IEC 60793-1-34:2021

Optical fibres - Part 1-34: Measurement methods and test procedures - Fibre curl

IEC 60793-1-34:2021

Name:IEC 60793-1-34:2021   Standard name:Optical fibres - Part 1-34: Measurement methods and test procedures - Fibre curl
Standard number:IEC 60793-1-34:2021   language:English language
Release Date:09-Feb-2021   technical committee:SC 86A - Fibres and cables
Drafting committee:WG 1 - TC 86/SC 86A/WG 1   ICS number:33.180.10 - Fibres and cables

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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rights. IEC shall not be held responsible for identifying any or all such patent rights.
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
...

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