1、End-face image analysis procedure for the calibration of optical fibre geometry test sets (IEC 61745:2017)BS EN 61745:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61745 October 2017 ICS 33.180.01 English Ver
2、sion End-face image analysis procedure for the calibration of optical fibre geometry test sets (IEC 61745:2017) Procdure danalyse dimage dextrmit pour ltalonnage de dispositifs dessais de gomtrie des fibres optiques (IEC 61745:2017) Endflchen-Bildanalyseverfahren fr die Kalibrierung von Prfeinrichtu
3、ngen fr die Geometrie von Lichtwellenleitern (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
4、 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 a
5、ny 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
6、, 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,
7、 Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any for
8、m and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61745:2017 E National forewordThis British Standard is the UK implementation of EN 61745:2017. It is identical to IEC 61745:2017. It supersedes BS IEC 61745:1998, which is withdrawn.The UK participation in its preparation was ent
9、rusted to Technical Committee GEL/86, Fibre optics.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British
10、 Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 95434 4ICS 33.180.01Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November
11、 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61745:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61745 October 2017 ICS 33.180.01 English Version End-face image analysis procedure for the calibration of optical fibre geometry test sets (IEC 6
12、1745:2017) Procdure danalyse dimage dextrmit pour ltalonnage de dispositifs dessais de gomtrie des fibres optiques (IEC 61745:2017) Endflchen-Bildanalyseverfahren fr die Kalibrierung von Prfeinrichtungen fr die Geometrie von Lichtwellenleitern (IEC 61745:2017) This European Standard was approved by
13、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 sta
14、ndards 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 langu
15、age 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, Franc
16、e, 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 Comit Europen
17、 de Normalisation Electrotechnique Europisches Komitee fr 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 BS EN 61745:2017E
18、N 61745:2017 2 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 EN 61745:2017. The following dates are fixed: latest date by which the document has to be im
19、plemented at national level by publication of an identical national standard or by endorsement (dop) 2018-06-01 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2020-09-01 Attention is drawn to the possibility that some of the elements of this docu
20、ment 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. 2 IEC 61745:2017 IEC 2017 C
21、ONTENTS 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 Calibrat
22、ion . 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 Deter
23、mination 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
24、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 uOp,I,F21 6.3.3 Determination of uI,F21 6.4 Evaluation of uncertain
25、ty in chromium mask measurement 21 6.4.1 General . 21 6.4.2 Determination of uOp,I,C. 21 6.4.3 Determination of uI,C21 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 uncer
26、tainty . 23 A.3 Type B evaluation of uncertainty . 23 A.4 Determining the combined standard uncertainty 24 A.5 Reporting 25 BS EN 61745:2017EN 61745:2017 2 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-
27、CENELEC parallel vote and approved by CENELEC as EN 61745:2017. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-06-01 latest date by which the national standards con
28、flicting with the document have to be withdrawn (dow) 2020-09-01 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 t
29、he International Standard IEC 61745:2017 was approved by CENELEC as a European Standard without any modification. 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
30、.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 Calibrat
31、ion 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 measureme
32、nt 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 uncert
33、ainty in fibre measurement . 20 6.3.1 General . 20 6.3.2 Determination of uOp,I,F21 6.3.3 Determination of uI,F21 6.4 Evaluation of uncertainty in chromium mask measurement 21 6.4.1 General . 21 6.4.2 Determination of uOp,I,C. 21 6.4.3 Determination of uI,C21 6.5 Summary 22 7 Documentation 22 7.1 Re
34、cords 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 BS EN 61745:2017IEC 61745:2017 IEC
35、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 det
36、ermination 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 un
37、certainty 31 D.3 Students 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 o
38、f 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 s
39、tandards . 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 co
40、ncentricity error measurement 36 G.1.1 General . 36 G.1.2 Determination of u . 36 G.1.3 Determination of uOP36 G.1.4 Determination of CB . 36 G.1.5 Determination of uCB. 38 G.2 Correcting for concentricity bias 38 Annex H (informative) Estimation of uncertainty in the measurement of non-circularity
41、39 H.1 Method of estimating uncertainty in non-circularity measurement 39 H.2 Determination of u . 39 H.3 Determination of uOp39 H.4 Determination of NCB 39 H.4.1 General . 39 H.4.2 Method A: uncalibrated artefact . 40 H.4.3 Method B: calibrated artefact . 40 H.5 Determination of uNCB. 40 Bibliograp
42、hy 41 Figure 1 Example of a calibration chain and the accumulation of uncertainties . 13 BS EN 61745:2017IEC 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) E
43、xamples 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 un
44、certainty . 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 Students t distribution 31 Annex E (informative) Worked examples for the determination of uncertainties 33 E.1 General . 33 E.2 Example of determination of sca
45、ling 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 Gener
46、ation 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) Est
47、imation 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 uOP36 G.1.4 Determination of CB . 36 G.1.5 Determination of uCB. 38 G.2
48、 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 uOp39 H.4 Determination of NCB 39 H.4.1 General . 39
49、H.4.2 Method A: uncalibrated artefact . 40 H.4.3 Method B: calibrated artefact . 40 H.5 Determination of uNCB. 40 Bibliography 41 Figure 1 Example of a calibration chain and the accumulation of uncertainties . 13 4 IEC 61745:2017 IEC 2017 Figure B.1 Representation of a grid calibration mask . 26 Figure B.2 Representation of an annulus calibration mask . 27 Figure B.3 Derivation of correction offset . 28 Table D.1 Values of t for specified confidence level . 32 Table G.1 Measured values for an
