SIST EN 60793-1-54:2013
(Main)Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation (IEC 60793-1-54:2012)
Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation (IEC 60793-1-54:2012)
This part of IEC 60793 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 may 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 to be studied, other test methods will be required. 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. Attention is drawn to the fact that strict regulations and suitable protective facilities are to be adopted in the laboratory for this test. Carefully selected trained personnel shall be used to perform this test. It can be extremely hazardous to test personnel if it is improperly performed or without qualified conditions.
Lichtwellenleiter - Teil 1-54: Messmethoden und Prüfverfahren - Radioaktive Strahlung (IEC 60793-1-54:2012)
Fibres optiques - Partie 1-54: Méthodes de mesure et procédures d'essai - Irradiation gamma (CEI 60793-1-54:2012)
La CEI 60793-1-54:2012 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. Cette deuxième édition annule et remplace la première édition publiée en 2003. Elle constitue une révision technique. La présente édition contient les changements techniques significatifs suivants par rapport à l'édition précédente: les conditions d'injection et les sources optiques ont été revues et sont mieux définies.
Mots clés: rayonnement gamma, fibres optiques, câbles optiques
Optična vlakna - 1-54. del: Metode merjenja in preskusni postopki - Gama sevanje (IEC 60793-1-54:2012)
Ta del standarda IEC 60793 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, podobnim 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. Splošno znanje, potrebno za izvajanje pravilnih, ustreznih in ekspresivnih preskusov obsevanja ter za omejitev merilne negotovosti, je predstavljeno posebej v standardu IEC/TR 62283. Opozoriti je treba na dejstvo, da je treba za ta preskus v laboratoriju sprejeti stroge predpise in primerne zaščitne naprave. Ta preskus izvaja skrbno izbrano usposobljeno osebje. Preskus je lahko zelo nevaren za osebje, če se izvaja nepravilno ali brez kvalificiranih pogojev.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60793-1-54:2013
01-marec-2013
1DGRPHãþD
SIST EN 60793-1-54:2004
2SWLþQDYODNQDGHO 0HWRGHPHUMHQMDLQSUHVNXVQLSRVWRSNL*DPDVHYDQMH
,(&
Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma
irradiation (IEC 60793-1-54:2012)
Lichtwellenleiter - Teil 1-54: Messmethoden und Prüfverfahren - Radioaktive Strahlung
(IEC 60793-1-54:2012)
Fibres optiques - Partie 1-54: Méthodes de mesure et procédures d'essai - Irradiation
gamma (CEI 60793-1-54:2012)
Ta slovenski standard je istoveten z: EN 60793-1-54:2013
ICS:
17.240 Merjenje sevanja Radiation measurements
33.180.10 2SWLþQD YODNQDLQNDEOL Fibres and cables
SIST EN 60793-1-54:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60793-1-54:2013
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SIST EN 60793-1-54:2013
EUROPEAN STANDARD
EN 60793-1-54
NORME EUROPÉENNE
January 2013
EUROPÄISCHE NORM
ICS 33.180.10 Supersedes EN 60793-1-54:2003
English version
Optical fibres -
Part 1-54: Measurement methods and test procedures -
Gamma irradiation
(IEC 60793-1-54:2012)
Fibres optiques - Lichtwellenleiter -
Partie 1-54: Méthodes de mesure Teil 1-54: Messmethoden
et procédures d'essai - und Prüfverfahren -
Irradiation gamma Radioaktive Strahlung
(CEI 60793-1-54:2012) (IEC 60793-1-54:2012)
This European Standard was approved by CENELEC on 2012-11-29. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60793-1-54:2013 E
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SIST EN 60793-1-54:2013
EN 60793-1-54:2013 - 2 -
Foreword
The text of document 86A/1413/CDV, future edition 2 of IEC 60793-1-54, prepared by SC 86A "Fibres
and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60793-1-54:2013.
The following dates are fixed:
• latest date by which the document has (dop) 2013-08-29
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-11-29
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60793-1-54:2003.
