1、 TIA STANDARD FOTP-31 Proof Testing Optical Fibers by Tension TIA-455-31-C (Revision of TIA/EIA-31-B) September 1994 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Industries Alliance ANSI/TIA/EIA-455-31-C-1994Approved: Septemb
2、er 21, 1994Reaffirmed: February 8, 1999Reaffirmed: May 10, 2005Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE TIA Engineering Standards and Publications are designed to
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7、ty of regulatory limitations before its use. (From Standards Proposal No. 3-4420-RF2, formulated under the cognizance of the TIAFO-4.2 Subcommittee on Optical Fibers and Cables). Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arlington,
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21、by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIN-455-31 C FOTP-31 PROOF TESTING OPTICAL FIBERS BY TENSION CONTENTS 1 . INTRODUCTION 3 2 . APPLICABLE DOCUMENTS . 3 3 . APPARATUS 4 3.1 General Operating Requirements . 4 3.2 Equipment E
22、xamples . 5 4 . SAMPLING AND SPECIMENS 9 5 . PROCEDURE 10 6 . CALCULATIONS OR INTERPRETATION OF RESULTS . 10 . 7 . DOCUMENTATION 10 8 . SPECIFICATION INFORMATION . 11 FIGURE 1 . BRAKED-CAPSTAN TYPE 6 FIGURE 2 . DEAD-WEIGHT TYPE : . 8 ANNEX A . SUBPROCEDURE FOR ESTABLISHING MACHINE SPEED AND TENSION
23、LOAD 12 ANNEX B . COMPARISON BETWEEN THIS FOTP AND IEC OR CCITT REQUIREMENTS 15 ANNEX C . REFERENCES . 17 1 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA5-31 C FOTP-31 PRO
24、OF TESTING OPTICAL FIBERS BY TENSION (From TIA Standards Proposal No. 3148, formulated under the cognizance of TIA FO-6.6, Subcommittee on Optical Fibers and Materials.) This FOTP is part of the series of test procedures included within Recommended Standard ElMIA-455. NOTE - This FOTP was previously
25、 published in ElMIA-455-31 B as FOTP-31. 1. INTRODUCTION 1.1 This test method describes procedures for briefly applying a specified tensile load to continuous lengths of all Class I and Class IV, glass/giass optical fibers. This FOTP should not be applied to Class II (glass/plastic) and Class III (a
26、ll-plastic) fibers. 1.2 This method is intended to ensure a minimum strength for fiber that survives proof testing. The minimum strength is a key parameter for determining the minimum survival time at loads less than the minimum strength. 1.3 This method is intended to ensure a minimum strength for
27、fiber that survives proof testing. 2. APPLICABLE DOCUMENTS EIA/TIA-455-A, Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components FOTP-76 (TIA/EIA-455-76), Method for Measurement of Dynamic Fatigue of Optical
28、 Fibers by Tension TSB-61 ,l) Power-Law Theory of Optical Fiber Reliability )To be published at a later date. 3 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINEIA-455-31 C 3
29、. APPARATUS 3.1 General Operating Requirements There are several possible machine designs, all of which perform the following basic functions with the indicated general operating requirements. Take care in the design so as to prevent coating damage by either excessive proof stress or the possibility
30、 of debris in the proof-test region. 3.1.1 Fiber Payout Tensile-load variations shall be isolated from the proof-test region so as not to cause variations in the proof load. See 3.1.2.2. 3.1.2 Proof-Test Region With the exception of additional bend stress of up to 10% of the proof stress, the proof
31、stress shall be applied uniformly through the cross-sectional area of the test sample. The load-bearing members in this region shall be substantially noncompliant (e. g., made of steel). 3.1.2.1 The length of, and the linear velocity in, the unload region shall be such that the fiber unload time sha
32、ll not exceed the value determined in A.2.1. 3.1.2.2 The tension-producing mechanism(s) shall be such that, during testing, the proof stress does not fluctuate below the value determined in A.2.1. 3.1.3 Fiber Takeup Tensile-load variations shall be isolated from the proof-test region so as not to ca
33、use variations in the proof load. See 3.1.2.2. 3.1.4 Load and Unload Regions These regions occur on both sides of the proof-test region. Tension in the fiber ramps up from near-zero, in the payout region, to the full load in the proof-test region. Tension in the fiber then ramps down, from the proof
