ANSI TIA-455-31-C-1994 FOTP-31 Proof Testing Optical Fibers by Tension.pdf

1、 TIA-455-31-C (Revision of TIA-455-31-B) September 1994FOTP-31 Proof Testing Optical Fibers by Tension ANSI/TIA-455-31-C-1994 APPROVED: SEPTEMBER 21, 1994 REAFFIRMED: FEBRUARY 8, 1999 REAFFIRMED: MAY 10, 2005 REAFFIRMED: AUGUST 2, 2013 NOTICE TIA Engineering Standards and Publications are designed t

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19、 IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. 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 Requirem

20、ents . 4 3.2 Equipment Examples . 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 MA

21、CHINE SPEED AND TENSION LOAD 12 ANNEX B . COMPARISON BETWEEN THIS FOTP AND IEC OR CCITT REQUIREMENTS 15 ANNEX C . REFERENCES . 17 1 TIA5-31 C FOTP-31 PROOF TESTING OPTICAL FIBERS BY TENSION (From TIA Standards Proposal No. 3148, formulated under the cognizance of TIA FO-6.6, Subcommittee on Optical

22、Fibers and Materials.) This FOTP is part of the series of test procedures included within Recommended Standard ElMIA-455. NOTE - This FOTP was previously 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

23、 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 (all-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 p

24、arameter 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 fiber that survives proof testing. 2. APPLICABLE DOCUMENTS EIA/TIA-455-A, Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Sen

25、sors, Connecting and Terminating Devices, and Other Fiber Optic Components FOTP-76 (TIA/EIA-455-76), Method for Measurement of Dynamic Fatigue of Optical Fibers by Tension TSB-61 ,l) Power-Law Theory of Optical Fiber Reliability )To be published at a later date. 3 TINEIA-455-31 C 3. APPARATUS 3.1 Ge

26、neral 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 of debris in the

27、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 stress shall be ap

28、plied 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 shall not exceed the

29、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 cause variations in

30、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-test region, to n

31、ear-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 stresses imposed upo

32、n the test specimen by any guide surface. 4 TIN-455-31 C Accomplish this by ensuring that guide-surface radii are 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 tes

33、ting. 3.2 Equipment Examples The following examples illustrate some typical designs. Other designs may be used, 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).

34、 3.2.1 Braked-Capstan Type A specific apparatus illustrating the above requirements is shown in figure 1. 3.2.1.1 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

35、overloading. 3.2.1.2 Takeup The takeup is capable of spooling fiber so that a constant frictional contact with 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 d

36、rive capstan. A friction coating on the drums is used to prevent fiber slippage, without damaging the fiber coating. 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 eve

37、n and is kept constant throughout the test. 3.2.1.5 Drive The drive motor provides smooth motion over the desired range of speeds. Set-speed is held constant to maintain constant proof loading. 5 TINEIA-455-31 C VAR I AB LE MAGNETIC TORQUE LE3 GUIDE FIBER IN TEST PROOF- 7 -0 + I STEPPING MOTOR DRIVE

38、 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 TINEIA-455-31 C , 3.2.1.6 Fiber Guides Pulleys guide the fiber onto

39、the first drum and off the last drum. The top capstan drums are canted 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

40、subassembly pays out fiber from a reel under constant, near-zero, holdback 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 ten

41、sion to run straight and true to the proof-test region, with minimum 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

42、Pinch Belts These two belts are required to hold the fiber sample firmly 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

43、on a common shaft. (The second pulley is optional, however.) The fiber 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 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

44、U 3 (3 TINEIA-455-31 C 3.2.2.6 Load Arm The load arm is attached to the shaft of the dead-weight dancer pulley and down to the dead weight itself. The load arm is adjustable to zero balance. It is pivoted and actuates a sensor that signals the drive capstan either to increase or decrease speed, depe

45、nding 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. 3.2.2.7 Dead Weight At the bottom of the load arm is a thin plate. Weights, such as th

46、ose commonly used on bench beam scales, are added to the plate to produce the required actual proof load as determined by the subprocedure given in annex A. 3.2.2.8 Idler Pulley The idler pulley, which is optional, provides increased gauge length of the fiber under test. No idler pulley is required

47、if there is only one dancer pulley (see 3.2.2.5). 3.2.2.9 Takeup Capstan The takeup capstan is at the end of the proof-test region. This is driven and synchronized with the payout capstan so that tension fluctuations are minimized. 3.2.2.1 O Takeup Dancer Pulley The takeup dancer pulley produces the

48、 desired winding tension of the fiber on the takeup reel. (The winding tension is low in comparison to the proof test and shall not be a part of the Detail Specification requirement.) 3.2.2.1 1 Takeup Subassembly This traversing subassembly takes up the fiber on a reel for final shipping or for furt

49、her processing. It has various guide rollers and pulleys to ensure even laydown of the fiber, at the desired tension level, so that the fiber will remain on the reel without cascading . 4. SAMPLING AND SPECIMENS The test specimen shall consist of the entire length of optical fiber, minus a maximum of 25 m (82 ft) at each end. Fiber at each end of the test specimen may not necessarily be subjected to the full test load, and may have an unloading time greater than that required to meet A.2.1. 9 TINEIA-455-31 C The Detail Specification shall specify whether or not the untested portio