EN 60793-1-54:2013 includes the following significant technical changes with respect to
EN 60793-1-54:2003:
- launching conditions and optical sources have been reviewed and are better defined.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60793-1-54:2012 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 Harmonised as EN 60793-2-10.
IEC 60793-2-20 NOTE Harmonised as EN 60793-2-20.
IEC 60793-2-50 NOTE Harmonised as EN 60793-2-50.
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SIST EN 60793-1-54:2013
- 3 - EN 60793-1-54:2013
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60793-1-40 - Optical fibres - EN 60793-1-40 -
Part 1-40: Measurement methods and test
procedures - Attenuation
IEC 60793-1-44 - Optical fibres - EN 60793-1-44 -
Part 1-44: Measurement methods and test
procedures - Cut-off wavelength
IEC 60793-1-46 - Optical fibres - EN 60793-1-46 -
Part 1-46: Measurement methods and test
procedures - Monitoring of changes in optical
transmittance
IEC 61280-4-1 - Fibre optic communication subsystem test EN 61280-4-1 -
procedures -
Part 4-1: Installed cable plant - Multimode
attenuation measurement
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SIST EN 60793-1-54:2013
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SIST EN 60793-1-54:2013
IEC 60793-1-54
®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
Optical fibres –
Part 1-54: Measurement methods and test procedures – Gamma irradiation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
M
ICS 33.180.10 ISBN 978-2-83220-400-9
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
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SIST EN 60793-1-54:2013
– 2 – 60793-1-54 © IEC:2012(E)
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Apparatus . 6
3.1 Radiation source . 6
3.1.1 Testing of environmental background radiation . 6
3.1.2 Testing of adverse nuclear environments . 6
3.2 Optical source . 6
3.3 Optical filters/monochromators . 6
3.4 Cladding mode stripper . 6
3.5 Fibre support and positioning apparatus . 6
3.6 Optical splitter . 6
3.7 Input launch conditions . 7
3.7.1 Class A, category A1 fibres (graded index multimode fibres) . 7
3.7.2 Class B fibres (single-mode fibres) . 7
3.7.3 Class A, category A2 fibres (quasi-step and step index fibres) . 7
3.8 Detector – Signal detection electronics . 7
3.9 Optical power meter . 7
3.10 Radiation dosimeter . 7
3.11 Temperature controlled container . 7
3.12 Test reel . 7
4 Sampling and specimens . 7
4.1 Specimens . 7
4.1.1 Fibre specimen . 7
4.1.2 Cable specimen . 8
4.2 Specimen for environmental background radiation test . 8
4.3 Specimen for testing adverse nuclear environments . 8
4.4 Test reel . 8
4.5 Ambient light shielding . 8
5 Procedure. 8
5.1 General . 8
5.2 Calibration of radiation source . 8
5.3 Preparation and pre-conditioning . 8
5.4 Attenuation measurement for environmental background radiation . 9
5.5 Attenuation measurement for adverse nuclear environment . 9
6 Calculations . 10
6.1 Change in optical attenuation ∆a (environmental background radiation test) . 10
6.2 Change in optical transmittance, a (adverse nuclear environmental radiation
test) . 10
6.3 Normalization of the results . 10
7 Results . 11
7.1 Information to be provided with each measurement . 11
7.2 Information available upon request . 11
8 Specification information . 11
Bibliography . 12
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SIST EN 60793-1-54:2013
60793-1-54 © IEC:2012(E) – 3 –
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 second edition cancels and replaces the first edition, published in 2003. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– launching conditions and optical sources have been reviewed and are better defined.
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SIST EN 60793-1-54:2013
– 4 – 60793-1-54 © IEC:2012(E)
The text of this standard is based on the following documents:
CDV Report on voting
86A/1413/CDV 86A/1433/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60793 series can be found, under the general title Optical Fibres,
on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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SIST EN 60793-1-54:2013
60793-1-54 © IEC:2012(E) – 5 –
OPTICAL FIBRES –
Part 1-54: Measurement methods and test procedures –
Gamma irradiation
1 Scope
This part of IEC 60793 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
...
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