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 |
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 Figure 1 – Sampling on a chord |
| 14 | 4.2.3 Multidimensional scanning Figure 2 – 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 – 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 – Refracted near-field method – Cell Figure A.2 – 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 – Typical index profile line scan of a category A1 fibre Figure A.4 – 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 – Transmitted near-field B.1 Introductory remarks B.2 Apparatus B.2.1 Typical arrangement Figure B.1 – Typical arrangement, grey scale technique |
| 24 | B.2.2 Light sources Figure B.2 – 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 – 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 – 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 – 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 – 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 – Filtering concept |
| 41 | E.2.3 Pre-processing of one-dimensional near-field data |
| 42 | Figure E.2 – 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 60793-1-20:2014:2016 Edition
Optical fibres – Measurement methods and test procedures. Fibre geometry Published By Publication Date Number…
