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1、BRITISH STANDARD BS EN 60793-1-34: 2002 Optical fibres Part 1-34: Measurement methods and test procedures Fibre curl ICS 33.180.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy,
2、 (c) BSI BS EN 60793-1-34:2002 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 21 June 2002 BSI 21 June 2002 ISBN 0 580 39811 0 National f
3、oreword This British Standard is the official English language version of EN 60793-1-34:2002. It is identical with IEC 60793-1-34:2001. 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 th
4、e 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 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 t
5、he change over from one numbering 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 enti
6、tled “International Standards 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. Complia
7、nce with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related i
8、nternational 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, pages 2 to 13, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amen
9、dments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARDEN 60793-1-34 NORME EUROPENNE EUROPISCHE NORMFebruary 2002 CENELEC European Committee for Electrotechnical Standardization
10、 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 CENELEC members. Ref. No. EN 60793-1-34:2002 E ICS
11、 33.180.10 English version Optical fibres Part 1-34: Measurement methods and test procedures Fibre curl (IEC 60793-1-34:2001) Fibres optiques Partie 1-34: Mthodes de mesure et procdures dessai Ondulation (CEI 60793-1-34:2001) Lichtwellenleiter Teil 1-34: Messmethoden und Prfverfahren Faserringeln (I
12、EC 60793-1-34:2001) This European Standard was approved by CENELEC on 2001-10-01. 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
13、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 other language made by translation under the resp
14、onsibility of a CENELEC member into its own language and notified to the Central Secretariat has 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, It
15、aly, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of document 86A/668/FDIS, future edition 1 of IEC 60793-1-34, prepared by
16、 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 60793-1-34 on 2001-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical nation
17、al standard or by endorsement(dop)2002-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 2004-10-01 Annexes designated “informative“ are given for information only. In this standard, annex A is normative and annexes B and C are informative. Compared
18、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 published as “Part 2-XX“. The general relationship betwe
19、en the new series of EN 60793 and the superseded European Standards of the EN 188000 series is as follows: ENTitlesupersedes EN 60793-1-XXOptical fibres - Part 1-XX: Measurement methods and test procedures Individual subclauses of EN 188000:1992 EN 60793-2-XXOptical fibres - Part 2-XX: Product speci
20、ficationsEN 188100:1995 EN 188101:1995 EN 188102:1995 EN 188200:1995 EN 188201:1995 EN 188202:1995 EN 60793-1-3X consists of the following parts, under the general title: Optical fibres: - Part 1-30: Measurement methods and test procedures Fibre proof test - Part 1-31: Measurement methods and test p
21、rocedures Tensile strength - Part 1-32: Measurement methods and test procedures Coating strippability - Part 1-33: Measurement methods and test procedures Stress corrosion susceptibility - Part 1-34: Measurement methods and test procedures Fibre curl _ Endorsement notice The text of the Internationa
22、l Standard IEC 60793-1-34:2001 was approved by CENELEC as a European Standard without any modification. _ 2 egaP 2002:43139706 NE SB BSI 21 June 2002 Page 2 EN 60793134:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 067-39-134 ? CEI:02
23、10 3 CONTENTS INTRODUCTION.4 1Scope.5 2Normative references .5 3Apparatus.5 3.1Fibre holding fixture.6 3.2Fibre rotator 6 3.3End measurement device 6 3.4Computer (optional).6 4Sample preparation 6 5Procedure.6 5.1Mounting of the fibre .6 5.2Rotation 6 5.3Calculation 6 6Fibre curl calculations.6 7Res
24、ults.7 8Specification information 7 Annex A (normative) Fibre curl by side view microscopy8 Annex B (informative) Fibre curl by laser beam scattering11 Annex C (informative) Derivation of the circular fibre curl model 13 Figure A.1 Schematic diagram for apparatus to measure fibre curl using an optic
25、al microscope .9 Figure A.2 Schematic diagram for apparatus to measure fibre curl using a laser micrometer10 Figure A.3 Schematic diagram for apparatus to measure fibre curl while securing the sample in a ferrule10 Figure B.1 Schematic diagram of optical curl by laser beam scattering 12 3 egaP 2002:
26、43139706 NE SB BSI 21 June 2002 Page 3 EN 60793134:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 067-39-134 ? CEI:0210 4 INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures as they apply
27、 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 procedures for mechanical charac- teristics parts 1-40 t
28、o 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. 4 egaP 2002:43139706 NE SB BSI 21 June 2002 Page 4 EN 60793134:2002 Licensed Copy: sheffieldun sheffieldun, na
29、, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 067-39-134 ? CEI:0210 5 OPTICAL FIBRES Part 1-34: Measurement methods and test procedures Fibre curl 1 Scope This part of IEC 60793 establishes uniform requirements for the mechanical characteristic fibre curl or latent curvature, in u
30、ncoated optical fibres. Fibre curl has been identified as an important parameter for minimizing the splice loss of optical fibres when using passive alignment fusion splicers or active alignment mass fusion splicers. Two methods, presented in Annexes A and B respectively, are recognized for the meas