34、-test region, to near-zero in the takeup region. Ramping up and ramping down shall be accomplished as linearly as possible, and within the unload time requirements of A.2.1. 3.1.5 Minimum Bending Radii Ensure that the minimum fiber strength after proof testing is not degraded by excessive bending st
35、resses imposed upon the test specimen by any guide surface. 4 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIN-455-31 C Accomplish this by ensuring that guide-surface radii a
36、re large enough that the maximum stress at the fiber surface due to bending, in combination with the loading and unloading times, maintain the ensured minimum fiber strength after proof testing. 3.2 Equipment Examples The following examples illustrate some typical designs. Other designs may be used,
37、 provided the operating requirements in 3.1 are met. Either machine may be used during the fiber-drawing process (on-line - for coated fiber only), or as a separate process step (off-line). 3.2.1 Braked-Capstan Type A specific apparatus illustrating the above requirements is shown in figure 1. 3.2.1
38、.1 Payout The fiber sample is payed out under constant tension; otherwise, tension variations in payout may be superimposed on the proof-test load, causing loading variations and momentary overloading. 3.2.1.2 Takeup The takeup is capable of spooling fiber so that a constant frictional contact with
39、the capstan drums is maintained. Note that the fiber is able to be spooled at low tension. 3.2.1.3 Proof Tester The proof tester is made of two dual-canted capstans: a brake capstan and a drive capstan. A friction coating on the drums is used to prevent fiber slippage, without damaging the fiber coa
40、ting. The top and bottom drums of each pair are mechanically synchronized. 3.2.1.4 Brake The proof load is applied by braking the first set of capstans. The braking action is smooth and even and is kept constant throughout the test. 3.2.1.5 Drive The drive motor provides smooth motion over the desir
41、ed range of speeds. Set-speed is held constant to maintain constant proof loading. 5 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINEIA-455-31 C VAR I AB LE MAGNETIC TORQUE
42、LE3 GUIDE FIBER IN TEST PROOF- 7 -0 + I STEPPING MOTOR DRIVE ADJUSTABLE TORQUE MOTOR GUIDE STAGEI muxll STAGEII STAGEIV Cons tant- Fiber is Fiber is Spooling tension brought up brought down mechanism payout to the proof from the test stress proof test stress FIGURE 1 0 BRAKED-CAPSTAN TYPE 6 Copyrigh
43、t Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINEIA-455-31 C , 3.2.1.6 Fiber Guides Pulleys guide the fiber onto the first drum and off the last drum. The top capstan drums are cante
44、d slightly so that the fiber does not rub against itself as it returns to the bottom drum. 3.2.2 Dead-Weight Type Another specific apparatus illustrating the above requirements is shown in figure 2. 3.2.2.1 Payout Subassembly This subassembly pays out fiber from a reel under constant, near-zero, hol
45、dback tension. The payout subassembly has various guide rollers and pulleys, plus a motorized traversing mechanism. 3.2.2.2 Payout Dancer Pulley The payout dancer pulley is light in weight and keeps the sample under just enough tension to run straight and true to the proof-test region, with minimum
46、tension fluctuations. 3.2.2.3 Payout Capstan The payout capstan is the start of the proof-test region. This capstan is driven and synchronized with the takeup capstan. It also performs the length-metering function. 3.2.2.4 Capstan Pinch Belts These two belts are required to hold the fiber sample fir
47、mly against the payout and takeup capstans so that there is no slippage at the entrance to, and exit from, the proof-test region. 3.2.2.5 Dead-Weight Dancer Pulley The dancer pulley may consist of two pulleys, one behind the other on a common shaft. (The second pulley is optional, however.) The fibe
48、r is fed first to the rear pulley, then back up to the idler pulley (see 3.2.2.8), back down to the front dancer pulley and up to the takeup capstan. 7 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted withou
49、t license from IHS-,-,-TINEIA-455-31 C p. w Y u3 W m 3 I u a Z z s p. U I E 4 W E z t- I (3 d a l N w U 3 (3 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINEIA-455-31 C 3.2.2.6 Load Arm The load arm is attached to the shaft of the dead-w
