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IEC 61757-1-1
Edition 2.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic sensors –
Part 1-1: Strain measurement – Strain sensors based on fibre Bragg gratings
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IEC 61757-1-1
Edition 2.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic sensors –
Part 1-1: Strain measurement – Strain sensors based on fibre Bragg gratings
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.99 ISBN 978-2-8322-8092-8
– 2 – IEC 61757-1-1:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Symbols . 14
5 Structures and characteristics. 14
5.1 Fibre Bragg grating (FBG) . 16
5.2 FBG strain sensor configuration . 19
5.3 Measuring point and installation . 20
5.4 Gauge length . 20
5.5 Strain and reference strain . 20
5.6 Reference wavelength . 21
5.7 Stability behaviour . 21
5.7.1 Drift and creep . 21
5.7.2 Shape stability of the Bragg grating peak . 22
5.7.3 Hysteresis . 22
5.8 Test specimen . 22
5.9 Indication of the measured values . 22
5.10 Zero point related measurement . 22
5.11 Non-zero point related measurement . 23
5.12 Production set . 23
5.13 FBG strain sensor standard type . 23
5.14 FBG strain sensor series . 23
6 Features and characteristics to be reported . 23
6.1 Construction details and geometrical dimensions . 23
6.2 Configuration of the FBG strain sensor . 23
6.3 Temperature and humidity range . 23
6.4 Connecting requirement . 23
7 Features and characteristics to be measured . 24
7.1 Sampling and statistical evaluation . 24
7.1.1 Sampling . 24
7.1.2 Random sampling . 24
7.1.3 Type testing . 24
7.1.4 Series testing . 24
7.1.5 Individual sample testing . 24
7.1.6 Reporting the measuring result . 24
7.1.7 Sample conditioning . 25
7.1.8 Ambient test conditions . 25
7.1.9 Required type of test for individual characteristics . 25
7.2 Bragg wavelength λ . 25
B
7.2.1 General . 25
7.2.2 Measuring procedure . 26
7.2.3 Evaluation . 26
7.2.4 Reporting . 26
7.3 FBG spectral width. 26
7.3.1 Measuring procedure . 26
7.3.2 Evaluation . 27
7.3.3 Reporting . 27
7.4 FBG reflectivity . 27
7.4.1 Measuring procedure . 27
7.4.2 Evaluation . 27
7.4.3 Reporting . 28
7.5 FBG strain sensitivity . 28
7.5.1 General . 28
7.5.2 Tensile test set-up . 29
7.5.3 Measuring procedure tensile test . 29
7.5.4 Evaluation . 30
7.5.5 Reporting . 30
7.6 Gauge factor k . 30
7.6.1 General . 30
7.6.2 Bending test set-up . 30
7.6.3 Measurement procedure . 33
7.6.4 Evaluation . 34
7.6.5 Reporting . 34
7.7 Maximum strain range at room temperature . 34
7.7.1 General . 34
7.7.2 Test set-up . 35
7.7.3 Measuring procedure . 35
7.7.4 Evaluation . 35
7.7.5 Reporting . 36
7.8 Fatigue behaviour . 36
7.8.1 Test set-up . 36
7.8.2 Measuring procedure . 36
7.8.3 Evaluation . 37
7.8.4 Reporting . 37
7.9 Minimum operating radius of curvature . 37
7.9.1 Measuring procedure . 37
7.9.2 Evaluation . 37
7.9.3 Reporting . 37
7.10 Temperature and humidity ranges . 37
7.10.1 General . 37
7.10.2 Measuring procedure . 38
7.10.3 Evaluation . 38
7.10.4 Reporting . 38
7.11 Other environmental influences . 38
7.12 Temperature-induced strain response . 39
7.12.1 General . 39
7.12.2 Test set-up . 39
7.12.3 Measuring procedure . 40
7.12.4 Evaluation . 40
7.12.5 Reporting . 40
7.13 Proof test and lifetime considerations . 40
7.13.1 General . 40
...