1、 TIA-455-225 September 2015FOTP-225 IEC-61745 End-Face Image Analysis Procedure for the Calibration of Optical Fibre Geometry Test Sets ANSI/TIA-455-225-2015 APPROVED: AUGUST 11, 2015 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misu
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23、NTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. IEC 61745 Ed1 adopted as ANSI/TIA-455-225 3 CONTENTS Page FOREWORD . 4 Clause 1 General . 6 1.1 Scope and object 6 1.2 Definitions . 6 1.3 Geometrical parameters of optical fibres . 9 1.4 Description of geometry test sets . 9 1.5 Calibra
24、tion standard requirements . 10 2 Calibration . 10 2.1 Introductory remark . 10 2.2 Rationale for calibration of geometry test sets . 10 2.3 Calibration procedure 11 2.4 Check calibration procedure 14 2.5 Spatial linearity . 14 2.6 Calibration of core/cladding concentricity error measurement . 14 2.
25、7 Calibration of non-circularity measurement 14 3 Evaluation of uncertainties . 15 3.1 Introductory remark . 15 3.2 Evaluation of uncertainty in test set calibration. 15 3.3 Evaluation of uncertainty in fibre measurement 17 3.4 Evaluation of uncertainty in chromium mask measurement 18 3.5 Summary 19
26、 4 Documentation. 19 4.1 Records 19 4.2 Certificate of calibration. 19 4.3 Sample calibration certificate . 21 Annex A (informative) Derivation of calibration factors 23 Annex B (informative) Worked examples for the determination of calibration factors . 26 Annex C (normative) Calculation of uncerta
27、inties 27 Annex D (informative) Worked examples for the determination of uncertainties . 30 Annex E (informative) Generation of working standards 32 Annex F (informative) Estimation of uncertainty in the measurement of core/cladding concentricity error . 33 Annex G (informative) Estimation of uncert
28、ainty in the measurement of non-circularity 36 Figure 1 Example of a calibration chain and the accumulation of uncertainties 22 Figure A.1 Representation of a grid calibration mask 24 Figure A.2 Representation of an annulus calibration mask 25 Figure A.3 Derivation of correction offset 25 IEC 61745
29、Ed1 adopted as ANSI/TIA-455-225 4 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ END-FACE IMAGE ANALYSIS PROCEDURE FOR THE CALIBRATION OF OPTICAL FIBRE GEOMETRY TEST SETS FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all natio
30、nal electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. T
31、heir preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collabor
32、ates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion
33、on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and t
34、hey are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional stand ards. Any divergence between the IEC S
35、tandard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn t
36、o the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all suc h patent rights. International Standard IEC 61745 has been prepared by IEC technical committee 86: Fibre optics. This b
37、ilingual version, published in 2001-03, corresponds to the English version. The text of this standard is based on the following documents: FDIS Report on voting 86/125/FDIS 86/134/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in t
38、he above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 3. Annex C forms an integral part of this standard. Annexes A, B, D, E, F and G are for information only. The committee has decided that the contents of this publication will remain unchanged until 2005
39、. At this date, the publication will be reconfirmed; IEC 61745 Ed1 adopted as ANSI/TIA-455-225 5 withdrawn; replaced by a revised edition, or amended. IEC 61745 Ed1 adopted as ANSI/TIA-455-225 6 END-FACE IMAGE ANALYSIS PROCEDURE FOR THE CALIBRATION OF OPTICAL FIBRE GEOMETRY TEST SETS 1 General 1.1 S
40、cope and object In the research and production environments there exists a range of test methods for characterizing the geometry of optical fibres. Furthermore, each test method may determine one or more of the many parameters required for complete geometrical characterization. This International St
41、andard describes the calibration of test sets which perform end-face image analysis, also known as near-field or grey-scale analysis. The principles, however, may be applied to test sets of a different type. This standard addresses the calibration of measurements made on single-mode fibres only; how
42、ever, this type of test set may also be used to measure the geometrical parameters of the cores of multimode fibres, but the evaluation of uncertainties associated with these measurements is beyond the scope of this standard. The procedures outlined are to be performed by calibration laboratories an
43、d by the manufacturers or users of geometry test sets, for the purpose of calibrating geometry test sets and for evaluating the uncertainties in measurements made on calibrated test sets. The calibration of fibre coating or cable measurement test sets is not covered by this standard. The object of t
44、his standard is to define a standard procedure for the calibration of test sets for measuring the glass geometry of optical fibres. 1.2 Definitions For the purpose of this International Standard, the following definitions apply. 1.3 1.2.1 accredited calibration laboratory calibration laboratory auth
45、orised by the appropriate National Standards laboratory to issue calibration certificates with a specified uncertainty, which demonstrate traceability to national standards 1.4 1.2.2 artefact any object that is measured on or used to calibrate a geometry test set. An artefact may be, for example, an
46、 optical fibre or a chromium-on-glass pattern 1.5 1.2.3 calibration process by which the relationship between the values indicated by the geometry test set under calibration and the known values of the calibration standard is established. The purpose of calibration is to bring all geometry test sets
47、 into substantial agreement with a national standards laboratory. This may be performed either by adjustment of the geometry test set or by documentation of a calibration factor(s) in a calibration certificate. The pertaining environment and instrument conditions at the time of calibration are usual
48、ly r ecorded. Calibration includes estimation of all uncertainties. IEC 61745 Ed1 adopted as ANSI/TIA-455-225 7 1.6 1.2.4 calibration chain chain of transfers from a national standard to the geometry test set through intermediate or working standards (see figure 1) 1.7 1.2.5 calibration checking est
49、ablishing that a geometry test set that has been previously calibrated but has reached its calibration due date remains within specified uncertainty limits. If the geometry test set has drifted outside these limits, then re-calibration is required. Otherwise, the re-checking period can be extended for a stated period. The test set may be checked using a working standard 1.8 1.2.6 calibration standard artefact that is calibrated against a reference standard and is used to calibrate test sets. The artefact may be a fibre or a chromium-on-glass pattern. Proper use
