SIST EN IEC 61757-1-1:2020
(Main)Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings (IEC 61757-1-1:2020)
Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings (IEC 61757-1-1:2020)
IEC 61757-1-1 defines detail specifications for fibre optic sensors using one or morefibre Bragg gratings (FBG) as the sensitive element for strain measurements. Genericspecifications for fibre optic sensors are defined in IEC 61757.This document specifies the most important features and characteristics of a fibre optic sensorfor strain measurements, based on use of an FBG as the sensitive element, and defines theprocedures for their determination. Furthermore, it specifies basic performance parameters andcharacteristics of the corresponding measuring instrument to read out the optical signal fromthe FBG. This document refers to the measurement of static and dynamic strain values in arange of frequencies.A blank detail specification is provided in Annex B.
Lichtwellenleitersensoren - Teil 1-1: Dehnungsmessungen - Dehnungssensoren basierend auf Faser-Bragg-Gitter (IEC 61757-1-1:2020)
Capteurs à fibres optiques - Partie 1-1: Mesure de déformation - Capteurs de déformation basés sur des réseaux de Bragg à fibres (IEC 61757-1-1:2020)
IEC 61757-1-1:2020 est disponible sous forme de IEC 61757-1-1:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61757-1-1:2020 définit des spécifications particulières pour des capteurs fibroniques utilisant un ou plusieurs réseaux de Bragg à fibres (FBG, fibre Bragg gratings) comme élément de détection pour les mesures de déformation. Des spécifications génériques pour les capteurs fibroniques sont définies dans l'IEC 61757. Le présent document spécifie les caractéristiques les plus importantes d'un capteur fibronique servant à mesurer des déformations en utilisant un FBG comme élément de détection, et il définit les procédures permettant de déterminer ces caractéristiques. Il spécifie également les paramètres et les caractéristiques des performances de base de l'appareil utilisé pour mesurer le signal optique provenant du FBG. Le présent document porte sur la mesure des valeurs de déformations statiques et dynamiques sur une plage de fréquences. Une spécification particulière-cadre est fournie à l'Annexe B. Cette deuxième édition annule et remplace la première édition parue en 2016 dont elle constitue une révision technique. La présente édition inclut les modifications techniques suivantes par rapport à l'édition précédente:
- mise à jour des normes citées;
- clarification des définitions et des spécifications d'essais.
Optični senzorji - 1-1. del: Merjenje deformacij - Zaznavala deformacij na podlagi vlakenske Braggove uklonske mrežice (IEC 61757-1-1:2020)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 61757-1-1:2020
01-julij-2020
Nadomešča:
SIST EN 61757-1-1:2017
Optični senzorji - 1-1. del: Merjenje deformacij - Zaznavala deformacij na podlagi
vlakenske Braggove uklonske mrežice (IEC 61757-1-1:2020)
Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg
gratings (IEC 61757-1-1:2020)
Lichtwellenleitersensoren - Teil 1-1: Dehnungsmessungen - Dehnungssensoren
basierend auf Faser-Bragg-Gitter (IEC 61757-1-1:2020)
Capteurs à fibres optiques - Partie 1-1: Mesure de déformation - Capteurs de
déformation basés sur des réseaux de Bragg à fibres (IEC 61757-1-1:2020)
Ta slovenski standard je istoveten z: EN IEC 61757-1-1:2020
ICS:
33.180.99 Druga oprema za optična Other fibre optic equipment
vlakna
SIST EN IEC 61757-1-1:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 61757-1-1:2020
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SIST EN IEC 61757-1-1:2020
EUROPEAN STANDARD EN IEC 61757-1-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 33.180.99 Supersedes EN 61757-1-1:2017 and all of its
amendments and corrigenda (if any)
English Version
Fibre optic sensors - Part 1-1: Strain measurement - Strain
sensors based on fibre Bragg gratings
(IEC 61757-1-1:2020)
Capteurs fibroniques - Partie 1-1: Mesure de déformation - Lichtwellenleitersensoren - Teil 1-1: Dehnungsmessungen -
Capteurs de déformation basés sur des réseaux de Bragg à Dehnungssensoren basierend auf Faser-Bragg-Gitter
fibres (IEC 61757-1-1:2020)
(IEC 61757-1-1:2020)
This European Standard was approved by CENELEC on 2020-05-01. 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 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61757-1-1:2020 E
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SIST EN IEC 61757-1-1:2020
EN IEC 61757-1-1:2020 (E)
European foreword
The text of document 86C/1642/FDIS, future edition 2 of IEC 61757-1-1, prepared by SC 86C "Fibre
optic systems and active devices" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 61757-1-1:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-02-01
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-05-01
document have to be withdrawn
This document supersedes EN 61757-1-1:2017 and all of its amendments and corrigenda (if any).
