EN 61745:2017
(Main)End-face image analysis procedure for the calibration of optical fibre geometry test sets
End-face image analysis procedure for the calibration of optical fibre geometry test sets
IEC 61745:2017 describes the calibration of test sets that perform end-face image analysis, also known as "near-field" or "grey-scale" analysis. The principles, however, can be applied to test sets of a different type. The procedures outlined are performed by calibration laboratories and by the manufacturers or users of geometry test sets, for the purpose of calibrating geometry test sets and for evaluating the uncertainties in measurements made on calibrated test sets. The calibration of fibre coating or cable measurement test sets is not covered by this document. This second edition cancels and replaces the first edition, published in 1998, and constitutes a technical revision.This edition includes the following significant technical changes with respect to the previous edition: a) removal of the limitation of single mode optical fibre geometry test sets to include multimode; b) addition of a new annex as mathematical basis. Keywords: end-face image analysis, optical fibre geometry test sets
Endflächen-Bildanalyseverfahren für die Kalibrierung von Prüfeinrichtungen für die Geometrie von Lichtwellenleitern
Procédure d'analyse d'image d’extrémité pour l'étalonnage de dispositifs d'essais de géométrie des fibres optiques
IEC 61745:2017 décrit l'étalonnage de dispositifs d'essais qui effectuent une analyse d'image d’extrémité, également appelée "analyse de champ proche" ou "analyse d'échelle de gris". Les principes peuvent toutefois être appliqués à des dispositifs d'essais d'un type différent. Les procédures indiquées sont réalisées par des laboratoires d'étalonnage et par les fabricants ou les utilisateurs de dispositifs d'essais de géométrie, à des fins d'étalonnage de dispositifs d’essais de géométrie et d'évaluation des incertitudes des mesures effectuées sur des dispositifs d'essais étalonnés. Le présent document ne couvre pas l'étalonnage de dispositifs d’essais de mesure de câbles ou de revêtements de fibres. Cette deuxième édition annule et remplace la première édition parue en 1998, dont elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) retrait de la restriction des dispositifs d'essais de géométrie aux fibres optiques unimodales pour inclure les fibres optiques multimodales; b) ajout d'une nouvelle annexe portant sur les bases mathématiques. Mots clés: analyse d’image d’extrémité, essais de géométrie des fibres optiques
Postopek analize čelne slike za umerjanje pribora za preskušanje geometrije optičnih vlaken (IEC 61745:2017)
Ta dokument opisuje kalibracijo kompletov preskusov, ki izvajajo analizo čelne slike, imenovano tudi analiza bližnjega polja (»near-field«) oziroma analiza lestvice sivih tonov (»grey-scale«). Načela se lahko uporabijo za različne vrste kompletov preskusov.
Opisane postopke izvajajo kalibracijski laboratoriji in proizvajalci ali uporabniki geometrijskih kompletov preskusov za namene kalibriranja geometrijskih kompletov preskusov in ocenjevanja negotovosti pri meritvah, izvedenih v okviru kalibriranih kompletov preskusov. Dokument ne zajema kalibracije kompletov preskusov za premaz vlaken ali meritve kablov.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2018
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End-face image analysis procedure for the calibration of optical fibre geometry test sets
(IEC 61745:2017)
Ta slovenski standard je istoveten z: EN 61745:2017
ICS:
33.180.10 2SWLþQD YODNQDLQNDEOL Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 61745
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2017
ICS 33.180.01
English Version
End-face image analysis procedure for the calibration of optical
fibre geometry test sets
(IEC 61745:2017)
Procédure d'analyse d'image d'extrémité pour l'étalonnage Endflächen-Bildanalyseverfahren für die Kalibrierung von
de dispositifs d'essais de géométrie des fibres optiques Prüfeinrichtungen für die Geometrie von Lichtwellenleitern
(IEC 61745:2017) (IEC 61745:2017)
This European Standard was approved by CENELEC on 2017-09-01. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61745:2017 E
European foreword
The text of document 86/510/CDV, future edition 2 of IEC 61745, prepared by IEC/TC 86 "Fibre
optics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
latest date by which the document has to be implemented at (dop) 2018-06-01
national level by publication of an identical national
standard or by endorsement
latest date by which the national standards conflicting with (dow) 2020-09-01
the document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61745:2017 was approved by CENELEC as a European
Standard without any modification.
