1、BRITISH STANDARD Optical fibres Part 1-2 1 : Measurement methods and test procedures - Coating geometry The European Standard EN 60793-1-21:2002 has the status ofa British Standard ICs 33.180.10 BS EN 60793- 1-2 1 2002 BS EN 60793-1-21 12002 Amd.No. National foreword Date Comments This British Stand
2、ard, 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 This British Standard is the official English language version of EN 60793-1-21:2002. It is iden
3、tical with IEC 60793-1-21:2001. The UKparticipation 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: - - aid enquirers to understand the text; present to the responsible European commit
4、tee 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. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1
5、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 oftime during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The
6、 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 Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A B
7、ritish 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 Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a fr
8、ont 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. O BSI 17 May 2002 ISBN O 580 39616 9 EUROPEAN STANDARD EN 60793-1 -21 NORME EUROPENNE EUROPISCHE NORM March 2002 ICs 3
9、3.180.10 English version Optical fibres Part 1-21 : Measurement methods and test procedures - Coating geometry (IEC 60793-1 -21 12001) Fibres optiques Partie 1-21 : Mthodes de mesures et procdures dessai - Gomtrie du revtement (CE1 60793-1-21 12001) L ic h twe I le n le i ter Teil 1-21 : Messmethode
10、n und Prfverfahren - Besch ichtu ngsgeometrie (IEC 60793-1-21 12001) This European Standard was approved by CENELEC on 2002-03-05. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national st
11、andard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any o
12、ther 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 the oficial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland
13、, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnisch
14、e Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels O 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 Page 2 EN 60793-1-212002 EN EN 60793-1-XX Foreword Title su pers edes Optical fibres - P
15、art 1-XX: Measurement methods and test Drocedures EN 188000:1992 Individual subclauses of The text 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 CENEL
16、EC as EN 60793-1-21 on 2002-03-05. EN 60793-2-XX 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 - latest date by which the national standards conflicting with the EN have to be w
17、ithdrawn Optical fibres - Part 2-XX: Product specifications EN 188100:1995 EN 188101:1995 EN 188102:1995 EN 1 88200: 1995 EN 188201:1995 EN 1 88202: 1995 (dop) 2002-12-01 (dow) 2005-03-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annexes A, B and ZA are n
18、ormative. 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 “Part 1-XX“; the product standards are p
19、ublished 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 do rsemen t not i ce The text of the International Standard IEC 60793-1-21 :2001 was approved by CENELEC as a European Standard without
20、 any modification. O BSI 17 May 2002 Page 3 EN 60793- 1-21 2002 CONTENTS INTRODUCTION . 4 1 Scope 5 2 Normative references . . 5 3 Overview of method . 4 Definitions 5 Reference test method 6 6 Apparatus . 6 7 Sampling and specimens . 8 Procedure 9 Calculations 6 10 Results . 7 11 Specification info
21、rmation . 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 corresponding European publications
22、. 15 Bibliography 14 Figure AI - Schematic diagram of typical test equipment 8 Figure A.2 - Side view of measurement set-up 9 Figure BI - Top view of a typical electronic micrometer system . 12 Table 1 - Measurement methods 5 O BSI 17 May 2002 Page 4 EN 60793-1-212002 INTRODUCTION Publications in th
23、e 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: parts 1-20 to 1-29: parts 1-30 to 1-39: parts 1-40 to 1-49: parts 1-50 to 1-59: General Measurement method
24、s and test procedures for dimensions Measurement methods and test procedures for mechanical charac- ter ist ics Measurement methods and test procedures for transmission and optical characteristics Measurement methods and test procedures for environmental charac- teristics. O BSI 17 May 2002 Page 5 E
25、N 60793- 1-21 2002 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 fundamental values that need to be known fo
26、r 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 cited applies. For undated referen
27、ces, the latest edition of the referenced document (including any amendments) applies. IEC 60793-1-20, Opfical fibres - Parf 1-20: Measuremenf mefhods and fesf procedures - Fibre geomefry 3 Overview of method This standard gives four methods for measuring fibre geometry characteristics which are giv
28、en in terms of the following parameters: coating diameter; coating non-circularity; coating-cladding concentricity error. Table 1 - Measurement methods Method C h aracteris t i cs cove red Fibre category(ies) covered Former designation I A Side-view a I All All b I IEC 60793-I-A3 I I I B Mechanical
29、I Coating diameter and non-circularity I All I IEC 60793-I-A4 I 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 alternati
30、ve 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 suitable
31、for on-line, in-process measurements. Information common to both measurements appears in clauses 2 to IO. See also annexes A and B, for methods A and B, respectively. O BSI 17 May 2002 Page 6 EN 60793-1-212002 4 Definitions For the purpose of this part of IEC 60793, the following definitions apply.
32、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 pm protective coating) 4.2 secondary or “buffer“ coating one or mor
33、e 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 pm “buffer“ coating, “tight jacket“ or “ribbon coating“) 5 Reference test method Method A is the r
34、eference 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 fibre, or as
35、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 annexes A and
36、B for methods A and B, respectively. O BSI 17 May 2002 Page 7 EN 60793- 1-21 2002 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 detail specification
37、 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 specifica
38、tion 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. O BSI 17 May 2002 Page 8 EN 60793-1-212002 Annex A (norm at ive) Requirements specific to method A - Side-view I i g
39、 h t di st ri bu ti on A. 1 Apparatus The apparatus may consist of an optical microscope or a laser gauge. A.l.l Optical microscope See figure A.l for a schematic diagram of typical test equipment. A.l.l.l Lens objective Use a high-quality microscope lens objective, with transmitted light illuminati
40、on. 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 m
41、aterial. 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 suffic
42、ient 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 1 Rotating fibre clamp Index matching fluid /- . / -
43、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fibre under test “ Rotating table (integral with fibre under test and fibre clamp) / O / White light source IEC 587/07 Figure AI - Schematic diagram of typical test equipment O BSI 17 May 2002 Page 9 EN 60793- 1-21 2002 A.1.1.3 Image vi
44、ewing The image may be viewed directly using a filar eyepiece or projected onto a charge-coupled device (CCD) camera and displayed on a monitor. A typical system magnification for the visual method is x100 to x200, and for the camera method is typically x20; in the latter case the image is formed di
45、rectly onto the CCD. Determine the dimensions of the fibre image by using the filar 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
46、of typical test equipment. A.1.2.1 General components The apparatus shall consist 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 arrangem
47、ent Hold the specimen by means of a suitable rotating fibre clamp so that it is 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. DI Lens n Source Lens v Detector Fibre un
48、der test - Data acquisition IEC 58201 Figure A.2 - Side view of measurement Set-up O BSI 17 May 2002 Page 10 EN 60793-1-212002 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 t
49、ypically 1 ym, the dimensions of the cali- bration specimen need only be known to within an accuracy of 0,5 ym or better. A.2.2 Analyzing the image Determine the dimensions of the coating(s) under different rotation angles by the analysis of the image of the fibre. Using the laser gauge, the dimensions may be measured by evaluating the deflection function of the laser beam across the fibre. A.2.3 Analyzing the data After data acquisition, two different approaches may be followed: plane analysis or ellipse- fitting analysis. Proceed with the analysis only whe
