IEC 60793-1-54:2018

Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation

IEC 60793-1-54:2018 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. 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:
- test conditions related to photobleaching have been changed;
- 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.

Fibres optiques - Partie 1-54: Méthodes de mesure et procédures d'essai - Irradiation gamma

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

General Information

• Status: Published
• Publication Date: 11-Jan-2018
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86A - Fibres and cables
• Drafting Committee: WG 1 - TC 86/SC 86A/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 26-Jan-2018
• Completion Date: 12-Jan-2018

Relations

• Revises: IEC 60793-1-54:2012 - Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60793-1-54 ®
Edition 3.0 2018-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-54: Measurement methods and test procedures – Gamma irradiation

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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IEC 60793-1-54 ®
Edition 3.0 2018-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-54: Measurement methods and test procedures – Gamma irradiation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-5277-2

– 2 – IEC 60793-1-54:2018 RLV © IEC 2018
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
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 . 8
4.8.1 Class A, Category A1 fibres (graded index multimode fibres) . 8
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
Specimen for environmental background radiation test .
Specimen for testing adverse nuclear environments .
5.2 Test sample length. 9
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 . 10
6.5 Attenuation measurement for adverse nuclear environment . 10
7 Calculations . 11
7.1 Change in optical attenuation Δa (environmental background radiation test) . 11
7.2 Change in optical transmittance, a (adverse nuclear environmental radiation
test) . 11
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 . 12

9 Specification information . 12
Bibliography . 13

– 4 – IEC 60793-1-54:2018 RLV © 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
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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
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This redline version of the official IEC Standard allows the user to identify the changes
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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.
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.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for th
...

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

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

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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

– 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 Δa (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

Bibliography . 13

– 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
...