BS EN IEC 61757-1-1:2020

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Fibre optic sensors – Strain measurement. Strain sensors based on fibre Bragg gratings

Published By	Publication Date	Number of Pages
BSI	2020	60

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Categories: 33.180.99 - Other fibre optic equipment, BSI

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Description

IEC 61757-1-1:2020 is available as IEC 61757-1-1:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61757-1-1:2020 defines detail specifications for fibre optic sensors using one or more fibre Bragg gratings (FBG) as the sensitive element for strain measurements. Generic specifications for fibre optic sensors are defined in IEC 61757. This document specifies the most important features and characteristics of a fibre optic sensor for strain measurements, based on use of an FBG as the sensitive element, and defines the procedures for their determination. Furthermore, it specifies basic performance parameters and characteristics of the corresponding measuring instrument to read out the optical signal from the FBG. This document refers to the measurement of static and dynamic strain values in a range of frequencies. A blank detail specification is provided in Annex B. This second edition cancels and replaces the first edition published in 2016. This edition constitutes a technical revision. This edition includes the following technical changes with respect to the previous edition: – update of cited standards; – clarification of definitions and test specifications.

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PDF Pages	PDF Title
2	undefined
5	Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7	English CONTENTS
10	FOREWORD
12	INTRODUCTION
13	1 Scope 2 Normative references
14	3 Terms and definitions
16	Figures Figure 1 – Characteristics of the Bragg grating reflectance spectrum
19	4 Symbols
21	5 Structures and characteristics 5.1 Fibre Bragg grating (FBG)
22	Figure 2 – Operation principle of a fibre Bragg grating in an optical waveguide
23	Figure 3 – Example of a reflection spectrum of a fibre Bragg grating array
24	5.2 FBG strain sensor configuration 5.3 Measuring point and installation Figure 4 – Gauge length between two attachment points
25	5.4 Gauge length 5.5 Strain and reference strain 5.6 Reference wavelength
26	5.7 Stability behaviour 5.7.1 Drift and creep 5.7.2 Shape stability of the Bragg grating peak 5.7.3 Hysteresis
27	5.8 Test specimen 5.9 Indication of the measured values 5.10 Zero point related measurement 5.11 Non-zero point related measurement 5.12 Production set 5.13 FBG strain sensor standard type 5.14 FBG strain sensor series
28	6 Features and characteristics to be reported 6.1 Construction details and geometrical dimensions 6.2 Configuration of the FBG strain sensor 6.3 Temperature and humidity range 6.4 Connecting requirement 7 Features and characteristics to be measured 7.1 Sampling and statistical evaluation 7.1.1 Sampling 7.1.2 Random sampling
29	7.1.3 Type testing 7.1.4 Series testing 7.1.5 Individual sample testing 7.1.6 Reporting the measuring result 7.1.7 Sample conditioning 7.1.8 Ambient test conditions 7.1.9 Required type of test for individual characteristics
30	7.2 Bragg wavelength λB 7.2.1 General Figure 5 – Reflection spectrum of a FBG (calculated (left) and measured spectrum (right)) Tables Table 1 – Required type of test for individual characteristics
31	7.2.2 Measuring procedure 7.2.3 Evaluation 7.2.4 Reporting 7.3 FBG spectral width 7.3.1 Measuring procedure
32	7.3.2 Evaluation 7.3.3 Reporting 7.4 FBG reflectivity 7.4.1 Measuring procedure 7.4.2 Evaluation 7.4.3 Reporting Figure 6 – Determination of RFBG from the FBG reflection spectrum (left, Equation (9)) and transmission spectrum (right, Equation (10))
33	7.5 FBG strain sensitivity 7.5.1 General 7.5.2 Tensile test set-up
34	7.5.3 Measuring procedure tensile test 7.5.4 Evaluation Figure 7 – Example set-up of a tensile test facility
35	7.5.5 Reporting 7.6 Gauge factor k 7.6.1 General 7.6.2 Bending test set-up
36	Figure 8 – Test layout for the 4-point bending test with scheme of lateral force and bending moment curves Figure 9 – Determination of the strain via displacement measurement
37	7.6.3 Measurement procedure Figure 10 – Whole-surface applied sensor on a bended flexural beam
38	7.6.4 Evaluation
39	7.6.5 Reporting 7.7 Maximum strain range at room temperature 7.7.1 General 7.7.2 Test set-up 7.7.3 Measuring procedure 7.7.4 Evaluation
40	7.7.5 Reporting 7.8 Fatigue behaviour 7.8.1 Test set-up 7.8.2 Measuring procedure
41	7.8.3 Evaluation 7.8.4 Reporting 7.9 Minimum operating radius of curvature 7.9.1 Measuring procedure 7.9.2 Evaluation 7.9.3 Reporting Figure 11 – Test specimen with applied FBG strain sensor
42	7.10 Temperature and humidity ranges 7.10.1 General 7.10.2 Measuring procedure 7.10.3 Evaluation
43	7.10.4 Reporting 7.11 Other environmental influences 7.12 Temperature-induced strain response 7.12.1 General
44	7.12.2 Test set-up 7.12.3 Measuring procedure 7.12.4 Evaluation 7.12.5 Reporting
45	7.13 Proof test and lifetime considerations 7.13.1 General 7.13.2 Measuring procedure
46	7.13.3 Evaluation 7.13.4 Reporting 8 Recommendations for use of FBG measuring instruments
48	Annexes Annex A (normative) Further properties of FBG strain sensors A.1 General A.2 Extended explanation of FBG side-lobes for different conditions of use
49	Figure A.1 – Side-lobes in the case of a single FBG strain sensor
50	Figure A.2 – Fundamental peaks and detected side-lobe peaks in the case of serially multiplexed FBGs Figure A.3 – Spectral peaks in the case of serially multiplexed FBGs
51	Figure A.4 – Parameters to identify fundamental peaks and side-lobes
52	Figure A.5 – Identification of fundamental peaks and side-lobes
53	Annex B (informative) Blank detail specification B.1 General B.2 Mechanical setup of the FBG strain sensor B.3 Operational characteristics of the FBG strain sensor
54	B.4 Limiting parameters of the FBG strain sensor B.5 Temperature data of the FBG strain sensor B.6 Further information of the FBG strain sensor given upon request B.7 Key performance data of the FBG measuring instrument
56	Annex C (informative) Polarization effects
57	Annex D (informative) Applied FBG strain sensors D.1 General D.2 Recommended bonding process
58	Bibliography

Additional information

Status	Definitive
Pages	60
Publication Date	2020-05-28
ISBN	978 0 539 03107 2
Standard Number	BS EN IEC 61757-1-1:2020
Title	Fibre optic sensors – Strain measurement. Strain sensors based on fibre Bragg gratings
Identical National Standard Of	EN 61757-1-1 Ed.2.0, IEC 61757-1-1 Ed.2.0
Replaces	BS EN 61757-1-1:2017
Descriptors	Probes, Optical measurement, Environmental testing, Visual inspection (testing), Testing conditions, Meteorological measurement, Radiation measurement, Optical fibres, Optical communication systems, Marking, Position, Designations, Velocity measurement, Mechanical testing, Chemical analysis and testing, Acoustic measurement, Magnetic field measurement, Detail specification, Electrical measurement, Classification systems, Fibre optics, Quality assurance systems, Electrical components, Electronic equipment and components, Force measurement, Assessed quality, Physical properties of materials, Electrical testing
Publisher	BSI
Committee	GEL/86/3
ICS Codes	33.180.99 - Other fibre optic equipment

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