31、ure- ment of fibre curl, in uncoated optical fibres: ? method A: side view microscopy; ? method B: laser beam scattering. The side view microscopy procedure measures the radius of curvature of an uncoated fibre by determining the amount of deflection that occurs as an unsupported fibre end is rotate
32、d about the fibres axis. The laser beam scattering procedure measures fibre curl in an optical fibre by laser beam scattering. By knowing the maximum deflection of the fibre and the overhang distance from the fibre fixture to the measurement point, the fibres radius of curvature can be calculated fr
33、om a simple circular model, the derivation of which is given in annex C. Both methods are applicable to types A1, A2, A3 and B optical fibres. Method A is the reference test method, used to resolve disputes. 2 Normative references None. 3 Apparatus An uncoated fibre end is mounted in a rotatable fix
34、ture so that the end extends freely into space for a prescribed overhang distance, X. The fibre is rotated and the deviations in the position of the end from about a centre position are measured to obtain the maximum deflection distance, ?f. Details pertaining to the two methods are given in the rel
35、evant annex A or B. Common apparatus requirements are given below. 5 egaP 2002:43139706 NE SB BSI 21 June 2002 Page 5 EN 60793134:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 067-39-134 ? CEI:0210 6 3.1 Fibre holding fixture Provide
36、a fixture that holds the fibre on a constant axis at the holding position and allows the fibre to be rotated through 360?. The fixture may be a v-groove holder such as a vacuum chuck or a fibre ferrule. If a ferrule is used, take care to ensure that the inside diameter is sized closely enough to the
37、 fibre diameter to minimize variability in the deflection measurements. 3.2 Fibre rotator Provide a device to grip and rotate the fibre through 360?. The device may be manually operated, or may be driven by a rotational device such as a stepper motor. 3.3 End measurement device Provide an end measur
38、ement device according to either annex A or annex B. 3.4 Computer (optional) A computer may be used to provide motion control, data collection and computation. 4 Sample preparation Use an uncabled fibre of appropriate length for the instrument design. Remove enough coating from one end to allow moun
39、ting in the fibre fixture with the necessary overhang. 5 Procedure Details for each method are given in annexes A and B. Common procedures are described below. 5.1 Mounting of the fibre Mount the fibre in the holding fixture so that the stripped end extends into free space with sufficient overhang d
40、istance to appear in the end measurement device. Overhang distance of between 10 mm and 20 mm are typically used. Attach the other end of the fibre to the fibre rotator. 5.2 Rotation Rotate the fibre through 360? in increments of 10? to 20?. At each angular position, measure and record the deflectio
41、n of the free end, using the detailed procedure of annex A or annex B. 5.3 Calculation Complete the detailed calculation of annex A or annex B. 6 Fibre curl calculations Fibre curl is defined as radius of curvature, rc, which is defined as follows: rc = (X2 + ?2f)/2?f(1) 6 egaP 2002:43139706 NE SB B
42、SI 21 June 2002 Page 6 EN 60793134:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 067-39-134 ? CEI:0210 7 where Xis the overhang distance; ?fis the fibre deflection. NOTE Though deflection is typically scaled in micrometres, the radius
43、 of curvature value is typically re-scaled in units of metres. 7 Results 7.1 The following information should be reported for each test: date of the test; fibre identification; fibre radius of curvature. 7.2 The following information should be available for each test: method used to determine curl;
44、description of the equipment; calibration data. 8 Specification information The detail specification shall specify the following information: information to be reported; any deviations to the procedure that apply; failure or acceptance criteria. 7 egaP 2002:43139706 NE SB BSI 21 June 2002 Page 7 EN
45、60793134:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 03:52:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 067-39-134 ? CEI:0210 8 Annex A (normative) Fibre curl by side view microscopy This procedure measures the radius of curvature of an uncoated fibre by determining the amount of de
46、flection which occurs as an unsupported fibre end is rotated about the fibres axis. By knowing the maximum deflection of the fibre and the overhang distance from the fibre fixture to the measurement point, the fibres radius of curvature can be calculated from a simple circular model, the derivation
47、of which is given in annex C. A.1 Apparatus Schematic diagrams of typical test set-ups for these techniques are shown in figures A.1, A.2 and A.3. A.1.1 Deflection measurement device Provide a device to measure the fibre deflection as it is rotated through 360. Such a device may consist of a viewing
48、 microscope or an optical measuring instrument such as a laser micrometer. If a viewing microscope is used, provide means to permit accurate measurement of fibre deflection, such as a filar eyepiece or image analysis system. A.1.2 Video camera and monitor A video camera and monitor may be used to en
49、hance the viewing system for manual or automated operation. A.1.3 Analyzer A video analyzer may be used to provide more precise location of the measurement filar, if one is used. A.2 Test procedure Two techniques are provided for obtaining the deflection, ?f. The first is a direct technique that is limited by the precision with which the extremes of the individual deflections can be determined. The second is a fitting method. A.2.