SIST EN IEC 60793-1-54:2018
(Main)Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation (IEC 60793-1-54:2018)
Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation (IEC 60793-1-54:2018)
This document outlines a method for measuring the steady state response of optical fibres
and optical cables exposed to gamma radiation. It can be employed to determine the level of
radiation-induced attenuation produced in Class B single-mode or Class A, category A1 and
A2 multimode optical fibres, in either cabled or uncabled form, due to exposure to gamma
radiation.
The attenuation of cabled and uncabled optical fibres generally increases when exposed to
gamma radiation. This is primarily due to the trapping of radiolytic electrons and holes at
defect sites in the glass (i.e. the formation of "colour centres"). This test procedure focuses on
two regimes of interest: the low dose rate regime suitable for estimating the effect of
environmental background radiation, and the high dose rate regime suitable for estimating the
effect of adverse nuclear environments. The testing of the effects of environmental
background radiation is achieved with an attenuation measurement approach similar to
IEC 60793-1-40 method A, cut-back. The effects of adverse nuclear environments are tested
by monitoring the power before, during and after exposure of the test sample to gamma
radiation. The depopulation of colour centres by light (photo bleaching) or by heat causes
recovery (lessening of radiation induced attenuation). Recovery can occur over a wide range
of time which depends on the irradiation time and annealing temperature. This complicates
the characterization of radiation induced attenuation since the attenuation depends on many
variables including the temperature of the test environment, the configuration of the sample,
the total dose and the dose rate applied to the sample and the light level used to measure it.
This test is not a material test for the non-optical material components of a fibre optic cable. If
degradation of cable materials exposed to irradiation is studied, other test methods will be
used.
This test method is written to contain a clear, concise listing of instructions. The background
knowledge that is necessary to perform correct, relevant and expressive irradiation tests as
well as to limit measurement uncertainty is presented separately in IEC TR 62283.
Lichtwellenleiter - Teil 1-54: Messmethoden und Prüfverfahren - Radioaktive Strahlung (IEC 60793-1-54:2018)
Fibres optiques - Partie 1-54: Méthodes de mesure et procédures d'essai - Irradiation gamma (IEC 60793-1-54:2018)
NEW!IEC 60793-1-54:2018 est disponible sous forme de IEC 60793-1-54:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60793-1-54:2018 présente une méthode de mesure de la réponse en régime permanent des fibres optiques et câbles optiques exposés au rayonnement gamma. Elle peut être utilisée pour déterminer le niveau d'affaiblissement induit par le rayonnement produit dans les fibres optiques unimodales de Classe B ou multimodales de Classe A, catégories A1 et A2, sous forme câblée ou non câblée, du fait d'une exposition au rayonnement gamma. L'affaiblissement des fibres optiques câblées et non câblées augmente généralement en cas d’exposition au rayonnement gamma. Cela est essentiellement dû au piégeage des électrons radiolytiques et des trous aux emplacements présentant des défauts dans le verre (c’est-à-dire la formation de "centres de couleurs"). La présente procédure d'essai porte sur deux régimes intéressants: le régime de débit de dose faible adapté pour l’estimation de l’effet du rayonnement de l'environnement général, et le régime de débit de dose élevé pour l’estimation de l'effet d’environnements nucléaires hostiles. Les essais portant sur les effets du rayonnement de l'environnement général sont effectués par le biais d’une mesure d'affaiblissement similaire à l'IEC 60793-1-40, méthode A, fibre coupée. Les effets d'environnements nucléaires hostiles sont soumis à essai en surveillant la puissance avant, pendant et après exposition de l’échantillon d'essai au rayonnement gamma. La dépopulation des centres de couleurs par la lumière (photodécoloration) ou par la chaleur provoque une régénération (diminution d’affaiblissement induit par le rayonnement). La régénération peut se produire sur une large plage de temps qui dépend du temps d’irradiation et de la température de recuit. Cela complique la caractérisation de l'affaiblissement induit par le rayonnement, étant donné que l'affaiblissement dépend de nombreuses variables, dont la température de l'environnement d'essai, la configuration de l'échantillon, la dose totale et le débit de dose appliqués à l'échantillon et le niveau de lumière utilisé pour le mesurer. Le présent essai n’est pas un essai de matériau pour les composants de matériaux non optiques d’un câble à fibres optiques. Si la dégradation des matériaux de câble exposés à l’irradiation est étudiée, d’autres méthodes d’essai sont alors utilisées. Cette méthode d'essai est rédigée de façon à contenir une énumération claire et concise des instructions. La connaissance du contexte qui est nécessaire pour réaliser correctement les essais d'irradiation appropriés et expressifs et pour limiter l'incertitude de mesure est traitée indépendamment dans l'IEC TR 62283. Cette troisième édition annule et remplace la deuxième édition parue en 2012. Cette édition constitue une révision technique. La présente édition contient les modifications techniques majeures suivantes par rapport à l'édition précédente:
- les conditions d'essais relatives à la photodécoloration ont été modifiées;
- la longueur d'essai a été modifiée pour obtenir un affaiblissement induit total dans l'échantillond'essai compris entre 3 dB et 10 dB à la fin de l'irradiation.
