Fibre optic sensors - Part 2-1: Strain measurement - Strain sensors based on fibre Bragg gratings (IEC 61757-1-1:2016)

This part of IEC 61757 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 61757-1:2012.
This standard 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 standard refers to the measurement of static and dynamic strain values in
a range of frequencies.
A blank detail specification is provided in Annex B.

Lichtwellenleitersensoren - Teil 1-1: Dehnungsmessungen - Dehnungssensoren basierend auf Faser-Bragg-Gatter

Capteurs à fibres optiques – Partie 1-1: Mesure de déformation – Capteurs de déformation basés sur des réseaux de Bragg à fibres

IEC 61757-1-1:2016 définit des spécifications particulières pour des capteurs à fibres optiques utilisant un ou plusieurs réseaux de Bragg à fibres (FBG: fibre bragg grating) comme élément de détection pour les mesures de déformation. Des spécifications génériques pour les capteurs à fibres optiques sont définies dans l'IEC 61757-1:2012. Cette norme spécifie les caractéristiques les plus importantes d'un capteur à fibres optiques servant à mesurer des déformations en utilisant un réseau de Bragg à fibres comme élément de détection, et elle définit les procédures permettant de déterminer ces caractéristiques. Elle spécifie également les paramètres et les caractéristiques des performances de base de l'appareil utilisé pour mesurer le signal optique provenant du FBG. La présente norme 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.
La présente Norme internationale doit être utilisée conjointement avec l'IEC 61757-1:2012.

Optična zaznavala - 2-1. del: Merjenje deformacij - Zaznavala deformacij na podlagi vlakenskih braggovih rešetk (IEC 61757-1-1:2016)

Ta del standarda IEC 61757 določa podrobne specifikacije za optična zaznavala, ki uporabljajo eno ali več vlakenskih Braggovih rešetk (FBG) kot občutljiv element za merjenje deformacij. Splošne specifikacije za optična zaznavala so določene v standardu IEC 61757-1:2012.
Ta standard določa najpomembnejše značilnosti in lastnosti optičnih zaznaval za merjenje deformacij na podlagi uporabe vlakenske Braggove rešetke kot občutljivega elementa ter opredeljuje postopke za določanje deformacij. Določa tudi osnovne parametre delovanja in lastnosti ustreznega merilnega instrumenta za zajemanje optičnega signala vlakenske Braggove rešetke. Ta standard obravnava merjenje statičnih in dinamičnih vrednosti deformacij v različnih frekvencah.
Dodatek B vsebuje okvirno podrobno specifikacijo.

General Information

Status
Withdrawn
Publication Date
27-Mar-2017
Withdrawal Date
07-May-2023
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
08-May-2023
Due Date
31-May-2023
Completion Date
08-May-2023

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fibre optic sensors - Part 2-1: Strain measurement - Strain sensors based on fibre Bragg gratings (IEC 61757-1-1:2016)33.180.99YODNQDOther fibre optic equipmentICS:Ta slovenski standard je istoveten z:EN 61757-1-1:2017SIST EN 61757-1-1:2017en01-maj-2017SIST EN 61757-1-1:2017SLOVENSKI
STANDARD



SIST EN 61757-1-1:2017



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 61757-1-1
February 2017 ICS 33.180.99
English Version
Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings (IEC 61757-1-1:2016)
Capteurs à fibres optiques - Partie 1-1: Mesure de déformation - Capteurs de déformation basés sur des réseaux de Bragg à fibres (IEC 61757-1-1:2016)
LWL¬-Sensoren - Teil 1-1: Zugmessungen - Zugsensoren basierend auf Faser-Bragg-Gatter (IEC 61757-1-1:2016) This European Standard was approved by CENELEC on 2016-03-31. 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, 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: Avenue Marnix 17,
B-1000 Brussels © 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61757-1-1:2017 E SIST EN 61757-1-1:2017



EN 61757-1-1:2017 2 European foreword The text of document 86C/1322/CDV, future edition 1 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 61757-1-1:2017.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2017-08-17 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2020-02-17
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.
This publication is to be read in conjunction with EN 61757-1:2012.
Endorsement notice The text of the International Standard IEC 61757-1-1:2016 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 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.
SIST EN 61757-1-1:2017



EN 61757-1-1:2017 3
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 1 When 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_- Part_102: Mathematics_- General concepts and linear algebra - series
IEC 60068-2 series
Environmental testing -- Part 2: Tests EN 60068-2 series
IEC 60793-2 -
Optical fibres - Part 2: Product specifications - General EN 60793-2 -
IEC 60874-1 -
Fibre optic interconnecting devices and passive components - Connectors for optical fibres and cables -- Part 1: Generic specification EN 60874-1 -
IEC 61300-2 series
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures -- Part 2-1: Tests - Vibration (sinusoidal) - series
IEC 61757-1 2012
Fibre optic sensors -- Part 1: Generic specification EN 61757-1 2012
IEC 62129-1 -
Calibration of wavelength/optical frequency measurement instruments - Part 1: Optical spectrum analyzers EN 62129-1 -
IEC 62129-2 -
Calibration of wavelength/optical frequency measurement instruments -- Part 2: Michelson interferometer single wavelength meters EN 62129-2 -
IEC/TR 61931 -
Fibre optic - Terminology - -
IEC/TS 62129-3 -
Calibration of wavelength/optical frequency measurement instruments - Part 3: Optical frequency meters using optical frequency combs - -
ISO/IEC Guide 99 -
International vocabulary of metrology - Basic and general concepts and associated terms (VIM) - -
SIST EN 61757-1-1:2017



