1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationOptical fibres Part 1-30: Measurement methods and test procedures Fibre proof testBS EN 60793-1-30:2011National forewordThis British Standard is the UK implementation of EN 60793
2、-1-30:2011. It isidentical to IEC 60793-1-30:2010. It supersedes BS EN 60793-1-30:2002which is withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables.A list of organizations represented on this c
3、ommittee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 65855 6ICS 33.180.10Compliance with a British Standard cannot confer immunity fromlega
4、l obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 March 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60793-1-30:2011EUROPEAN STANDARD EN 60793-1-30 NORME EUROPENNE EUROPISCHE NORM Febr
5、uary 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means res
6、erved worldwide for CENELEC members. Ref. No. EN 60793-1-30:2011 E ICS 33.180.10 Supersedes EN 60793-1-30:2002English version Optical fibres - Part 1-30: Measurement methods and test procedures - Fibre proof test (IEC 60793-1-30:2010) Fibres optiques - Partie 1-30: Mthodes de mesure et procdures des
7、sai - Essais dpreuve (CEI 60793-1-30:2010) Lichtwellenleiter -Teil 1-30: Messmethoden und Prfverfahren - Nachweis von Fehlern in Fasern (IEC 60793-1-30:2010) This European Standard was approved by CENELEC on 2011-01-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations wh
8、ich 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 Secretariat or to any CENELEC member. This Europea
9、n 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 the official versions. CENELEC members are the
10、 national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia
11、, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60793-1-30:2011EN 60793-1-30:2011 - 2 - Foreword The text of document 86A/1288/CDV, future edition 2 of IEC 60793-1-30, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was
12、 approved by CENELEC as EN 60793-1-30 on 2011-01-02. This European Standard supersedes EN 60793-1-30:2002. The main technical change with respect to EN 60793-1-30:2002 is an improved description of the procedure. Attention is drawn to the possibility that some of the elements of this document may be
13、 the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. 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) 201
14、1-10-02 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-01-02 _ Endorsement notice The text of the International Standard IEC 60793-1-30:2010 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibl
15、iography, the following note has to be added for the standard indicated: IEC 60793-1 series NOTE Partially harmonized in EN 60793-1 series (partially modified). _ BS EN 60793-1-30:2011 2 60793-1-30 IEC:2010(E) CONTENTS INTRODUCTION.5 1 Scope.6 2 Normative references .6 3 Apparatus.6 3.1 General .6 3
16、.2 Fibre pay out .6 3.3 Proof test region6 3.4 Fibre take-up.7 3.5 Load and unload7 3.6 Minimum bending radii 7 3.7 Typical equipment design7 3.7.1 Introduction .7 3.7.2 Braked capstan type7 3.7.3 Dead weight type.8 4 Sample preparation 9 5 Procedure 9 6 Calculations Compensation for load-sharing by
17、 coating .10 7 Results.10 7.1 Test requirement .10 7.2 Information to be provided.10 7.3 Optional information 11 8 Specification information 11 Bibliography12 Figure 1 Braked capstan type 8 Figure 2 Dead weight type .8 BS EN 60793-1-30:201160793-1-30 IEC:2010(E) 5 INTRODUCTION Publications in the IE
18、C 60793-1 series concern measurement methods and test procedures as they apply to optical fibres. Within the same series, several different areas are grouped, but all numbers possibly not used, as follows: parts 1-10 to 1-19: General parts 1-20 to 1-29: Measurement methods and test procedures for di
19、mensions parts 1-30 to 1-39: Measurement methods and test procedures 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 B
20、S EN 60793-1-30:2011 6 60793-1-30 IEC:2010(E) OPTICAL FIBRES Part 1-30: Measurement methods and test procedures Fibre proof test 1 Scope This part of IEC 60793 describes procedures for briefly applying a specified tensile load as a proof test to continuous lengths of optical fibre. The tensile load
21、is applied for as short a time as possible, yet sufficiently long to ensure the glass experiences the proof stress, typically much less than one second. This method is applicable to types A1, A2, A3 and B optical fibres. The object of this standard is to establish uniform requirements for the mechan
22、ical characteristic fibre proof test. 2 Normative references None. 3 Apparatus 3.1 General There are several possible machine designs, all of which perform the basic functions required for measuring fibre proof with the indicated general operating requirements. Care should be used in the design so a
23、s to prevent coating damage. Two machine types are used: braked capstan type; dead weight type. Either machine may be used during the fibre-drawing process (on-line for coated fibre only), or as a separate process step (off-line). NOTE There are dynamics with on-line screening, (different from off-l
24、ine screening), which should be taken into account. 3.2 Fibre pay out Isolate the tensile load variations from the proof test region so as not to cause variations in the proof load. Do not permit the applied proof stress to fluctuate below the value specified in the detail specification. 3.3 Proof t
25、est region With the exception of additional bend stress of up to 10 % of the proof stress, apply the proof stress uniformly through the cross-sectional area of the test sample. Ensure that the load-bearing members in this region are rigid (e. g. made of steel or aluminium). During testing, the tensi
26、on-producing mechanism(s) shall not allow the proof stress to fluctuate below the value specified in the detail specification. BS EN 60793-1-30:201160793-1-30 IEC:2010(E) 7 Proof testing requires that a constant stress be applied sequentially along the full length of fibre. A break rate (failures pe
27、r unit length) is statistically expected. It is carried out during fibre manufacturing, on-line as part of the fibre drawing and coating process, or off-line as part of the testing process. The stress history of proof test stressing is as follows: stress loading from near-zero to the proof test stre
28、ss during a load time; constant proof test stress during a dwell time; stress unloading from the proof test stress back down to near-zero during an unload time. 3.4 Fibre take-up Isolate the tensile load variations from the proof test region so as not to cause variations in the proof load. Ensure th