Mots-clés: fibres optiques et câbles optiques exposés au rayonnement gamma
Optična vlakna - 1-54. del: Metode merjenja in preskusni postopki - Gama sevanje (IEC 60793-1-54:2018)
Ta dokument določa metodo za merjenje odziva v stacionarnem stanju optičnih vlaken in optičnih kablov, izpostavljenih gama sevanju. Uporablja se za določanje ravni slabljenja pod vplivom sevanja, ki nastaja v enorodnih optičnih vlaknih razreda B ali večrodnih optičnih vlaknih razreda A, kategorije A1 ali A2, ki so kablirana ali nekablirana, zaradi izpostavljenosti gama sevanju.
Slabljenje optičnih vlaken, ki so kablirana ali nekablirana, se na splošno poveča, če so vlakna izpostavljena gama sevanju. Do tega pride predvsem zaradi zajetja radiolitskih elektronov in lukenj na poškodovanih mestih v steklu (npr. nastajanje »barvnih centrov«). Preskusni postopek se osredotoča na dva režima: režim z nizkim pretokom doze, ki je primeren za določanje učinka radioaktivnega sevanja ozadja v okolju, in režim z visokim pretokom doze, ki je primeren za določanje učinka škodljivih jedrskih okolij. Preskušanje učinkov radioaktivnega sevanja ozadja v okolju se izvaja z načinom merjenja slabljenja, ki je podoben metodi A iz standarda IEC 60793-1-40, tj. rezanje. Učinki škodljivih jedrskih okolij se preskušajo s spremljanjem moči pred, med in po izpostavljenosti preskusnega vzorca gama sevanju. Praznjenje barvnih centrov s svetlobo (bledenje fluorescence) ali toploto povzroči obnovitev (zmanjšanje slabljenja pod vplivom sevanja). Do obnovitve lahko pride v različnem času, kar je odvisno od časa obsevanja in temperature žarjenja. S tem postane karakterizacija slabljenja pod vplivom sevanja zapletena, saj je slabljenje odvisno od številnih spremenljivk, npr. temperature preskusnega okolja, oblike vzorca, skupne doze in doze, uporabljene za vzorec, ter ravni svetlobe za meritev. Preskus ni preskus materialov za neoptične materialne sestavne dele optičnega kabla. Za preskušanje staranja materialov kabla, izpostavljenih obsevanju, se uporabljajo druge metode.
Ta preskusna metoda vsebuje jasen in jedrnat seznam navodil. Osnovno znanje, potrebno za izvajanje pravilnih, ustreznih in ekspresivnih preskusov obsevanja ter za omejitev merilne negotovosti, je predstavljeno posebej v standardu IEC TR 62283.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lichtwellenleiter - Teil 1-54: Messmethoden und Prüfverfahren - Radioaktive Strahlung (IEC 60793-1-54:2018)Fibres optiques - Partie 1-54: Méthodes de mesure et procédures d'essai - Irradiation gamma (IEC 60793-1-54:2018)Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation (IEC 60793-1-54:2018)33.180.10Fibres and cables17.240Merjenje sevanjaRadiation measurementsICS:Ta slovenski standard je istoveten z:EN IEC 60793-1-54:2018SIST EN IEC 60793-1-54:2018en01-maj-2018SIST EN IEC 60793-1-54:2018SLOVENSKI
STANDARDSIST EN 60793-1-54:20131DGRPHãþD
SIST EN IEC 60793-1-54:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 60793-1-54
March 2018 ICS 33.180.10
Supersedes
EN 60793-1-54:2013
English Version
Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation (IEC 60793-1-54:2018)
Fibres optiques - Partie 1-54: Méthodes de mesure et procédures d'essai - Irradiation gamma (IEC 60793-1-54:2018)
Lichtwellenleiter - Teil 1-54: Messmethoden und Prüfverfahren - Gammastrahlung (IEC 60793-1-54:2018) This European Standard was approved by CENELEC on 2018-02-16. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,
B-1040 Brussels © 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60793-1-54:2018 E SIST EN IEC 60793-1-54:2018
EN IEC 60793-1-54:2018 (E) 2 European foreword The text of document 86A/1833/FDIS, future edition 3 of IEC 60793-1-54, prepared by IEC/SC 86A "Fibres and cables, of IEC technical committee 86: Fibre optics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 60793-1-54:2018.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-11-16 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2021-02-16
This document supersedes EN 60793-1-54:2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice The text of the International Standard IEC 60793-1-54:2018 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60793-2-10 NOTE Harmonized as EN 60793-2-10. IEC 60793-2-20 NOTE Harmonized as EN 60793-2-20. IEC 60793-2-50 NOTE Harmonized as EN 60793-2-50. SIST EN IEC 60793-1-54:2018
EN IEC 60793-1-54:2018 (E) 3 Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1
Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
NOTE 2
Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu.
