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BS EN IEC 61757-3-2:2022

BS EN IEC 61757-3-2:2022

$198.66

Fibre optic sensors – Acoustic sensing and vibration measurement. Distributed sensing

Published By Publication Date Number of Pages
BSI 2022 56
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This part of IEC 61757 specifies terminology, characteristic performance parameters, related test and calculation methods, and specific test equipment for interrogation units used in distributed fibre optic acoustic sensing and vibration measurement systems. This document refers to Rayleigh backscatter and phase detection method by phase-sensitive coherent optical time-domain reflectometry (ϕ-OTDR) only. Quasi-static and low frequency operation modes are not covered by this document. Generic specifications for fibre optic sensors are defined in IEC 61757.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 Blank Page
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions
14 Figures
Figure 1 – Distributed acoustic sensing system
16 3.2 Abbreviated terms
17 3.3 Symbols
Figure 2 – Signal parameters relating to time series and their spatial point identification
18 4 Performance parameters of a distributed acoustic sensing system
5 Test apparatus for performance parameter determination
5.1 Simulated fibre sensor (SFS)
19 5.2 Fibre stretcher
Figure 3 – Simulated fibre sensor
Figure 4 – Configuration for SFS showing the locations TP1, TP2, and TP3
20 5.3 Signal generation and amplification instrumentation
5.4 Optical attenuator
5.5 Isolation chamber
21 6 Test procedures of performance parameters
6.1 General
6.2 Dynamic range
6.2.1 General
6.2.2 Set-up
6.2.3 Stimulus
Figure 5 – Test set-up for dynamic range test
22 6.2.4 Data collection and processing
23 Figure 6 – Example of a strain stimulus signal andrecovered phase of IU response with a limit at 17 s
24 6.2.5 Data reporting
6.3 Frequency response
6.3.1 General
6.3.2 Set-up
Figure 7 – Example of a zoom view of strain stimulus signal andrecovered phase of IU response showing a phase jump at 16,98 s
25 6.3.3 Stimulus
6.3.4 Data collection and processing
Figure 8 – Test set-up for frequency response test
26 6.3.5 Data reporting
Figure 9 – Magnitude response showing the 40 stimulus signals all with magnitude
27 Figure 10 – Interrogation unit response to test stimulus,scaled in strain units, shown in the frequency domain
28 6.4 Fidelity
6.4.1 General
6.4.2 Set-up
6.4.3 Stimulus
Figure 11 – Interrogation unit normalized frequency response
Figure 12 – Test set-up for fidelity test
29 6.4.4 Data collection and processing
6.4.5 Data reporting
6.5 Self-noise
6.5.1 General
6.5.2 Set-up
30 6.5.3 Stimulus
6.5.4 Data collection and processing
Figure 13 – Test set-up for self-noise
31 Figure 14 – 2D data field representing the time varyingacoustic field as a function of distance
32 Figure 15 – System noise floor data processing schematic
33 6.5.5 Data reporting
6.6 Spatial resolution
6.6.1 General
Figure 16 – Example plot of self-noise data
34 6.6.2 Set-up
6.6.3 Stimulus
6.6.4 Data collection and processing
Figure 17 – Test set-up for spatial resolution test
35 6.6.5 Data reporting
Figure 18 – Spatial sample points to be used for spatial resolution evaluation
36 Figure 19 – Graphical plotting approach used to determine spatial resolution
37 6.7 Crosstalk
6.7.1 General
6.7.2 Set-up
6.7.3 Stimulus
6.7.4 Data collection and processing
Figure 20 – Test set-up for crosstalk measurement
38 6.7.5 Data reporting
6.8 Loss budget
6.8.1 General
Figure 21 – Highlighted points to be sampled for crosstalk test
Figure 22 – Example plot for crosstalk test results
39 6.8.2 Set-up
6.8.3 Stimulus
6.8.4 Data collection and processing
6.8.5 Data reporting
Figure 23 – Test set-up for loss budget test
40 6.9 Sensor reflection robustness
6.9.1 General
6.9.2 Set-up
41 Figure 24 – Test configurations for sensor reflection robustness
42 6.9.3 Stimulus
Figure 25 – Fabrication examples for creating partial reflections
43 6.9.4 Data collection, processing, and reporting
44 Annex A (informative)Conversion of optical phase measurement to strain
46 Table A.1 – Optical phase and strain relationships
47 Annex B (normative)Requirements for low uncertainty measurement
B.1 Single tone stimulus testing
Figure B.1 – Fibre stretcher spatial sample points
48 B.2 Frequency response testing
Figure B.2 – Frequency domain plot of single tone stimulus
49 Figure B.3 – Frequency response plot of single tone stimulus
50 Annex C (informative)FFT window functions
C.1 Flat-top window used for frequency domain measurements of spectral peaks
Figure C.1 – Flat-top window and its Fourier transform characteristics
51 C.2 Window functions used for frequency domain noise measurements
Figure C.2 – Blackman-Harris window and its Fourier transform characteristics
52 Figure C.3 – Hamming window and its Fourier transform characteristics
54 Bibliography

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