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IEC 60793-1-34
Edition 3.0 2021-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-34: Measurement methods and test procedures – Fibre curl
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IEC 60793-1-34
Edition 3.0 2021-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-34: Measurement methods and test procedures – Fibre curl
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-9430-7
– 2 – IEC 60793-1-34:2021 RLV IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Apparatus . 7
4.1 Principle . 7
4.2 Fibre holding fixture . 7
4.3 Fibre rotator . 7
4.4 Deflection measurement device . 7
4.5 Computer (optional) . 7
5 Sample preparation . 7
6 Procedure . 7
6.1 General . 7
6.2 Mounting of the fibre . 7
6.3 Rotation . 8
7 Calculation . 8
8 Result . 8
9 Specification information . 8
Annex A (normative) Fibre curl by side view microscopy . 9
A.1 Principle . 9
A.2 Apparatus . 10
A.2.1 Deflection measurement device . 10
A.2.2 Video camera and monitor . 11
A.2.3 Digital image analysis system (optional) . 11
A.3 Test procedure . 11
A.3.1 General . 11
A.3.2 Procedure for the extrema technique . 11
A.3.3 Procedure for the Fourier fitting technique . 11
A.4 Calculations . 11
A.4.1 Extrema technique calculation . 11
A.4.2 Fourier fitting technique calculation . 11
A.4.3 Computation of fibre curl. 12
Annex B (informative normative) Fibre curl by laser beam scattering . 13
B.1 Principle . 13
B.2 Apparatus . 13
B.2.1 Light source . 13
B.2.2 Detector . 13
B.3 Test procedure . 13
B.3.1 General . 13
B.3.2 Procedure for the extrema technique . 13
B.3.3 Procedure for the Fourier fitting technique . 13
B.4 Calculations . 13
B.4.1 Extrema technique calculation . 13
B.4.2 Fourier fitting technique calculation . 14
B.4.3 Computation of fibre curl. 14
Annex C (informative) Derivation of the circular fibre curl model . 15
C.1 Derivation of equations for side view microscopy . 15
C.2 Derivation of equations for the laser scattering method . 16
Figure A.1 – Schematic diagram for apparatus to measure fibre curl using an optical
microscope . 9
Figure A.2 – Schematic diagram for apparatus to measure fibre curl using a laser
micrometer. 10
Figure A.3 – Schematic diagram for apparatus to measure fibre curl while securing the
sample in a ferrule . 10
Figure B.1 – Schematic diagram of optical curl by laser beam scattering . 14
Figure C.1 – Geometrical layout of side view microscopy fibre curl measurement . 15
Figure C.2 – Geometrical layout of laser scattering fibre curl measurement . 16
– 4 – IEC 60793-1-34:2021 RLV IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-34: Measurement methods and test procedures – Fibre curl
FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60793-1-34:2006. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
International Standard IEC 60793-1-34 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
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:
a) modification of several derivation equations for laser scattering;
b) change of angular increment from 10° to 30° to 10° to 45°;
c) change of Annex B from informative to normative.
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/1971/CDV 86A/1994/RVC
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in
...