IEC 61757-1-2:2023

Fibre optic sensors - Part 1-2: Strain measurement - Distributed sensing based on Brillouin scattering

IEC 61757-1-2: 2023 defines detailed specifications for distributed strain measurements with a fibre optic sensor, also known as "fibre optic distributed strain sensing". It is applicable to distributed strain sensing systems (DSS) based on spontaneous or stimulated Brillouin scattering in the optical fibre sensor (strain sensitive element), that is, to sensors capable of measuring absolute strain. This document specifies the most important DSS performance parameters and defines the procedures for their determination.

Capteurs fibroniques - Partie 1-2: Mesure de déformation - Détection répartie basée sur la diffusion de Brillouin

IEC 61757-1-2: 2023 définit des spécifications particulières pour les mesures de déformation réparties avec un capteur fibronique, également appelées "détection de déformation répartie fibronique". Elle s’applique aux systèmes fibroniques répartis de détection de déformation (DSS) basés sur la diffusion de Brillouin spontanée ou stimulée dans le capteur à fibres optiques (élément sensible à la déformation), c’est-à-dire aux capteurs capables de mesurer la déformation absolue. Le présent document spécifie les paramètres de performance DSS les plus importants et définit les procédures pour leur détermination.

General Information

• Status: Published
• Publication Date: 15-Aug-2023
• 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: 15-Sep-2023
• Completion Date: 16-Aug-2023

Standards Content (Sample)

IEC 61757-1-2 ®
Edition 1.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic sensors –
Part 1-2: Strain measurement – Distributed sensing based on Brillouin scattering

Capteurs fibroniques –
Partie 1-2: Mesure de déformation – Détection répartie basée sur la diffusion de
Brillouin
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IEC 61757-1-2 ®
Edition 1.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic sensors –
Part 1-2: Strain measurement – Distributed sensing based on Brillouin scattering

Capteurs fibroniques –
Partie 1-2: Mesure de déformation – Détection répartie basée sur la diffusion de

Brillouin
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.99  ISBN 978-2-8322-7396-8

– 2 – IEC 61757-1-2:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, abbreviated terms and symbols . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 10
3.3 Symbols . 11
4 General test setups for measurement of performance parameters . 11
4.1 General and test setup requirements . 11
4.2 General documentation requirements . 16
5 Measurement procedures for performance parameters . 16
5.1 Strain measurement error . 16
5.1.1 Test procedure and conditions . 16
5.1.2 Parameter calculation and reporting . 17
5.2 Spatial resolution . 17
5.2.1 Test procedure and conditions . 17
5.2.2 Parameter calculation and reporting . 18
5.3 Strain repeatability . 18
5.3.1 Test procedure and conditions . 18
5.3.2 Parameter calculation and reporting . 18
5.4 Spatial strain uncertainty . 19
5.4.1 Test procedure and conditions . 19
5.4.2 Parameter calculation and reporting . 19
5.5 Warm-up time . 20
5.5.1 Test procedure and conditions . 20
5.5.2 Parameter calculation and reporting . 20
5.6 System performance with altered attenuation . 20
5.6.1 General . 20
5.6.2 At distance measurement range . 21
5.6.3 At short distance with high loss. 22
Bibliography . 24

Figure 1 – Optical fibre strain profile and related strain sample points. 8
Figure 2 – General test setup for single-ended configuration . 12
Figure 3 – General test setup for loop configuration . 13
Figure 4 – Measured versus applied strain (typical curve) . 15
Figure 5 – Brillouin frequency shift as a function of elongation of a standard
telecommunication fibre . 15
Figure 6 – Performance evaluation at distance measurement range . 21
Figure 7 – Performance evaluation at short distance with high loss . 22

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC SENSORS –
Part 1-2: Strain measurement –
Distributed sensing based on Brillouin scattering

FOREWORD
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IEC 61757-1-2 has been prepared by subcommittee 86C: Fibre optic systems and active
devices, of IEC technical committee 86: Fibre optics. It is an International Standard.
The text of this International Standard is based
...