BRITISH STANDARD
BS EN
62429:2008
Reliability growth —
Stress testing for early
failures in unique
complex systems
ICS 03.120.01; 21.020; 29.020
BS EN 62429:2008
This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 31 July 2008
© BSI 2008
ISBN 978 0 580 56825 1
National foreword
This British Standard is the UK implementation of EN 62429:2008. It is
identical to IEC 62429:200
7.
The UK participation in its preparation was entrusted by Technical Committee
DS/1, Dependability and terotechnology, to Subcommittee DS/1/1,
Dependability.
A list of organizations represented on this committee can be obtained on
request to its secretary.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from
legal obligations.
Amendments/corrigenda issued since publication
Date Comments
EUROPEAN STANDARD
EN 62429
NORME EUROPÉENNE
EUROPÄISCHE NORM
A
pril 2008
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62429:2008 E
ICS 03.120.01; 03.120.99
English version
Reliability growth -
Stress testing for early failures in unique complex systems
(IEC 62429:2007)
Croissance de fiabilité -
Essais de contraintes pour révéler
les défaillances précoces
d'un système complexe et unique
(CEI 62429:2007)
Zuverlässigkeitswachstum -
Beanspruchungsprüfung auf Frühausfälle
in einzelnen komplexen Systemen
(IEC 62429:2007)
This European Standard was approved by CENELEC on 2008-03-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Foreword
The text of document 56/1232/FDIS, future edition 1 of IEC 62429, prepared by IEC TC 56,
Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 62429 on 2008-03-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2008-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2011-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62429:2007 was approved by CENELEC as a European
Standard without any modification.
__________
BS EN 62429:2008
– 2 –
CONTENTS
1
Scope...............................................................................................................................4
2 Justification of measurement ............................................................................................4
3 Apparatus.........................................................................................................................5
3.1 General ...................................................................................................................5
3.2 Light source ............................................................................................................5
3.3 Polarizer and analyzer.............................................................................................5
3.4 Sample fibre preparation .........................................................................................5
3.5 Variable phase compensator ...................................................................................5
3.6 Optical intensity detection .......................................................................................6
3.7 Data acquisition ......................................................................................................6
4 Data analysis and formula ................................................................................................6
4.1 General ...................................................................................................................6
4.2 1-D stress profile for a fibre with a cylindrically symmetric structure ........................7
4.3 2-D stress profile for a fibre with a cylindrically non-symmetric structure .................8
5 Measurement procedure.................................................................................................11
5.1 Alignment of polarizer and analyzer.......................................................................11
5.2 Fibre mounting ......................................................................................................11
5.3 Taking transmitted intensity data
),(
θ
yI
...............................................................11
5.4 Calculation of 1-D stress profile for a fibre with a cylindrically symmetric
structure................................................................................................................11
5.5 Calculation of 2-D stress profile for a fibre with a cylindrically non-symmetric
structure................................................................................................................1
1
6 Documentation ...............................................................................................................11
6.1 Information to be reported for each measurement .................................................11
6.2 Information that should be available upon request.................................................12
Bibliography..........................................................................................................................13
Figure 1 – Polariscopic phase retardation measurement setup for an optical fibre ..................
5
Figure 2 – Measured transmission intensity as a function of fibre radius and external
phase .....................................................................................................................................
6
Figure 3 – Propagation of laser light across the fibre cross-section.........................................7
Figure 4 – Stress profile for a fibre with depressed inner cladding and jacketed tube ..............8
Figure 5 – Examples of projected phase retardation measurement
)( y
δ
for a PM fibre
as a function of fibre radius y when the projected angle
α
is 0°, 45°, 90°, and 135°................9
Figure 6 – Measured projected phases
),(
αδ
y
of a PM fibre for various projected
angles as a function of fibre radius .......................................................................................1
0
Figure 7 – Calculated 2-D stress profile of a PM fibre ...........................................................10
Annex ZA (normative) Normative references to international publications with their
corresponding European publications ...................................................................................15
BS EN 62429:2008
– 3 –