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 61757-1-1:2020 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 60793-1-30 NOTE Harmonized as EN 60793-1-30
IEC 60793-1-31 NOTE Harmonized as EN IEC 60793-1-31
IEC 60793-1-33 NOTE Harmonized as EN 60793-1-33
ISO 527-4 NOTE Harmonized as EN ISO 527-4
ISO 7500-1 NOTE Harmonized as EN ISO 7500-1
ISO 14125 NOTE Harmonized as EN ISO 14125
2
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SIST EN IEC 61757-1-1:2020
EN IEC 61757-1-1:2020 (E)
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 60050 series International Electrotechnical - -
Vocabulary
IEC 60068-2 series Environmental testing - Part 2: Tests EN 60068-2 series
IEC 60793-2 - Optical fibres - Part 2: Product EN IEC 60793-2 -
specifications - General
IEC 60793-2-50 - Optical fibres - Part 2-50: Product EN IEC 60793-2-50 -
specifications - Sectional specification
for class B single-mode fibres
IEC 61300-2 series Fibre optic interconnecting devices and EN 61300-2 series
passive components - Basic test and
measurement procedures - Part 2: Tests
IEC 61754 series Fibre optic interconnecting devices and EN 61754 series
passive components - Fibre optic
connector interfaces
IEC 61757 - Fibre optic sensors - Generic EN IEC 61757 -
specification
IEC/TR 61931 - Fibre optic - Terminology - -
IEC 62129-1 - Calibration of wavelength/optical EN 62129-1 -
frequency measurement instruments -
Part 1: Optical spectrum analyzers
IEC 62129-2 - Calibration of wavelength/optical EN 62129-2 -
frequency measurement instruments -
Part 2: Michelson interferometer single
wavelength meters
IEC 62129-3 - Calibration of wavelength/optical EN IEC 62129-3 -
frequency measurement instruments -
Part 3:Optical frequency meters
internally referenced to a frequency
comb
3
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SIST EN IEC 61757-1-1:2020
EN IEC 61757-1-1:2020 (E)
Publication Year Title EN/HD Year
ISO/IEC Guide 99 - International vocabulary of metrology - - -
Basic and general concepts and
associated terms (VIM)
4
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SIST EN IEC 61757-1-1:2020
IEC 61757-1-1
®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic sensors –
Part 1-1: Strain measurement – Strain sensors based on fibre Bragg gratings
Capteurs fibroniques –
Partie 1-1: Mesure de déformation – Capteurs de déformation basés
sur des réseaux de Bragg à fibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.99 ISBN 978-2-8322-8019-5
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.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 61757-1-1:2020
– 2 – IEC 61757-1-1:2020 © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Symbols . 14
5 Structures and characteristics. 16
5.1 Fibre Bragg grating (FBG) . 16
5.2 FBG strain sensor configuration . 19
5.3 Measuring point and installation . 19
5.4 Gauge length . 20
5.5 Strain and reference strain . 20
5.6 Reference wavelength . 20
5.7 Stability behaviour . 21
5.7.1 Drift and creep . 21
5.7.2 Shape stability of the Bragg grating peak . 21
5.7.3 Hysteresis . 21
5.8 Test specimen . 22
5.9 Indication of the measured values . 22
5.10 Zero point related measurement . 22
5.11 Non-zero point related measurement . 22
5.12 Production set . 22
5.13 FBG strain sensor standard type . 22
5.14 FBG strain sensor series . 22
6 Features and characteristics to be reported . 23
6.1 Construction details and geometrical dimensions . 23
6.2 Configuration of the FBG strain sensor . 23
6.3 Temperature and humidity range . 23
6.4 Connecting requirement . 23
7 Features and characteristics to be measured . 23
7.1 Sampling and statistical evaluation . 23
7.1.1 Sampling . 23
7.1.2 Random sampling . 23
7.1.3 Type testing . 24
7.1.4 Series testing . 24
7.1.5 Individual sample testing . 24
7.1.6 Reporting the measuring result . 24
7.1.7 Sample conditioning . 24
7.1.8 Ambient test conditions . 24
7.1.9 Required type of test for individual characteristics . 24
7.2 Bragg wavelength λ . 25
B
7.2.1 General . 25
7.2.2 Measuring procedure . 26
7.2.3 Evaluation . 26
7.2.4 Reporting . 26
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IEC 61757-1-1:2020 © IEC 2020 – 3 –
7.3 FBG spectral width. 26
7.3.1 Measuring procedure . 26
7.3.2 Evaluation . 27
7.3.3 Reporting . 27
7.4 FBG reflectivity . 27
7.4.1 Measuring procedure . 27
7.4.2 Evaluation . 27
7.4.3 Reporting . 27
7.5 FBG strain sensitivity . 28
7.5.1 General . 28
7.5.2 Tensile test set-up . 28
7.5.3 Measuring procedure tensile test . 29
7.5.4 Evaluation . 29
7.5.5 Reporting . 30
7.6 Gauge factor k . 30
7.6.1 General . 30
