IEC 61757-1-2:2023

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
...