Publication Year Title EN/HD Year IEC 60793-1-40 -
Optical fibres -- Part 1-40: Measurement methods and test procedures - Attenuation EN 60793-1-40 -
IEC 60793-1-44 -
Optical fibres -- Part 1-44: Measurement methods and test procedures - Cut-off wavelength EN 60793-1-44 -
IEC 60793-1-46 -
Optical fibres -- Part 1-46: Measurement methods and test procedures - Monitoring of changes in optical transmittance EN 60793-1-46 -
IEC 61280-4-1 -
Fibre optic communication subsystem test procedures -- Part 4-1: Installed cable plant - Multimode attenuation measurement EN 61280-4-1 -
SIST EN IEC 60793-1-54:2018
SIST EN IEC 60793-1-54:2018
IEC 60793-1-54 Edition 3.0 2018-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical fibres –
Part 1-54: Measurement methods and test procedures – Gamma irradiation
Fibres optiques –
Partie 1-54: Méthodes de mesure et procédures d'essai – Irradiation gamma
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 33.180.10
ISBN 978-2-8322-5209-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN IEC 60793-1-54:2018
– 2 – IEC 60793-1-54:2018 © IEC 2018 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Apparatus . 7 4.1 General . 7 4.2 Radiation source . 7 4.2.1 Testing of environmental background radiation . 7 4.2.2 Testing of adverse nuclear environments . 7 4.3 Optical source . 7 4.4 Optical filters/monochromators . 7 4.5 Cladding mode stripper . 7 4.6 Fibre support and positioning apparatus . 7 4.7 Optical splitter . 7 4.8 Input launch conditions . 7 4.8.1 Class A, Category A1 fibres (graded index multimode fibres) . 7 4.8.2 Class A, Category A2 fibres (quasi-step and step index fibres) . 8 4.8.3 Class B fibres (single-mode fibres) . 8 4.9 Detector – Signal detection electronics . 8 4.10 Optical power meter . 8 4.11 Radiation dosimeter . 8 4.12 Temperature-controlled container . 8 4.13 Test reel . 8 5 Sampling and specimens . 8 5.1 Specimens . 8 5.1.1 Fibre specimen . 8 5.1.2 Cable specimen . 8 5.2 Test sample length. 8 5.3 Test reel . 9 5.4 Ambient light shielding . 9 6 Procedure . 9 6.1 General . 9 6.2 Calibration of radiation source . 9 6.3 Preparation and pre-conditioning . 9 6.4 Attenuation measurement for environmental background radiation . 9 6.5 Attenuation measurement for adverse nuclear environment . 10 7 Calculations . 10 7.1 Change in optical attenuation ûa (environmental background radiation test) . 10 7.2 Change in optical transmittance, a (adverse nuclear environmental radiation test) . 10 7.3 Normalisation of the results . 11 8 Results . 11 8.1 Information to be provided with each measurement . 11 8.2 Information available upon request . 11 9 Specification information . 12 SIST EN IEC 60793-1-54:2018
IEC 60793-1-54:2018 © IEC 2018 – 3 –
Bibliography . 13
SIST EN IEC 60793-1-54:2018
– 4 – IEC 60793-1-54:2018 © IEC 2018 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
OPTICAL FIBRES –
Part 1-54: Measurement methods and test procedures –
Gamma irradiation
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60793-1-54 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) test conditions related to photobleaching have been changed; b) the test length has been modified to yield a total induced attenuation in the test sample at the end of the irradiation between 3 dB and 10 dB. SIST EN IEC 60793-1-54:2018
IEC 60793-1-54:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents: FDIS Report on voting 86A/1833/FDIS 86A/1848/RVD
Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can be found on the IEC website. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific document. At this date, the document will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.
SIST EN IEC 60793-1-54:2018
– 6 – IEC 60793-1-54:2018 © IEC 2018 OPTICAL FIBRES –
Part 1-54: Measurement methods and test procedures –
Gamma irradiation
1 Scope This document outlines a method for measuring the steady state response of optical fibres and optical cables exposed to gamma radiation. It can be employed to determine the level of radiation-induced attenuation produced in Class B single-mode or Class A, category A1 and A2 multimode optical fibres, in either cabled or uncabled form, due to exposure to gamma radiation. The attenuation of cabled and uncabled optical fibres generally increases when exposed to gamma radiation. This is primarily due to the trapping of radiolytic electrons and holes at defect sites in the glass (i.e. the formation of "colour centres"). This test procedure focuses on two regimes of interest: the low dose rate regime suitable for estimating the effect of environmental background radiation, and the high dose rate regime suitable for estimating the effect of adverse nuclear environments. The testing of the effects of environmental background radiation is achieved with an attenuation measurement approach similar to IEC 60793-1-40 method A, cut-back. The effects of adverse nuclear environments are tested by monitoring the power
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