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BS EN 60793-1-20:2014:2016 Edition

BS EN 60793-1-20:2014:2016 Edition

$189.07

Optical fibres – Measurement methods and test procedures. Fibre geometry

Published By Publication Date Number of Pages
BSI 2016 48
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This part of IEC 60793 establishes uniform requirements for measuring the geometrical characteristics of uncoated optical fibres.

The geometry of uncoated optical fibres directly affect splicing, connectorization and cabling and so are fundamental parameters requiring careful specification, quality control, and thus measurement.

PDF Catalog

PDF Pages PDF Title
4 Foreword
Endorsement notice
5 Annex ZA (normative) Normative references to international publications with their corresponding European publications
6 English
CONTENTS
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms, definitions and symbols
12 4 Overview of method
4.1 General
4.2 Scanning methods
4.2.1 General
13 4.2.2 One-dimensional scan sources of error
Figures
FigureĀ 1 ā€“ Sampling on a chord
14 4.2.3 Multidimensional scanning
FigureĀ 2 ā€“ Scan of a non-circular body
15 4.3 Data reduction
4.3.1 Simple combination of few-angle scan sets
4.3.2 Ellipse fitting of several-angle or raster data sets
5 Reference test method
6 Apparatus
7 Sampling and specimens
7.1 Specimen length
7.2 Specimen end face
8 Procedure
16 9 Calculations
10 Results
11 Specification information
17 Annex A (normative) Requirements specific to Method A ā€“ Refracted near-field
A.1 Introductory remarks
A.2 Apparatus
A.2.1 Typical arrangement
A.2.2 Source
A.2.3 Launch optics
18 A.2.4 XYZ positioner (scanning stage)
A.2.5 Blocking disc
Figure A.1 ā€“ Refracted near-field method ā€“ Cell
Figure A.2 ā€“ Typical instrument arrangement
19 A.2.6 Collection optics and detector
A.2.7 Computer system
A.2.8 Immersion cell
A.3 Sampling and specimens
A.4 Procedure
A.4.1 Load and centre the fibre
20 A.4.2 Line scan
A.4.3 Raster scan
A.4.4 Calibration
A.5 Index of refraction calculation
21 Figure A.3 ā€“ Typical index profile line scan of a category A1 fibre
Figure A.4 ā€“ Typical raster index profile on a category A1 fibre
22 A.6 Calculations
A.7 Results
23 Annex B (normative) Requirements specific to Method B ā€“ Transmitted near-field
B.1 Introductory remarks
B.2 Apparatus
B.2.1 Typical arrangement
Figure B.1 ā€“ Typical arrangement, grey scale technique
24 B.2.2 Light sources
Figure B.2 ā€“ Typical arrangement, mechanical scanning technique
25 B.2.3 Fibre support and positioning apparatus
B.2.4 Cladding mode stripper
B.2.5 Detection
26 B.2.6 Magnifying optics
27 B.2.7 Video image monitor (video grey-scale technique)
B.2.8 Computer
B.3 Sampling and specimens
B.4 Procedure
B.4.1 Equipment calibration
B.4.2 Measurement
28 Figure B.3 ā€“ Typical 1-D near-field scan, category A1 core
29 B.5 Calculations
B.6 Results
Figure B.4 – Typical raster near-field data, category A1 fibre
30 Annex C (normative) Edge detection and edge table construction
C.1 Introductory remarks
C.2 Boundary detection by decision level
C.2.1 General approach
31 C.2.2 Class A multimode fibre core reference level and k factor
Figure C.1 ā€“ Typical one-dimensional data set, cladding only
32 C.2.3 Class B and C single-mode fibres
C.2.4 Direct geometry computation of one-dimensional data
Figure C.2 ā€“ Typical graded index core profile
33 C.3 Assembling edge tables from raw data
C.3.1 General
C.3.2 Edge tables from raster data
Figure C.3 ā€“ Raster data, cladding only
34 C.3.3 Edge tables from multi-angular one-dimensional scans
35 Annex D (normative) Edge table ellipse fitting and filtering
D.1 Introductory remarks
D.2 General mathematical expressions for ellipse fitting
36 D.3 Edge table filtering
37 D.4 Geometric parameter extraction
38 Annex E (informative) Fitting category A1 core near-field data to a power law model
E.1 Introductory remarks
E.2 Preconditioning data for fitting
E.2.1 Motivation
E.2.2 Transformation of a two-dimensional image to one-dimensionalradial near-field
40 Figure E.1 ā€“ Filtering concept
41 E.2.3 Pre-processing of one-dimensional near-field data
42 Figure E.2 ā€“ Illustration of 1-D near-field preconditioning, typical video line
43 E.2.4 Baseline subtraction
E.3 Fitting a power-law function to an category A1 fibre near-field profile
45 Annex F (informative) Mapping class A core diameter measurements
F.1 Introductory remarks
F.2 Mapping function
46 Bibliography

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BS EN 60793-1-20:2014
$189.07