1、 TIA-455-72-1997 APPROVED: JULY 30, 1997 REAFFIRMED: DECEMBER 21, 2001 REAFFIRMED: FEBRUARY 6, 2013 TIA-455-72 October 1997FOTP- 72 Procedure for Assessing Temperature and Humidity Cycling Exposure Effects on Optical Characteristics of Optical Fibers NOTICE TIA Engineering Standards and Publications
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19、ON OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TlNEIA-455-72 FOTP-72 Procedure for assessing temperature and humidity cycling exposure effects on optical characteristics of optical fibers Contents F
20、oreword iii I introduction 1 2 Normative references. . .2 3 Apparatus 3 4 Sampling andspecimens 5 5 Procedure 6 6 Calculations or interpretation of results . 8 7 Documentation 9 8 Specification information . 1 O Annex A (informative) - Comparison between this FOTP and IEC or ITU requirements. 1 I I
21、TINEIA-455-72 FOTP-72 Procedure for assessing temperature and humidity cycling exposure effects on optical characteristics of optical fi bers Foreword (This Foreword is informative only and is not part of this Standard.) This document comes from TIA Standards Proposai No. 2817-B and was formulated u
22、nder the cognizance of F0-6.6, Subcommittee on Optical Fibers and Materiais. This FOTP is part of the series of test procedures included within Recommended Standard EINTiA-455. There is one annex and it is informative. Key words: cyclic exposure, optical characterization Previous page iii is blank S
23、TD-EIA TIA-455-72-ENGL 1977 W 3234b00 0591b21 2TT TINElA455-72 I Introduction 1.1 This test procedure describes a method for the determination, in an accelerated manner, of the effects of temperature and humidity cycling on the optical characteristics of optical fibers. It is intended to assess the
24、ability of an optical fiber to withstand cyclic changes in temperature and humidity in the surrounding atmosphere. The performance of the fiber during and after cycling may be evaluated by performing specific optical tests. 1.2 The specification of this procedure in conjunction with defined failure
25、criteria presupposes that the failure criteria selected to evaluate the property or properties being measured as a function of the cycling conditions and duration can be shown to relate to the intended use of the optical fiber. At the time this document was prepared, no proven model existed for the
26、prediction of the lifetime performance of fiber deployed in field applications using data generated through cyclic temperature and humidity testing. Optical fibers exposed to temperature and humidity cycling may be subject to many types of changes. The severity of the exposures in time, temperature,
27、 and humidity determines the type and extent of change. An optical property may not necessarily be degraded by such cyclic exposure, but may remain unchanged or even improve. A typical indication of damage resulting from such cycling is an excessive temporary or permanent change in an optical proper
28、ty, such as transmittance. The degree of change observed will depend on the specific property measured. Different properties may not change at the same rate, and the rate and direction of change may not be constant over time, temperature, and humidity. The effects of exposure may be quite variable,
29、especially when specimens are exposed for long time intervals. Reproducibility is affected by the temperature and humidity control tolerances, the duration of the exposure, and the aging characteristics of the fiber coating(s), among other factors. Errors in exposure conditions may have cumulative e
30、ffects over time. 1.3 This test is destructive; the fiber specimens are not expected to remain usable after completion of the test. 1 STDmEIA TIA-455-72-ENGL 1777 3239b00 0591b22 L3b b TINEIA-455-72 Warning: Care should be taken when handling small-diameter fiber to prevent it from puncturing the sk
31、in, especially in the eye area. Direct viewing of the end of an optical fiber or of an unterminated optical fiber component port is not recommended when it is propagating energy unless prior assurance has been obtained that the energy output level is safe. _ - 2 Normative References Test or inspecti
32、on requirements may include, but are not limited to, the following references: EIAlTIA-455-A FOTP-20 FOTP-46 FOTP-53 FOTP-57 FOTP-59 (TINE IA45 5-2 OA) (TINEIA-455-46A) (TINE IA-455-53A) (TINE IA-455-57B)2) (TlNEIA-455-59A) Standard test procedures for fiber optic fibersy cables, transducers, sensor
33、s, connecting and terminating devices, and other fiber optic components (August 7 99 7) Measurement of change in optical transmiffance Spectral attenuation measurements for long-lengthy graded index optical fibers (Ocfober 7990) Attenuation by substitution measurement for multimode graded index opti
34、cal fibers or fiber assemblies used in long-length communications systems (September 7990) Optical fiber end preparation and examination Measurement of fiber point discontinuities using an OTDR In process of preparation. Pending publication of this revision, use TIAiEIA-455-20. 2, In process of prep
