1、BRITISH STANDARD BS EN 60793-1-21: 2002 Optical fibres Part 1-21: Measurement methods and test procedures Coating geometry The European Standard EN 60793-1-21:2002 has the status of a British Standard ICS 33.180.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 60793-1-2
2、1:2002 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 17 May 2002 BSI 17 May 2002 ISBN 0 580 39616 9 National foreword This British Stand
3、ard is the official English language version of EN 60793-1-21:2002. It is identical with IEC 60793-1-21:2001. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables, which has the responsibility to: A lis
4、t of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have 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 nu
5、mbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standa
6、rds Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standar
7、d does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments a
8、nd promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 15 , 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
9、. Date CommentsEUROPEAN STANDARD EN 60793-1-21 NORME EUROPENNE EUROPISCHE NORM March 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050
10、 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60793-1-21:2002 E ICS 33.180.10 English version Optical fibres Part 1-21: Measurement methods and test procedures Coating geometry (IEC 60793-1-21:2001) Fibres optique
11、s Partie 1-21: Mthodes de mesures et procdures dessai Gomtrie du revtement (CEI 60793-1-21:2001) Lichtwellenleiter Teil 1-21: Messmethoden und Prfverfahren - Beschichtungsgeometrie (IEC 60793-1-21:2001) This European Standard was approved by CENELEC on 2002-03-05. CENELEC members are bound to comply
12、 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 Central Secre
13、tariat 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 the same status as t
14、he 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 Kingdom.Foreword The tex
15、t of document 86A/686/FDIS, future edition 1 of IEC 60793-1-21, 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 60793-1-21 on 2002-03-05. The following dates were fixed: latest date by which the EN ha
16、s to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-03-01 Annexes designated “normative“ are part of the body of the standard. In
17、this standard, annexes A, B and ZA are normative. Annex ZA has been added by CENELEC. Compared to IEC 60793-1:1989 and IEC 60793-2:1992, 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
18、“Part 1-XX“; the product standards are published as “Part 2-XX“. The general relationship between the new series of EN 60793 and the 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 procedu
19、res Individual subclauses of EN 188000:1992 EN 60793-2-XX Optical fibres - Part 2-XX: Product specifications EN 188100:1995 EN 188101:1995 EN 188102:1995 EN 188200:1995 EN 188201:1995 EN 188202:1995 EN 60793-1-2X consists of the following parts, under the general title: Optical fibres: - Part 1-20:
20、Measurement methods and test procedures Fibre geometry - Part 1-21: Measurement methods and test procedures Coating geometry - Part 1-22: Measurement methods and test procedures Length measurement _ Endorsement notice The text of the International Standard IEC 60793-1-21:2001 was approved by CENELEC
21、 as a European Standard without any modification. _ Page2 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 3 CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references5 3 Overview of method5 4 Definitions 6 5 Reference test method6 6 Apparatus.6 7 Sampling and specimens 6 8 Procedure.6 9 Calculations6
22、10 Results.7 11 Specification information.7 Annex A (normative) Requirements specific to method A Side-view light distribution 8 Annex B (normative) Requirements specific to method B Mechanical measurement.12 Annex ZA (normative) Normative referneces to international publications with their correspo
23、nding European publications .15 Bibliography14 Figure A1 Schematic diagram of typical test equipment 8 Figure A.2 Side view of measurement set-up 9 Figure B1 Top view of a typical electronic micrometer system .12 Table 1 Measurement methods 5 Page3 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 4 I
24、NTRODUCTION Publications in the IEC 60793-1 series concern measurement 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 dime
25、nsions parts 1-30 to 1-39: Measurement methods and test procedures for mechanical charac- teristics 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 charac- teristics
26、. Page4 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 5 OPTICAL FIBRES Part 1-21: Measurement methods and test procedures Coating geometry 1 Scope This part of IEC 60793 establishes uniform requirements for measuring the coating geometry of optical fibre. Coating geometry measurements are fundamen
27、tal values that need to be known for subsequent procedures such as cabling, connectorization, splicing, handling and for making other measurements. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition
28、 cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60793-1-20, Optical fibres Part 1-20: Measurement methods and test procedures Fibre geometry 3 Overview of method This standard gives four methods for measuring fibre geometr
29、y characteristics which are given in terms of the following parameters: coating diameter; coating non-circularity; coating-cladding concentricity error. Table 1 Measurement methods Method Characteristics covered Fibre category(ies) covered Former designation A Side-view a All All b IEC 60793-1-A3 B
30、Mechanical Coating diameter and non-circularity All IEC 60793-1-A4 a For certain coating parameters evaluation, the cladding diameter should be measured using this procedure. However, due to the relatively poor accuracy of the method, this value of cladding diameter cannot be considered as an altern
