IEC 61757-5-1:2021

Fibre optic sensors - Part 5-1: Tilt measurement - Tilt sensors based on fibre Bragg gratings

IEC 61757-5-1:2021 defines the terminology, structure, characteristics and their measurement method including the procedures, for an optical tilt sensor based on fibre Bragg gratings (FBGs) as the sensitive element.

Capteurs fibroniques - Partie 5-1: Mesure d’inclinaison - Capteurs d’inclinaison basés sur des réseaux de Bragg à fibres

IEC 61757-5-1:2021 définit la terminologie, la structure, les caractéristiques et la méthode de mesure, incluant les procédures, d’un capteur d’inclinaison optique basé sur des réseaux de Bragg à fibres (FBG, fibre Bragg gratings) et utilisé comme élément sensible.

General Information

• Status: Published
• Publication Date: 06-Jul-2021
• ICS: 33.180.99 - Other fibre optic equipment
• Technical Committee: SC 86C - Fibre optic systems and active devices
• Drafting Committee: WG 2 - TC 86/SC 86C/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 28-Jul-2021
• Completion Date: 07-Jul-2021

Standards Content (Sample)

IEC 61757-5-1 ®
Edition 1.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic sensors –
Part 5-1: Tilt measurement – Tilt sensors based on fibre Bragg gratings

Capteurs fibroniques –
Partie 5-1: Mesure d’inclinaison – Capteurs d’inclinaison 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.: [phone]
3, rue de Varembé [e-mail]
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 IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 18 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Découvrez notre puissant moteur de recherche et consultez
webstore.iec.ch/advsearchform gratuitement tous les aperçus des publications. Avec un
La recherche avancée permet de trouver des publications IEC abonnement, vous aurez toujours accès à un contenu à jour
en utilisant différents critères (numéro de référence, texte, adapté à vos besoins.
comité d’études, …). Elle donne aussi des informations sur les
projets et les publications remplacées ou retirées. Electropedia - www.electropedia.org

Le premier dictionnaire d'électrotechnologie en ligne au monde,
IEC Just Published - webstore.iec.ch/justpublished
avec plus de 22 000 articles terminologiques en anglais et en
Restez informé sur les nouvelles publications IEC. Just
français, ainsi que les termes équivalents dans 16 langues
Published détaille les nouvelles publications parues.
additionnelles. Egalement appelé Vocabulaire
Disponible en ligne et une fois par mois par email.
Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC online collection - oc.iec.ch

IEC 61757-5-1 ®
Edition 1.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic sensors –
Part 5-1: Tilt measurement – Tilt sensors based on fibre Bragg gratings

Capteurs fibroniques –
Partie 5-1: Mesure d’inclinaison – Capteurs d’inclinaison basés sur des réseaux

de Bragg à fibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.99 ISBN 978-2-8322-9949-4

– 2 – IEC 61757-5-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols . 8
5 Structure and characteristics . 9
5.1 Fibre Bragg grating (FBG) . 9
5.2 FBG tilt sensor configuration . 9
5.3 Reference wavelength . 11
5.4 Stability behaviour . 11
5.4.1 Drift and creep . 11
5.4.2 Hysteresis . 12
5.5 Test specimen . 12
5.6 Indication of the measured values . 12
5.7 Zero point related measurement . 12
5.8 Non-zero point related measurement . 12
5.9 Production set . 12
5.10 FBG tilt sensor standard type . 13
5.11 FBG tilt sensor series . 13
6 Features and characteristics to be measured . 13
6.1 Sampling and statistical evaluation . 13
6.1.1 Sampling . 13
6.1.2 Reporting the measuring result . 13
6.1.3 Sample conditioning . 14
6.1.4 Ambient test conditions . 14
6.1.5 Required type of test for individual characteristics . 14
6.2 Bragg wavelength λ . 14
Β
6.2.1 General . 14
6.2.2 Measuring procedure . 15
6.2.3 Evaluation . 15
6.2.4 Reporting . 15
6.3 FBG spectral width. 15
6.3.1 Measuring procedure . 15
6.3.2 Evaluation . 15
6.3.3 Reporting . 15
6.4 FBG reflectivity . 16
6.4.1 Measuring procedure . 16
6.4.2 Evaluation . 16
6.4.3 Reporting . 16
6.5 Tilt measurement . 16
6.5.1 Test set-up . 16
6.5.2 Measuring procedure . 17
6.5.3 Calibration and evaluation . 18
6.6 Gauge factor κ . 19
θ
6.7 Temperature and humidity ranges . 19

6.7.1 General . 19
6.7.2 Measuring procedure . 19
6.7.3 Evaluation . 20
6.7.4 Reporting . 20
7 Features and characteristics to be reported . 20
7.1 Construction details . 20
7.2 Configuration of the FBG tilt sensor . 20
7.3 Temperature and humidity range . 20
7.4 Connecting requirement . 20
8 Recommendations for use of FBG measuring instruments . 20

Figure 1 – Examples for measuring single axis tilt changes . 10
Figure 2 – Examples of Bragg wavelength change caused by tilt . 10
Figure 3 – Example of tilt sensor using FBG (schematic diagram) . 11
Figure 4 – Schematic diagram of tilt measurement system . 16
Figure 5 – Example of temperature dependence of the Bragg wavelengths of two
FBGs . 17
Figure 6 – Example of tilt dependence of the Bragg wavelengths of FBG1 and FBG2 . 18

Table 1 – Required type of test for individual characteristics . 14

– 4 – IEC 61757-5-1:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC SENSORS –
Part 5-1: Tilt measurement –
Tilt 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 p
...