35、aration. Pending publication of this revision, use TIAiEIA-455-57A. In process of preparation. Pending publication of this revision, use TINEIAQ55-59. 2 TINEIA-455-72 FOTP-61 (TIA/EIA-455-61A)4) OTDR measurement of fiber or cable attenuafion FOTP-78 (TINEIA-455-78A) Spectral attenuation cutback meas
36、urement for single- mode optical fibers (May 7990) Users of this FOTP are encouraged to specify the most recent edition of the FOTPs referenced above. In case of dispute, use the specified document revision. Caution: Do not make casually the decision to require the most recent edition of a reference
37、d FOTP. There have been instances when document revisions have completely changed the intent, application, use, etc. of a document such that the requirement to use an edition more recent than the one originally reviewed may be totally inappropriate. 3 Apparatus 3.1 Test chamber Use an environmental
38、chamber whose operational range covers the temperature and humidity ranges and rates of change specified by this document or by the Detail Specification. Unless otherwise specified in the Detail Specification, the chamber shall maintain any specified temperature to within I2 OC (I4 OF) and any speci
39、fied relative humidity (RH) to within 15% RH throughout the test duration. Unless otherwise specified, the chamber shall have the capacity to change the internal temperature at a rate of at least 25 “C (45 OF) per hour. The inside dimensions of the chamber shall be sufficient to accommodate the spec
40、imens with a free flow of air around them and to maintain the specified test conditions. The heat source shall be located so that radiant heat will not fall directly on the specimens. When possible, the chamber shall maintain the high-humidity environments required in 5.2.7 without Condensation; alt
41、ernatively, provision shall be made to position or protect the specimens to prevent condensation from dripping onto them during the test. If the applicable Detail Specification specifies in-situ optical measurement of the specimens, the chamber shall provide an access port 4) In process of preparati
42、on. Pending publication of this revision, use TINEIA-455-61. 3 TINEIA-455-72 or ports through which both ends of the specimens may extend. These ports shall have provision for sealing around any specimens that extend out of the chamber in such a way that the specified test conditions can be maintain
43、ed. It may be desirable to have a window in the door to observe the specimens during the test. If necessary because of the limitations of this test chamber, a separate chamber may be used for the portion of the test cycle that runs below room temperature. This chamber shall be capable of maintaining
44、 to within I2 OC (k4 OF) the lowest internal temperature required by the specified exposure schedule selected in 5.2.7, or as otherwise specified by the Detail Specification. Unless otherwise specified, this chamber shall have the capacity to change the internal temperature at a rate of at least 20
45、OC (36 OF) per hour. While in this chamber, the specimens shall also be protected from direct radiant heat and from condensation. Provision shall be made to transfer the specimens between the chambers within 15 minutes maximum, only when both chambers are at room ambient conditions, and with no dire
46、ct handling of the specimens themselves. The cycle timing shall include only those times when the chambers are at the specified temperatures and humidities; the transfer time shall not be included in the cycle time. If a second chamber is used, no in-situ measurements shall be attempted (in order to
47、 minimize handling and potential damage to the specimens), and specific information to that effect shall be reported with the results. 3.2 Temperature recording device Use a temperature recording device to provide a record of the temperature throughout the test. Unless otherwise specified, the recor
48、der and the sensor shall have a combined accuracy of within I2 “C (14 OF). The sensor shall be positioned to measure accurately the temperature experienced by the specimens. It may be desirable to use multiple sensors and a multi-channel recorder so that temperatures measured at several locations ar
49、ound the specimens can be recorded. 3.3 Relative humidity determination Determine relative humidity (RH) using the dry bulb-wet bulb thermometer coi;nparison or an equivalent method. Unless otherwise specified, the RH measurements shall be accurate to within the equivalent of *I “C (I2 OF) for the dry bulb-wet bulb method. The use of a recording device may be desirable to permit correlation between changes of state and events that occur during the test. When the wet bulb control method is used, clean the wet bulb thermocouple and replace the sock every 30 days or at the sta