7.6.2 Bending test set-up . 30
7.6.3 Measurement procedure . 32
7.6.4 Evaluation . 33
7.6.5 Reporting . 34
7.7 Maximum strain range at room temperature . 34
7.7.1 General . 34
7.7.2 Test set-up . 34
7.7.3 Measuring procedure . 34
7.7.4 Evaluation . 34
7.7.5 Reporting . 35
7.8 Fatigue behaviour . 35
7.8.1 Test set-up . 35
7.8.2 Measuring procedure . 35
7.8.3 Evaluation . 36
7.8.4 Reporting . 36
7.9 Minimum operating radius of curvature . 36
7.9.1 Measuring procedure . 36
7.9.2 Evaluation . 36
7.9.3 Reporting . 36
7.10 Temperature and humidity ranges . 37
7.10.1 General . 37
7.10.2 Measuring procedure . 37
7.10.3 Evaluation . 37
7.10.4 Reporting . 38
7.11 Other environmental influences . 38
7.12 Temperature-induced strain response . 38
7.12.1 General . 38
7.12.2 Test set-up . 39
7.12.3 Measuring procedure . 39
7.12.4 Evaluation . 39
7.12.5 Reporting . 39
7.13 Proof test and lifetime considerations . 40
7.13.1 General . 40
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7.13.2 Measuring procedure . 40
7.13.3 Evaluation . 41
7.13.4 Reporting . 41
8 Recommendations for use of FBG measuring instruments . 41
Annex A (normative) Further properties of FBG strain sensors . 43
A.1 General . 43
A.2 Extended explanation of FBG side-lobes for different conditions of use. 43
Annex B (informative) Blank detail specification . 48
B.1 General . 48
B.2 Mechanical setup of the FBG strain sensor . 48
B.3 Operational characteristics of the FBG strain sensor . 48
B.4 Limiting parameters of the FBG strain sensor. 49
B.5 Temperature data of the FBG strain sensor . 49
B.6 Further information of the FBG strain sensor given upon request . 49
B.7 Key performance data of the FBG measuring instrument . 49
Annex C (informative) Polarization effects . 51
Annex D (informative) Applied FBG strain sensors . 52
D.1 General . 52
D.2 Recommended bonding process . 52
Bibliography . 53
Figure 1 – Characteristics of the Bragg grating reflectance spectrum . 11
Figure 2 – Operation principle of a fibre Bragg grating in an optical waveguide . 17
Figure 3 – Example of a reflection spectrum of a fibre Bragg grating array . 18
Figure 4 – Gauge length between two attachment points . 19
Figure 5 – Reflection spectrum of a FBG (calculated (left) and measured spectrum
(right)) . 25
Figure 6 – Determination of R from the FBG reflection spectrum (left, Equation (9))
FBG
and transmission spectrum (right, Equation (10)) . 27
Figure 7 – Example set-up of a tensile test facility . 29
Figure 8 – Test layout for the 4-point bending test with scheme of lateral force and
bending moment curves . 31
Figure 9 – Determination of the strain via displacement measurement . 31
Figure 10 – Whole-surface applied sensor on a bended flexural beam . 32
Figure 11 – Test specimen with applied FBG strain sensor . 36
Figure A.1 – Side-lobes in the case of a single FBG strain sensor . 44
Figure A.2 – Fundamental peaks and detected side-lobe peaks in the case of serially
multiplexed FBGs . 45
Figure A.3 – Spectral peaks in the case of serially multiplexed FBGs . 45
Figure A.4 – Parameters to identify fundamental peaks and side-lobes . 46
Figure A.5 – Identification of fundamental peaks and side-lobes . 47
Table 1 – Required type of test for individual characteristics . 25
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SIST EN IEC 61757-1-1:2020
IEC 61757-1-1:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC SENSORS –
Part 1-1: Strain measurement –
Strain sensors based on fibre Bragg gratings
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
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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 61757-1-1 has been prepared by subcommittee SC 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following technical changes with respect to the previous edition:
a) update of cited standards;
b) clarification of definitions and test specifications.
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SIST EN IEC 61757-1-1:2020
– 6 – IEC 61757-1-1:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
86C/1642/FDIS 86C/1650/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 61757 series, published under the general title Fibre optic sensors,
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 the correct understanding
of its contents. Users should therefore print this document using a colour printer.
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SIST EN IEC 61757-1-1:2020
IEC 61757-1-1:2020 © IEC 2020 – 7 –
INTRODUCTION
The IEC 61757 series is published with the follow
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