SIST EN 61757-1-1:2017



IEC 61757-1-1 Edition 1.0 2016-02 INTERNATIONAL STANDARD
Fibre optic sensors –
Part 1-1: Strain measurement – Strain sensors based on fibre Bragg gratings
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ICS 33.180.99
ISBN 978-2-8322-3188-3
® Registered trademark of the International Electrotechnical Commission ®
Warning! Make sure that you obtained this publication from an authorized distributor. SIST EN 61757-1-1:2017 colourinside



– 2 – IEC 61757-1-1:2016 © IEC 2016 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 8 2 Normative references. 8 3 Terms and definitions . 9 4 Symbols . 13 5 Structure and characteristics . 14 5.1 Fibre Bragg grating (FBG) . 14 5.2 FBG strain sensor configuration. 18 5.3 Measuring point and installation . 18 5.4 Gauge length . 19 5.5 Strain and reference strain . 19 5.6 Reference wavelength . 19 5.7 Stability behaviour . 20 5.7.1 Drift and creep . 20 5.7.2 Shape stability of the Bragg grating peak . 20 5.7.3 Hysteresis . 20 5.8 Test specimen . 20 5.9 Indication of the measured values . 21 5.10 Zero point related measurement . 21 5.11 Non-zero point related measurement . 21 5.12 Production set . 21 5.13 FBG strain sensor standard type . 21 5.14 FBG strain sensor series . 21 6 Features and characteristics to be reported . 21 6.1 Construction details and geometrical dimensions . 21 6.2 Configuration of the FBG strain sensor . 22 6.3 Temperature and humidity range . 22 6.4 Connecting requirement . 22 7 Features and characteristics to be measured . 22 7.1 Sampling and statistical evaluation . 22 7.1.1 Sampling . 22 7.1.2 Random sampling . 22 7.1.3 Type testing . 22 7.1.4 Series testing . 22 7.1.5 Individual sample testing . 23 7.1.6 Reporting the measuring result . 23 7.1.7 Sample conditioning . 23 7.1.8 Ambient test conditions . 23 7.1.9 Required type of test for individual characteristics . 23 7.2 Bragg wavelength B . 24 7.2.1 General . 24 7.2.2 Measuring procedure . 24 7.2.3 Evaluation . 25 7.2.4 Reporting . 25 SIST EN 61757-1-1:2017



IEC 61757-1-1:2016 © IEC 2016 – 3 – 7.3 FBG spectral width . 25 7.3.1 Measuring procedure . 25 7.3.2 Evaluation . 25 7.3.3 Reporting . 25 7.4 FBG reflectivity . 25 7.4.1 Measuring procedure . 25 7.4.2 Evaluation . 26 7.4.3 Reporting . 26 7.5 FBG Strain sensitivity . 26 7.5.1 General . 26 7.5.2 Tensile test set-up . 27 7.5.3 Measuring procedure tensile test . 27 7.5.4 Evaluation . 28 7.5.5 Reporting . 28 7.6 Gauge factor k . 28 7.6.1 General . 28 7.6.2 Bending test set-up . 29 7.6.3 Measurement procedure . 31 7.6.4 Evaluation . 32 7.6.5 Reporting . 32 7.7 Maximum strain range at room temperature . 32 7.7.1 General . 32 7.7.2 Test set-up . 32 7.7.3 Measuring procedure . 33 7.7.4 Evaluation . 33 7.7.5 Reporting . 33 7.8 Fatigue behaviour . 34 7.8.1 Test set-up . 34 7.8.2 Measuring procedure . 34 7.8.3 Evaluation . 34 7.8.4 Reporting . 35 7.9 Minimum operating radius of curvature . 35 7.9.1 Measuring procedure . 35 7.9.2 Evaluation . 35 7.9.3 Reporting . 35 7.10 Temperature and humidity ranges . 35 7.10.1 General . 35 7.10.2 Measuring procedure . 36 7.10.3 Evaluation . 36 7.10.4 Reporting . 36 7.11 Other environmental influences . 36 7.12 Temperature-induced strain response . 36 7.12.1 General . 36 7.12.2 Test set-up . 37 7.12.3 Measuring procedure . 38 7.12.4 Evaluation . 38 7.12.5 Reporting . 38 7.13 Proof test and lifetime considerations . 38 7.13.1 General . 38 SIST EN 61757-1-1:2017



