destouches Christophe Fourmentel Damien Girard Sylvain Boukenter Aziz
author_facet	Fourneau Gary Agoyan Marion Chemol Guy Ladaci Ayoub Maskrot Hicham Destouches Christophe Fourmentel Damien Girard Sylvain Boukenter Aziz
author_sort	Fourneau Gary
title	Online optical refractive index measurement in research reactor core
title_short	Online optical refractive index measurement in research reactor core
title_full	Online optical refractive index measurement in research reactor core
title_fullStr	Online optical refractive index measurement in research reactor core
title_full_unstemmed	Online optical refractive index measurement in research reactor core
title_sort	online optical refractive index measurement in research reactor core
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/d4a6e4fc533542c1983c59df9f9b9670
work_keys_str_mv	AT fourneaugary onlineopticalrefractiveindexmeasurementinresearchreactorcore AT agoyanmarion onlineopticalrefractiveindexmeasurementinresearchreactorcore AT chemolguy onlineopticalrefractiveindexmeasurementinresearchreactorcore AT ladaciayoub onlineopticalrefractiveindexmeasurementinresearchreactorcore AT maskrothicham onlineopticalrefractiveindexmeasurementinresearchreactorcore AT destoucheschristophe onlineopticalrefractiveindexmeasurementinresearchreactorcore AT fourmenteldamien onlineopticalrefractiveindexmeasurementinresearchreactorcore AT girardsylvain onlineopticalrefractiveindexmeasurementinresearchreactorcore AT boukenteraziz onlineopticalrefractiveindexmeasurementinresearchreactorcore
_version_	1718381408936787968

Online optical refractive index measurement in research reactor core

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