29、at the applied proof stress does not fluctuate below the value specified in the detail specification. 3.5 Load and unload The load and unload regions occur on both sides of the proof test region. Tension in the fibre ramps up from being under constant low tension, in the pay-out region, to the full
30、load in the proof test region. Tension in the fibre then ramps down, from the proof test region, to a constant low tension in the take-up region. The unload zone is the arc formed by the two tangent points in the guide where the fibre finally leaves the loading area. (For example, unloading across 9
31、0 of a 150 mm diameter wheel at a speed of about 12 m/s yields an unloading time of about 10 ms.) Control the unload time to some maximum, agreed between user and manufacturer. Accomplish ramping up and ramping down as quickly as possible. 3.6 Minimum bending radii All radii over which the test samp
32、le passes need to be of sufficient size so that the maximum stress and time at that stress shall not significantly degrade the strength of the sample. 3.7 Typical equipment design 3.7.1 Introduction The following examples illustrate some typical designs. Other designs may be used, provided the opera
33、ting requirements in 3.2 to 3.6 are met. 3.7.2 Braked capstan type A specific apparatus illustrating these requirements is shown in Figure 1. The fibre is paid out with constant low tension. The rewinding after the proof test is also done with constant tension. The levels of the pay-off and take-up
34、tensions are adjustable. The proof test load is applied to the fibre between the brake and drive capstans by creating a speed difference between the capstans. Two belts are used to prevent slippage at the capstans. One design can be that the high precision tension gauge measures the load on the fibr
35、e and controls the speed difference to achieve the required proof test load. The load level and operating speed of the equipment can be independently set. Another design can be that the difference in speeds between the two capstans is set and controlled directly according to the desired fibre elonga
36、tion (strain), without tension measurements. NOTE The relationship between stress and strain can be found in IEC/TR 62048 (see Bibliography). BS EN 60793-1-30:2011 8 60793-1-30 IEC:2010(E) Precision tension gauge Brake capstan Drive capstan DancerDancer Fibre in proof test zoneIEC 891/10 Fibre pay-o
37、ff region Stage 1: Constant pay-off Proof testing region Stage 2: Proof testing with master and braking capstan and precision tension gauge Fibre take-up region Stage 3: Constant tension take-up spooling Figure 1 Braked capstan type 3.7.3 Dead weight type Another specific apparatus illustrating thes
38、e requirements is shown in Figure 2. Pay out subassembly Pay out dancer pulley Dead weight (holder) Load arm Dead weight dancer pulleyPay out capstan Capstan pinch beltsTake up subassembly Take up capstanIdler pulley Take up dancer pulleyIEC 892/10 Figure 2 Dead weight type BS EN 60793-1-30:20116079
39、3-1-30 IEC:2010(E) 9 This sub-assembly pays out fibre from a reel under constant low tension. The pay-out sub-assembly has various guide rollers and pulleys, plus a motorised traversing mechanism. The pay-out dancer pulley keeps the sample under just enough tension to run straight and true to the pr
40、oof test region, with minimum tension fluctuations. The pay-out capstan is the start of the proof test region. This capstan is driven and synchronized with the take-up capstan. Two belts are required to hold the fibre sample firmly against the pay-out and take-up capstans so that there is no slippag
41、e at the entrance to, and exit from, the proof test region. The dancer pulley may consist of two pulleys, one behind the other on a common shaft. (The second pulley is optional, however.) The fibre is fed first to the rear pulley, then back up to the idler pulley, back down to the front dancer pulle
42、y and up to the take-up capstan. The load arm is attached to both the shaft of the dead weight dancer pulley and to the dead weight itself. The load arm is adjustable to zero balance. It is pivoted and actuates a sensor which signals the drive capstan either to increase or decrease speed, depending
43、on the position of the load arm. Since both drives are controlled from a common reference, load arm movement is negligible because the arm seeks a neutral position when the machine is at any operating speed. There is a thin plate at the bottom of the load arm. Weights are added to the plate to produ
44、ce the required actual proof load. The idler pulley, which is optional, provides increased gauge length of the fibre under test. No idler pulley is required if there is only one dancer pulley. The take-up capstan is at the end of the proof test region. This is driven and synchronized with the pay-ou
45、t capstan so that tension fluctuations are minimized. The take-up dancer pulley produces the desired winding tension of the fibre on the take-up reel. (The winding tension is low in comparison to the proof test and is not part of the detail specification requirement.) The take-up sub-assembly takes
46、up the fibre on a reel for final shipping or for further processing. It has various guide rollers and pulleys to ensure even lay-down of the fibre, at the desired tension level, so that the fibre remains on the reel without cascading. 4 Sample preparation Use the entire length of optical fibre as th
47、e test specimen, minus short sections, typically 25 m to 50 m at the ends (end allowance length). This allowance is required for a period of acceleration during which the unloading time exceeds the maximum. 5 Procedure The test specimen is fed into the machine according to the operating instructions
48、 for the machine. The tension load on the machine is set according to the requirements in the detail specification. The procedure allows easy detection of any failure in the fibre by the operator, if or when it occurs. The test specimen is run through the proof test machine. BS EN 60793-1-30:2011 10
49、 60793-1-30 IEC:2010(E) 6 Calculations Compensation for load-sharing by coating Calculate the fraction, F, of the tension carried by the protective coating as follows: 2gg2g211212222g21121222)()()()(DEDDEDDEDDEDDEF+= where Egis Youngs modulus of the glass fibre in Pa; E2is Youngs modulus of the second coating layer in Pa; E1is Youngs modulus of the first coating layer in Pa; Dgis the nominal diameter of the glass fibre in m; D2is the nominal
