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SLOVENSKI STANDARD
01-november-2021
Optični senzorji - 2-1. del: Merjenje temperature - Temperaturni senzorji na podlagi
optovlakenskih Braggovih rešetk (IEC 61757-2-1:2021)
Fibre Optic Sensors - Part 2-1: Temperature measurement - Temperature sensors based
on fibre Bragg gratings (IEC 61757-2-1:2021)
Lichtwellenleitersensoren - Teil 2-1: Temperaturmessung - Temperatursensoren auf der
Basis von Faser-Bragg-Gittern (IEC 61757-2-1:2021)
Capteurs fibroniques - Partie 2-1: Mesure de la température - Capteurs de température
basés sur des réseaux de Bragg à fibres (IEC 61757-2-1:2021)
Ta slovenski standard je istoveten z: EN IEC 61757-2-1:2021
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
33.180.99 Druga oprema za optična Other fibre optic equipment
vlakna
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61757-2-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 33.180.99
English Version
Fibre optic sensors - Part 2-1: Temperature measurement -
Temperature sensors based on fibre Bragg gratings
(IEC 61757-2-1:2021)
Capteurs fibroniques - Partie 2-1: Mesure de la température Lichtwellenleitersensoren - Teil 2-1: Temperaturmessung -
- Capteurs de température basés sur des réseaux de Bragg Temperatursensoren auf der Basis von Faser-Bragg-Gittern
à fibres (IEC 61757-2-1:2021)
(IEC 61757-2-1:2021)
This European Standard was approved by CENELEC on 2021-09-01. 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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61757-2-1:2021 E
European foreword
The text of document 86C/1725/FDIS, future edition 1 of IEC 61757-2-1, 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 61757-2-1:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–06–01
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–09–01
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61757-2-1:2021 was approved by CENELEC as a
European Standard without any modification.
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 - -
(IEV)
IEC 61757 - Fibre optic sensors - Generic specification EN IEC 61757 -
IEC 61757-1-1 2020 Fibre optic sensors - Part 1–1: Strain EN IEC 61757-1-1 2020
measurement - Strain sensors based on
fibre Bragg gratings
ISO/IEC Guide 98-3 - Uncertainty of measurement - Part 3: - -
Guide to the expression of uncertainty in
measurement (GUM:1995)
IEC 61757-2-1
Edition 1.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic sensors –
Part 2-1: Temperature measurement – Temperature sensors based on fibre
Bragg gratings
Capteurs fibroniques –
Partie 2-1: Mesure de la température – Capteurs de température basés
sur des réseaux de Bragg à fibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.99 ISBN 978-2-8322-1009-5
– 2 – IEC 61757-2-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviated terms and symbols of quantities . 7
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 11
3.3 Symbols of quantities . 12
4 Design and characteristics of an FBG temperature sensor . 13
4.1 Fibre Bragg grating (FBG) . 13
4.2 Dependence of Bragg wavelength on temperature . 13
4.3 Design features. 14
5 Performance parameters . 14
6 Test apparatuses for performance parameter determination . 15
6.1 Temperature calibration equipment . 15
6.2 Optical spectrum analyzer and interrogator . 16
6.3 Broadband light source . 16
7 Test procedures of performance parameters . 16
7.1 Sample preparation and test set-up . 16
7.2 Bragg wavelength λ . 17
Bref
7.2.1 Measuring procedure . 17
7.2.2 Evaluation . 18
7.2.3 Reporting . 18
7.3 FBG peak spectral width . 18
7.3.1 Measuring procedure . 18
7.3.2 Evaluation . 18
7.3.3 Reporting . 18
7.4 FBG reflectivity . 18
7.4.1 Measuring procedure . 18
7.4.2 Evaluation . 18
7.4.3 Reporting . 19
7.5 Side-lobe suppression ratio . 19
7.5.1 Measuring procedure . 19
7.5.2 Evaluation . 20
7.5.3 Reporting . 20
7.6 Signal-to-noise ratio . 21
7.6.1 Measuring procedure . 21
7.6.2 Evaluation . 21
7.6.3 Reporting . 21
7.7 Characteristic curve . 22
7.7.1 Measuring procedure . 22
7.7.2 Evaluation . 23
7.7.3 Reporting . 27
7.8 Thermal time constant. 28
7.8.1 Measuring procedure . 28
7.8.2 Evaluation . 28
IEC 61757-2-1:2021 © IEC 2021 – 3 –
7.8.3 Reporting . 28
7.9 Sensor stability . 29
7.9.1 Measuring procedure . 29
7.9.2 Evaluation . 29
7.9.3 Reporting . 29
Annex A (informative) Blank detail specification . 30
A.1 General . 30
A.2 Mechanical and optical set-up . 30
A.3 Operational characteristics . 30
A.4 Limiting parameters . 31
A.5 Further information given upon request . 31
Annex B (informative) Examples of specific temperature calibration equipment . 32
B.1 Simple liquid bath . 32
B.2 Liquid tube-thermostat . 33
B.3 Solid-state calibration equipment . 34
Annex C (informative) Contributions to measurement uncertainty . 37
Bibliography . 38
Figure 1 – Principal test set-up for FBG . 17
Figure 2 – Determination of the FBG reflectivity from the reflection spectrum (left) and
transmission spectrum (right) .
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