EN IEC 61757-3-2:2022

Fibre optic sensors - Part 3-2: Acoustic sensing and vibration measurement - Distributed sensing

This part of IEC 61757 specifies terminology, characteristic performance parameters, related test and calculation methods, and specific test equipment for interrogation units used in distributed fibre optic acoustic sensing and vibration measurement systems. This document refers to Rayleigh backscatter and phase detection method by phase-sensitive coherent optical time-domain reflectometry (ϕ-OTDR) only. Quasi-static and low frequency operation modes are not covered by this document. Generic specifications for fibre optic sensors are defined in IEC 61757.

Lichtwellenleitersensoren - Teil 3-2: Akustische Sensorik und Schwingungsmessung - Verteilte Sensorik

Capteurs fibroniques – Partie 3-2: Détection acoustique et mesure des vibrations - Détections réparties

IEC 61757-3-2:2022 spécifie la terminologie, les paramètres de performance caractéristiques, les méthodes d’essai et de calcul associées, ainsi que le matériel d’essai spécifique pour les unités d’interrogation utilisées dans les systèmes fibroniques répartis de mesure de vibrations et de détection acoustique. Le présent document se réfère uniquement à la méthode de rétrodiffusion de Rayleigh et de détection de phase par réflectométrie optique cohérente dans le domaine temporel sensible à la phase (ϕ-OTDR). Les modes de fonctionnement quasi statiques et à basses fréquences ne sont pas traités dans le présent document. Les spécifications génériques applicables aux capteurs fibroniques sont définies dans l’IEC 61757.

Optični senzorji - 3-2. del: Akustično zaznavanje in merjenje vibracij - Razpršeno zaznavanje (IEC 61757-3-2:2022)

Ta del standarda IEC 61757 določa terminologijo, značilne parametre delovanja, povezane preskusne in računske metode ter posebno preskusno opremo za zasliševalne enote, ki se uporabljajo pri sistemih z optičnimi vlakni za razpršeno akustično zaznavanje in merjenje vibracij. Ta dokument se navezuje samo na metodo zaznavanja povratnega sipanja in faz po Rayleighu s fazno občutljivo koherentno optično reflektometrijo v časovnem prostoru (ϕ-OTDR). Ta dokument ne obravnava navidezno statičnih in nizkofrekvenčnih načinov delovanja. Splošne specifikacije za optična zaznavala so določene v standardu IEC 61757.

General Information

• Status: Published
• Publication Date: 05-May-2022
• ICS: 33.180.99 - Other fibre optic equipment
• Technical Committee: CLC/SR 86C - Fibre optic systems and active devices
• Drafting Committee: IEC/SC 86C - IEC_SC_86C
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 06-May-2022
• Completion Date: 06-May-2022
• Ref Project: SIST EN IEC 61757-3-2:2022 - Fibre optic sensors - Part 3-2: Acoustic sensing and vibration measurement - Distributed sensing (IEC 61757-3-2:2022)

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2022
Optični senzorji - 3-2. del: Akustično zaznavanje in merjenje vibracij - Razpršeno
zaznavanje (IEC 61757-3-2:2022)
Fibre optic sensors - Part 3-2: Acoustic sensing and vibration measurement - Distributed
sensing (IEC 61757-3-2:2022)
Lichtwellenleitersensoren - Teil 3-2: Akustische Sensorik und Schwingungsmessung -
Verteilte Sensorik (IEC 61757-3-2:2022)
Capteurs fibroniques – Partie 3-2: Détection acoustique et mesure des vibrations -
Détections réparties (IEC 61757-3-2:2022)
Ta slovenski standard je istoveten z: EN IEC 61757-3-2:2022
ICS:
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement in general
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 61757-3-2

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2022
ICS 33.180.99
English Version
Fibre optic sensors - Part 3-2: Acoustic sensing and vibration
measurement - Distributed sensing
(IEC 61757-3-2:2022)
Capteurs fibroniques - Partie 3-2: Détection acoustique et Lichtwellenleitersensoren - Teil 3-2: Akustische Sensorik
mesure des vibrations - Détections réparties und Schwingungsmessung - Verteilte Sensorik
(IEC 61757-3-2:2022) (IEC 61757-3-2:2022)
This European Standard was approved by CENELEC on 2022-05-03. 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61757-3-2:2022 E

European foreword
The text of document 86C/1700/CDV, future edition 1 of IEC 61757-3-2, 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 61757-3-2:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-02-03
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-05-03
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 61757-3-2:2022 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60869-1 NOTE Harmonized as EN IEC 60869-1
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 61757 2018 Fibre optic sensors - Generic specification EN IEC 61757 2018
IEC 61757-2-2 2016 Fibre optic sensors - Part 2-2: Temperature EN 61757-2-2 2017
measurement - Distributed sensing

IEC 61757-3-2 ®
Edition 1.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic sensors –
Part 3-2: Acoustic sensing and vibration measurement – Distributed sensing

Capteurs fibroniques –
Partie 3-2: Détection acoustique et mesure des vibrations – Détections réparties

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.99 ISBN 978-2-8322-1093-1

– 2 – IEC 61757-3-2:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, abbreviated terms and symbols . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 11
3.3 Symbols . 12
4 Performance parameters of a distributed acoustic sensing system . 13
5 Test apparatuses for performance parameter determination . 13
5.1 Simulated fibre sensor (SFS) . 13
5.2 Fibre stretcher . 14
5.3 Signal generation and amplification instrumentation . 15
5.4 Optical attenuator . 15
5.5 Isolation chamber . 15
6 Test procedures of performance parameters . 16
6.1 General . 16
6.2 Dynamic range . 16
6.2.1 General . 16
6.2.2 Set-up . 16
6.2.3 Stimulus . 16
6.2.4 Data collection and processing . 17
6.2.5 Data reporting. 19
6.3 Frequency response . 19
6.3.1 General . 19
6.3.2 Set-up . 19
6.3.3 Stimulus . 20
6.3.4 Data collection and processing . 20
6.3.5 Data reporting. 21
6.4 Fidelity . 23
6.4.1 General . 23
6.4.2 Set-up . 23
6.4.3 Stimulus . 23
6.4.4 Data collection and processing . 24
6.4.5 Data reporting. 24
6.5 Self-noise . 24
6.5.1 General . 24
6.5.2 Set-up . 24
6.5.3 Stimulus . 25
6.5.4 Data collection and processing . 25
6.5.5 Data reporting. 28
6.6 Spatial resolution . 28
6.6.1 General . 28
6.6.2 Set-up . 29
6.6.3 Stimulus . 29
6.6.4 Data collection and processing . 29

IEC 61757-3-2:2022 © IEC 2022 – 3 –
6.6.5 Data reporting. 30
6.7 Crosstalk . 32
6.7.1 General . 32
6.7.2 Set-up . 32
6.7.3 Stimulus . 32
6.7.4 Data collection and processing . 32
6.7.5 Data reporting. 33
6.8 Loss budget . 33
6.8.1 General . 33
6.8.2 Set-up . 34
6.8.3 Stimulus . 34
6.8.4 Data collection and processing . 34
6.8.5 Data reporting. 34
6.9 Sensor reflection robustness . 35
6.9.1 General . 35
6.9.2 Set-up . 35
6.9.3 Stimulus . 37
6.9.4 Data collection, processing, and reporting . 38
Annex A (informative) Conversion of optical phase measurement to strain . 39
Annex B (normative) Requirements for low uncertainty measurement . 42
B.1 Single tone stimulus testing .
...