IEC 61757-1-1:2020
(Main)Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings
Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings
IEC 61757-1-1:2020 defines detail specifications for fibre optic sensors using one or more fibre Bragg gratings (FBG) as the sensitive element for strain measurements. Generic specifications for fibre optic sensors are defined in IEC 61757. This document specifies the most important features and characteristics of a fibre optic sensor for strain measurements, based on use of an FBG as the sensitive element, and defines the procedures for their determination. Furthermore, it specifies basic performance parameters and characteristics of the corresponding measuring instrument to read out the optical signal from the FBG. This document refers to the measurement of static and dynamic strain values in a range of frequencies. A blank detail specification is provided in Annex B. 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:
- update of cited standards;
- clarification of definitions and test specifications.
Capteurs fibroniques - Partie 1-1: Mesure de déformation - Capteurs de déformation basés sur des réseaux de Bragg à fibres
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.
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IEC 61757-1-1 ®
Edition 2.0 2020-03
REDLINE VERSION
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STANDARD
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Fibre optic sensors –
Part 1-1: Strain measurement – Strain sensors based on fibre Bragg gratings
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International Standards for all electrical, electronic and related technologies.
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IEC 61757-1-1 ®
Edition 2.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic sensors –
Part 1-1: Strain measurement – Strain sensors based on fibre Bragg gratings
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.99 ISBN 978-2-8322-8092-8
– 2 – IEC 61757-1-1:2020 RLV © 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. 14
5.1 Fibre Bragg grating (FBG) . 16
5.2 FBG strain sensor configuration . 19
5.3 Measuring point and installation . 20
5.4 Gauge length . 20
5.5 Strain and reference strain . 20
5.6 Reference wavelength . 21
5.7 Stability behaviour . 21
5.7.1 Drift and creep . 21
5.7.2 Shape stability of the Bragg grating peak . 22
5.7.3 Hysteresis . 22
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 . 23
5.12 Production set . 23
5.13 FBG strain sensor standard type . 23
5.14 FBG strain sensor series . 23
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 . 24
7.1 Sampling and statistical evaluation . 24
7.1.1 Sampling . 24
7.1.2 Random sampling . 24
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 . 25
7.1.8 Ambient test conditions . 25
7.1.9 Required type of test for individual characteristics . 25
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
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 . 28
7.5 FBG strain sensitivity . 28
7.5.1 General . 28
7.5.2 Tensile test set-up . 29
7.5.3 Measuring procedure tensile test . 29
7.5.4 Evaluation . 30
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 . 33
7.6.4 Evaluation . 34
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 . 35
7.7.3 Measuring procedure . 35
7.7.4 Evaluation . 35
7.7.5 Reporting . 36
7.8 Fatigue behaviour . 36
7.8.1 Test set-up . 36
7.8.2 Measuring procedure . 36
7.8.3 Evaluation . 37
7.8.4 Reporting . 37
7.9 Minimum operating radius of curvature . 37
7.9.1 Measuring procedure . 37
7.9.2 Evaluation . 37
7.9.3 Reporting . 37
7.10 Temperature and humidity ranges . 37
7.10.1 General . 37
7.10.2 Measuring procedure . 38
7.10.3 Evaluation . 38
7.10.4 Reporting . 38
7.11 Other environmental influences . 38
7.12 Temperature-induced strain response . 39
7.12.1 General . 39
7.12.2 Test set-up . 39
7.12.3 Measuring procedure . 40
7.12.4 Evaluation . 40
7.12.5 Reporting . 40
7.13 Proof test and lifetime considerations . 40
7.13.1 General . 40
...
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
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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and once 67 000 electrotechnical terminology entries in English and
a month by email. French extracted from the Terms and Definitions clause of IEC
publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or need CISPR.
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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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
– 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
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
...
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