– 4 – IEC 61757-1-1:2016 © IEC 2016 7.13.2 Measuring procedure . 39 7.13.3 Evaluation . 39 7.13.4 Reporting . 40 8 Recommendations for use of FBG measuring instruments . 40 Annex A (informative)
Further properties of FBG strain sensors . 41 A.1 General . 41 A.2 Extended explanation of FBG side-lobes for different conditions of use . 41 Annex B (informative)
Blank detail specification . 45 B.1 General . 45 B.2 Mechanical setup of the FBG strain sensor . 45 B.3 Operational characteristics of the FBG strain sensor . 45 B.4 Limiting parameters of the FBG strain sensor . 46 B.5 Temperature data of the FBG strain sensor . 46 B.6 Further information of the FBG strain sensor given upon request . 46 B.7 Key performance data of the FBG measuring instrument . 46 Annex C (informative)
Polarization effects . 48 Annex D (informative)
Applied FBG strain sensors . 49 D.1 General . 49 D.2 Recommended bonding process . 49 Bibliography . 50
Figure 1 – Characteristics of the Bragg grating reflectance spectrum . 10 Figure 2 – Operation principle of a fibre Bragg grating in an optical waveguide . 15 Figure 3 – Reflection spectrum of a fibre Bragg grating array . 17 Figure 4 – Gauge length between two attachment points . 18 Figure 5 – Reflection spectrum of a FBG [calculated (left)
and measured spectrum (right)] . 24 Figure 6 – Determination of RFBG from the FBG reflection spectrum (left, Equation (9))
and transmission spectrum (right, Equation (10)) . 26 Figure 7 – Example set-up of a tensile test facility . 27 Figure 8 – Test layout (left) for the 4-point bending test with scheme of
lateral force and bending moment curves (right) . 29 Figure 9 – Determination of the strain via displacement measurement . 30 Figure 10 – Whole-surface applied sensor on a bended flexural beam . 31 Figure 11 – Test specimen with applied FBG strain sensor . 34 Figure A.1 – Side-lobes in the case of a single FBG strain sensor . 42 Figure A.2 – Fundamental peaks and detected side-lobe peaks
in the case of serially multiplexed FBGs . 42 Figure A.3 – Spectral peaks in the case of serially multiplexed FBGs . 43 Figure A.4 – Parameters to identify fundamental peaks and side-lobes . 43 Figure A.5 – Identification of fundamental peaks and side-lobes . 44
Table 1 – Required type of test for individual characteristics . 23
SIST EN 61757-1-1:2017



IEC 61757-1-1:2016 © IEC 2016 – 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 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 61757-1-1 has been prepared by subcommittee SC 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics. The text of this standard is based on the following documents: CDV Report on voting 86C/1322/CDV 86C/1353/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 in the IEC 61757 series, published under the general title Fibre optic sensors, can be found on the IEC website.
SIST EN 61757-1-1:2017



– 6 – IEC 61757-1-1:2016 © IEC 2016 This International Standard is to be used in conjunction with IEC 61757-1:2012.
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.
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.
SIST EN 61757-1-1:2017



IEC 61757-1-1:2016 © IEC 2016 – 7 – INTRODUCTION It has been decided to restructure the IEC 61757 series, with the following logic. From now on, the sub-parts will be renumbered as IEC 61757-M-T, where M denotes the measure and T, the technology.
The existing part IEC 61757-1:2012 will be renumbered as IEC 61757 when it will be revised as edition 2.0 and will serve as an umbrella document over the entire series.
SIST EN 61757-1-1:2017



– 8 – IEC 61757-1-1:2016 © IEC 2016 FIBRE OPTIC SENSORS –
Part 1-1: Strain measurement –
Strain sensors based on fibre Bragg gratings
1 Scope This part of IEC 61757 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 61757-1:2012. This standard 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 standard refers to the measurement of static and dynamic strain values in a range of frequencies. A blank detail specification is provided in Annex B. 2 Normative references 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. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at http://www.electropedia.org) IEC 60068-2 (all parts), Environmental testing – Part 2: Tests IEC 60793-2, Optical fibres – Part 2: Product specifications – General IEC 60874-1, Fibre optic interconnecting devices and passive components – Connectors for optical fibres and cables – Part 1: Generic specification IEC 61300-2 (all parts), Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2: Tests IEC 61757-1:2012, Fibre optic sensors – Part 1: Generic specification IEC 62129-1, Calibration of wavelength/optical frequency measurement instruments – Part 1: Optical spectrum analyzers IEC 62129-2, Calibration of wavelength/optical frequency measurement instruments – Part 2: Michelson interferometer single wavelength meters IEC TS 62129-3, Calibration of wavelength/optical frequency measurement instruments – Part 3: Optical frequency meters using optical frequency combs IEC TR 61931, Fibre optic – Terminology SIST EN 61757-1-1:2017



IEC 61757-1-1:2016 © IEC 2016 – 9 – ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts
...

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