1、BRITISH STANDARD BS EN 60793-1-46: 2002 Optical fibres Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance The European Standard EN 60793-1-46:2002 has the status of a British Standard ICS 33.180.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED B
2、Y COPYRIGHT LAWBS EN 60793-1-46:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 May 2002 BSI 23 May 2002 ISBN 0 580 39705 X Nation
3、al foreword This British Standard is the official English language version of EN 60793-1-46:2002. It is identical with IEC 60793-1-46:2001. It partly supersedes BS EN 188000:1994 which will be withdrawn upon publication of the full BS EN 60793-1 series of standards. The UK participation in its prepa
4、ration was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have
5、 the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement int
6、ernational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to in
7、clude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Eur
8、opean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, p
9、ages 2 to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60793-1-46 NORME EUROPENNE EUROPISCHE NORM February 2002 CENELEC European
10、 Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CE
11、NELEC members. Ref. No. EN 60793-1-46:2002 E ICS 33.180.10 Partly supersedes EN 188000:1992 English version Optical fibres Part 1-46: Measurement methods and test procedures - Monitoring of changes in optical transmittance (IEC 60793-1-46:2001) Fibres optiques Partie 1-46: Mthodes de mesure et procd
12、ures dessai - Contrle des variations du facteur de transmission optique (CEI 60793-1-46:2001) Lichtwellenleiter Teil 1-46: Messmethoden und Prfverfahren - berwachung der optischen bertragungsnderungen (IEC 60793-1-46:2001) This European Standard was approved by CENELEC on 2001-07-03. CENELEC members
13、 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
14、to the Central Secretariat 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 Central Secretariat has
15、the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United King
16、dom.EN 69703-1-642:200 - - 2 Foreword The text of document 86A/675/FDIS, future edition 1 of IEC 60793-1-46, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60793-1-46 on 2001-07-03. This European Sta
17、ndard supersedes subclause 4.27 (test method 316) and subclause 4.28 (test method 317) of EN 188000:1992. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-09-01 latest dat
18、e by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-07-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annexes A, B and ZA are normative. Annex ZA has been added by CENELEC. Compared to IEC 60793-1:1989 and IEC 60793-2:1
19、992, IEC/SC 86A has adopted a revised structure of the new IEC 60793 series: The individual measurement methods and test procedures for optical fibres are published as “Part 1-XX“; the product standards are published as “Part 2-XX“. The general relationship between the new series of EN 60793 and the
20、 superseded European Standards of the EN 188000 series is as follows: EN Title supersedes EN 60793-1-XX Optical fibres - Part 1-XX: Measurement methods and test procedures Individual subclauses of EN 188000:1992 EN 60793-2-XX Optical fibres - Part 2-XX: Product specifications EN 188100:1995 EN 18810
21、1:1995 EN 188102:1995 EN 188200:1995 EN 188201:1995 EN 188202:1995 EN 60793-1-4X consists of the following parts, under the general title: Optical fibres: - Part 1-40: Measurement methods and test procedures Attenuation - Part 1-41: Measurement methods and test procedures Bandwidth - Part 1-42: Meas
22、urement methods and test procedures Chromatic dispersion - Part 1-43: Measurement methods and test procedures Numerical aperture - Part 1-44: Measurement methods and test procedures Cut-off wavelength - Part 1-45: Measurement methods and test procedures Mode field diameter - Part 1-46: Measurement m
23、ethods and test procedures Monitoring of changes in optical transmittance - Part 1-47: Measurement methods and test procedures Macrobending loss - Part 1-48: Measurement methods and test procedures Under consideration - Part 1-49: Measurement methods and test procedures Under consideration _ Endorse
24、ment notice The text of the International Standard IEC 60793-1-46:2001 was approved by CENELEC as a European Standard without any modification. _ Page2 EN60793146:2002 BSI23May200260793-1-46 IEC:2001 3 CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references5 3 Reference test method5 4 Apparatus.5 5
25、 Sampling and specimens 6 5.1 Specimen length6 5.2 Specimen end face6 5.3 Specimen preparation6 5.4 Reference specimen6 6 Procedure.6 7 Calculations6 8 Results.6 8.1 Information to be provided with each measurement6 8.2 Information available upon request 6 9 Specification information.7 Annex A (norm
26、ative) Requirements specific to method A Change in transmittance by transmitted power .8 Annex B (normative) Requirements specific to method B Change in transmittance by backscattering.11 Annex ZA (normative) Normative references to international publications with their corresponding European public
27、ations 12 Figure A.1 Measurement of change in optical transmittance using reference specimen .9 Figure A.2 Measurement of change in optical transmittance using stabilized source9 Page3 EN60793146:2002 BSI23May200260793-1-46 IEC:2001 4 INTRODUCTION Publications in the IEC 60793-1 series concern measu
28、rement methods and test procedures as they apply to optical fibres. Within the same series several different areas are grouped, as follows: parts 1-10 to 1-19: General parts 1-20 to 1-29: Measurement methods and test procedures for dimensions parts 1-30 to 1-39: Measurement methods and test procedur