31、ative to the values obtained by the already established test methods for glass geometry, for which reference should be made to IEC 60793-1-20. b Coating-cladding concentricity error is not defined for category A4 fibre. Both methods are conducted off-line during inspection. Neither of them is suitab
32、le for on-line, in-process measurements. Information common to both measurements appears in clauses 2 to 10. See also annexes A and B, for methods A and B, respectively. Page5 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 6 4 Definitions For the purpose of this part of IEC 60793, the following def
33、initions apply. 4.1 primary coating one or more layers of protective coating material applied to the fibre cladding surface during or after the drawing to preserve the cladding surface and to give a minimum amount of required protection (e.g. a 250 m protective coating) 4.2 secondary or “buffer“ coa
34、ting one or more layers of coating material applied over one or more layers of primary coated fibres in order to give additional required protection or to arrange fibres together in a particular structure (e.g. a 900 m “buffer“ coating, “tight jacket“ or “ribbon coating“) 5 Reference test method Met
35、hod A is the reference test method (RTM), which is the one used to settle disputes. 6 Apparatus Annexes A and B include layout drawings and other equipment requirements for each of the methods A and B, respectively. 7 Sampling and specimens 7.1 Specimen length The specimen shall be a short length of
36、 fibre, or as specified in the detail specification. 7.2 Specimen end face Because the end faces of the specimen are not involved in the measurement itself, it is not necessary to have tight end-face requirements. 8 Procedure See annexes A and B for methods A and B, respectively. 9 Calculations See
37、annexes A and B for methods A and B, respectively. Page6 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 7 10 Results The following information shall be provided with each measurement: date and title of measurement; identification and description of specimen; measurement results as required by the d
38、etail specification. The following information shall be available upon request: length of specimen; measurement method used: A or B; description of measurement apparatus arrangement; details of computation technique; date and details of the latest calibration. 11 Specification information The detail
39、 specification shall specify the following information: type of fibre to be measured; failure or acceptance criteria; information to be reported; deviations to the procedure that apply. Page7 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 8 Annex A (normative) Requirements specific to method A Side
40、-view light distribution A.1 Apparatus The apparatus may consist of an optical microscope or a laser gauge. A.1.1 Optical microscope See figure A.1 for a schematic diagram of typical test equipment. A.1.1.1 Lens objective Use a high-quality microscope lens objective, with transmitted light illuminat
41、ion. A.1.1.2 Fibre holding arrangement Provide a fixture to hold the fibre in the focal plane of the microscope, with the fibre axis perpendicular to the optical axis of the objective. Immerse the specimen in a suitable index- matching fluid, and retain it by means of a cell made with a transparent
42、material. If necessary, fix this cell on a rotating table, in order to position the specimen parallel to the cursor. Hold the cell assembly as a whole, or the fibre within the cell, by the fibre clamp in such a way that it may be rotated through at least 180, and be capable of being fixed in a suffi
43、cient number of positions for the purpose of measuring coating dimensions. The mechanical tolerances should be such that minimal repositioning and refocusing is required when the fibre is moved from one rotational position to another. Microscope Rotating fibre clamp Rotating table (integral with fib
44、re under test and fibre clamp) Fibre under testWhite light source Index matching fluid IEC 581/01 Figure A1 Schematic diagram of typical test equipment Page8 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 9 A.1.1.3 Image viewing The image may be viewed directly using a filar eyepiece or projected o
45、nto a charge-coupled device (CCD) camera and displayed on a monitor. A typical system magnification for the visual method is 100 to 200, and for the camera method is typically 20; in the latter case the image is formed directly onto the CCD. Determine the dimensions of the fibre image by using the f
46、ilar eyepiece with the visual method and by positioning an electronic cursor on the monitor, or by computer data analysis of a stored image with the camera method. A.1.2 Laser gauge See figure A.2 for a schematic diagram of typical test equipment. A.1.2.1 General components The apparatus shall consi
47、st of a laser source operating at a suitable wavelength (e.g. 633 nm), a scanning device and a detector. If necessary, a system of lenses may be used to collimate the beam onto the specimen. A.1.2.2 Fibre holding arrangement Hold the specimen by means of a suitable rotating fibre clamp so that it is
48、 capable of rotating through at least 180 and being fixed in a sufficient number of positions while maintaining the fibre axis perpendicular to the optical axis of the apparatus. Scanning device Source Data acquisition Fibre under test Detector D 1 Lens Lens D 2 D 3 IEC 582/01 Figure A.2 Side view o
49、f measurement set-up Page9 EN60793121:2002 BSI17May200260793-1-21 IEC:2001 10 A.2 Procedure A.2.1 Calibration Calibrate the apparatus by measuring an object of known dimensions (calibration sample). However, since the accuracy of this test method is typically 1 m, the dimensions of the cali- bration specimen need only be known to within