IEC 61745 ®
Edition 2.0 2017-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
End-face image analysis procedure for the calibration of optical fibre geometry
test sets
Procédure d'analyse d'image d’extrémité pour l'étalonnage de dispositifs
d'essais de géométrie des fibres optiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-4614-6
– 2 – IEC 61745:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General information and preparation for calibration . 11
4.1 Geometrical parameters of optical fibres . 11
4.2 Description of geometry test sets . 11
4.3 Calibration standard requirements . 12
5 Calibration . 12
5.1 General . 12
5.2 Rationale for calibration of geometry test sets . 12
5.2.1 General . 12
5.2.2 Verification of calibration state . 13
5.3 Calibration procedure . 14
5.3.1 General advice and organization. 14
5.3.2 Test requirements . 14
5.3.3 Calibration standard requirements . 14
5.3.4 Determination of calibration factors. 14
5.4 Check calibration procedure . 16
5.5 Spatial linearity . 16
5.6 Calibration of core/cladding concentricity error measurement. 17
5.7 Calibration of non-circularity measurement . 17
6 Evaluation of uncertainties . 17
6.1 General . 17
6.2 Evaluation of uncertainty in test set calibration . 18
6.2.1 General . 18
6.2.2 Uncertainty in scaling factor . 18
6.2.3 Uncertainty in offset correction factor . 19
6.3 Evaluation of uncertainty in fibre measurement . 20
6.3.1 General . 20
6.3.2 Determination of u . 21
Op,I,F
6.3.3 Determination of u' . 21
I,F
6.4 Evaluation of uncertainty in chromium mask measurement. 21
6.4.1 General . 21
6.4.2 Determination of u . 21
Op,I,C
6.4.3 Determination of u′ . 21
I,C
6.5 Summary . 22
7 Documentation . 22
7.1 Records . 22
Annex A (normative) Mathematical basis for measurement uncertainty calculations . 23
A.1 General . 23
A.2 Type A evaluation of uncertainty . 23
A.3 Type B evaluation of uncertainty . 23
A.4 Determining the combined standard uncertainty . 24
A.5 Reporting . 25
IEC 61745:2017 © IEC 2017 – 3 –
Annex B (informative) Derivation of calibration factors . 26
B.1 Derivation of scaling factors . 26
B.2 Derivation of correction offset factor . 27
Annex C (informative) Examples for the determination of calibration factors . 29
C.1 Example of determination of scaling factor . 29
C.2 Example of determination of offset correction factor . 29
Annex D (informative) Calculation of uncertainties . 30
D.1 General . 30
D.1.1 Overview . 30
D.1.2 Examples of type B evaluation of uncertainty . 30
D.2 Combining sources of uncertainty . 30
D.2.1 General . 30
D.2.2 Example of combining several sources of uncertainty . 31
D.3 Student's t distribution . 31
Annex E (informative) Worked examples for the determination of uncertainties . 33
E.1 General . 33
E.2 Example of determination of scaling factor uncertainty . 33
E.3 Example of determination of correction offset uncertainty . 33
E.4 Example of determination of fibre measurement uncertainty. 34
E.5 Example of determination of chromium mask measurement uncertainty . 34
Annex F (informative) Generation of working standards . 35
F.1 Generation of working standards . 35
F.1.1 General . 35
F.1.2 Measurement conditions . 35
F.2 Procedure for generation of working standards . 35
F.2.1 In the case where the infant artefact is a fibre. 35
F.2.2 In the case where the infant artefact is a chromium-on-glass artefact . 35
Annex G (informative) Estimation of uncertainty in the measurement of core/cladding
concentricity error . 36
G.1 Method of estimating uncertainty in concentricity error measurement . 36
G.1.1 General . 36
G.1.2 Determination of u . 36
G.1.3 Determination of u . 36
OP
G.1.4 Determination of CB . 36
G.1.5 Determination of u . 38
CB
G.2 Correcting for concentricity bias . 38
Annex H (informative) Estimation of uncertainty in the measurement of non-circularity . 39
H.1 Method of estimating uncertainty in non-circularity measurement . 39
H.2 Determination of u . 39
H.3 Determination of u . 39
Op
H.4 Determination of NCB .
...
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