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
Current Stage
PPUB - Publication issued
Start Date
28-Jul-2021
Completion Date
07-Jul-2021
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IEC 61757-5-1:2021 - Fibre optic sensors - Part 5-1: Tilt measurement - Tilt sensors based on fibre Bragg gratings
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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
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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,
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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-
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...

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