BS EN IEC 60793-1-34:2021 – TC
$186.33
Tracked Changes. Optical fibres – Measurement methods and test procedures. Fibre curl
| Published By | Publication Date | Number of Pages |
| BSI | 2021 | 50 |
IEC 60793-1-34:2021 is available as IEC 60793-1-34:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60793-1-34:2021 establishes uniform requirements for the mechanical characteristic: fibre curl or latent curvature in uncoated optical fibres, i.e. a specified length of the fibre has been stripped from coating. Fibre curl has been identified as an important parameter for minimizing the splice loss of optical fibres when using passive alignment fusion splicers or active alignment mass fusion splicers.Two methods are recognized for the measurement of fibre curl, in uncoated optical fibres: – method A: side view microscopy; – method B: laser beam scattering. Both methods measure the radius of curvature of an uncoated fibre by determining the amount of deflection that occurs as an unsupported fibre end is rotated about the fibre’s axis. Method A uses visual or digital video methods to determine the deflection of the fibre while method B uses a line sensor to measure the maximum deflection of one laser beam relative to a reference laser beam. By measuring the deflection behaviour of the fibre as it is rotated about its axis and understanding the geometry of the measuring device, the fibre’s radius of curvature can be calculated from simple circular models, the derivation of which are given in Annex C. Both methods are applicable to type B optical fibres as described in IEC 60793 (all parts). Method A is the reference test method, used to resolve disputes. This third edition cancels and replaces the second edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – modification of several derivation equations for laser scattering; – change of angular increment from 10° to 30° to 10° to 45°; – change of Annex B from informative to normative.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | 30440510 |
| 27 | A-30394798 |
| 28 | undefined |
| 31 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 33 | English CONTENTS |
| 35 | FOREWORD |
| 37 | 1 Scope 2 Normative references 3 Terms and definitions |
| 38 | 4 Apparatus 4.1 Principle 4.2 Fibre holding fixture 4.3 Fibre rotator 4.4 Deflection measurement device 4.5 Computer (optional) 5 Sample preparation 6 Procedure 6.1 General 6.2 Mounting of the fibre |
| 39 | 6.3 Rotation 7 Calculation 8 Result 9 Specification information |
| 40 | Annex A (normative) Fibre curl by side view microscopy A.1 Principle Figures Figure A.1 – Schematic diagram for apparatus to measure fibre curl using an optical microscope |
| 41 | A.2 Apparatus A.2.1 Deflection measurement device Figure A.2 – Schematic diagram for apparatus to measure fibre curl using a laser micrometre Figure A.3 – Schematic diagram for apparatus to measure fibre curl while securing the sample in a ferrule |
| 42 | A.2.2 Video camera and monitor A.2.3 Digital image analysis system (optional) A.3 Test procedure A.3.1 General A.3.2 Procedure for the extrema technique A.3.3 Procedure for the Fourier fitting technique A.4 Calculations A.4.1 Extrema technique calculation A.4.2 Fourier fitting technique calculation |
| 43 | A.4.3 Computation of fibre curl |
| 44 | Annex B (normative) Fibre curl by laser beam scattering B.1 Principle B.2 Apparatus B.2.1 Light source B.2.2 Detector B.3 Test procedure B.3.1 General B.3.2 Procedure for the extrema technique B.3.3 Procedure for the Fourier fitting technique B.4 Calculations B.4.1 Extrema technique calculation |
| 45 | B.4.2 Fourier fitting technique calculation B.4.3 Computation of fibre curl Figure B.1 – Schematic diagram of optical curl by laser beam scattering |
| 46 | Annex C (informative) Derivation of the circular fibre curl model C.1 Derivation of equations for side view microscopy Figure C.1 – Geometrical layout of side view microscopy fibre curl measurement |
| 47 | C.2 Derivation of equations for the laser scattering method Figure C.2 – Geometrical layout of laser scattering fibre curl measurement |