29、es for mechanical characteristics parts 1-40 to 1-49: Measurement methods and test procedures for transmission and optical characteristics parts 1-50 to 1-59: Measurement methods and test procedures for environmental characteristics. Page4 EN60793146:2002 BSI23May200260793-1-46 IEC:2001 5 OPTICAL FI
30、BRES Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance 1 Scope This part of IEC 60793 establishes uniform requirements for the monitoring of changes in optical transmittance, thereby assisting in the inspection of fibres and cables for commercial purpo
31、ses. This standard gives two methods for monitoring the changes in optical transmittance of optical fibres and cables that occur during mechanical or environmental testing, or both. It provides a monitor in the change of optical transmission characteristics arising from optical discontinuity, physic
32、al defects and modifications of the attenuation slope: method A: change in transmittance by transmitted power; method B: change in transmittance by backscattering. Methods A and B apply to the monitoring of all categories of the following fibres: class A: multimode fibres; class B: single-mode fibre
33、s. Information common to both measurements is contained in clauses 1 to 8, and information pertaining to each individual method appears in annexes A, and B respectively. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute prov
34、isions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of th
35、e normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60793-1-40, Optical fibres Part 1-40: Measurement methods and test procedures Att
36、enuation 3 Reference test method Under consideration. 4 Apparatus Annexes A and B include layout drawings and other equipment requirements that individually apply for each of the methods, respectively. Page5 EN60793146:2002 BSI23May200260793-1-46 IEC:2001 6 5 Sampling and specimens 5.1 Specimen leng
37、th The minimum length of the specimen shall be such that the changes in attenuation are compatible with the resolution of the measurement apparatus, and the non-linearities at the beginning and end of it shall not affect the results. 5.2 Specimen end face Prepare a flat end face, orthogonal to the f
38、ibre axis, at the input and output ends of each specimen. 5.3 Specimen preparation Prepare the specimen as described in the appropriate mechanical, environmental, or other test method specified. 5.4 Reference specimen In methods where a reference specimen is used, it shall comprise an identical kind
39、 of optical fibre or cable to the specimen and shall be linked between the optical divider and detector, as shown in figure A.1. It may be a short length of fibre. The condition of the reference specimen shall be constant during the whole test. 6 Procedure For individual procedures, see annexes A an
40、d B for methods A and B, respectively. 7 Calculations For calculation procedures, see the appropriate annex: A and B, respectively. 8 Results 8.1 Information to be provided with each measurement Report the following information with each measurement: date and title of measurement; identification of
41、specimen; optical source wavelength, ; specimen length; conditions of the environment and measurement equipment; changes in optical transmittance, D ; = 1,2,3, . preferably plotted in a graph versus test parameters. 8.2 Information available upon request The following information shall be available
42、upon request: measurement method used: A or B; type of optical source used and its spectral width (FWHM); Page6 EN60793146:2002 BSI23May200260793-1-46 IEC:2001 7 launching technique used; description of all key equipment; details of computation technique; date of latest calibration of measurement eq
43、uipment. 9 Specification information The detail specification shall specify the following information: type of fibre to be measured; failure or acceptance criteria; information to be reported; any deviations from the procedure that apply. Page7 EN60793146:2002 BSI23May200260793-1-46 IEC:2001 8 Annex
44、 A (normative) Requirements specific to method A Change in transmittance by transmitted power A.1 Apparatus A.1.1 General The arrangement shall provide a monitoring for optical transmittance with high resolution and good stability over the time and temperature changes given in the relevant product s
45、pecification. Figure A.1 is an example of a typical arrangement suitable for use when carrying out mechanical or environmental tests in a laboratory or factory. By comparison with a reference sample, it provides a measurement of the change in optical transmittance, corrected for any changes that mig
46、ht occur in the optical source. Connections shall have stable coupling conditions. Figure A.2 is an example of a typical arrangement suitable for use in the field, laboratory or factory where long-term tests are required, in cases where it is possible to stabilize the optical source by optical feedb
47、ack. If the stability of the optical source is compatible with the accuracy needed for the measurement, then the insertion loss measurement method (method B of IEC 60793-1-40) may be used. A.1.2 Optical source Use an suitable source such as a laser or light-emitting diode, emitting at wavelengths co
48、mpatible with the optical fibres under test. It is customary to modulate the optical source and wavelength selective optical filters may be used. A.1.3 Optical divider The optical divider shall have a splitting ratio that remains constant during the test. The splitting ratio and temperature stabilit
49、y shall be as shown in the relevant detail specification. Commercially available or custom built devices may be used. A.1.4 Optical detector The optical detector shall be of sufficient area to intercept all of the radiated power in the output cone and shall be sufficiently linear over the optical powers encountered. Page8 EN60793146:2002 BSI23May2002607
