BS EN 61745:2017
$189.07
End-face image analysis procedure for the calibration of optical fibre geometry test sets – Part 1: Introduction and roadmap for standardization
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 46 |
This document describes the calibration of test sets that perform end-face image analysis, also known as “near-field” or “grey-scale” analysis. The principles, however, can be applied to test sets of a different type.
The procedures outlined are performed by calibration laboratories and 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 document.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | English CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 14 | 4 General information and preparation for calibration 4.1 Geometrical parameters of optical fibres 4.2 Description of geometry test sets |
| 15 | 4.3 Calibration standard requirements 5 Calibration 5.1 General 5.2 Rationale for calibration of geometry test sets 5.2.1 General |
| 16 | 5.2.2 Verification of calibration state Figures Figure 1 – Example of a calibration chain and the accumulation of uncertainties |
| 17 | 5.3 Calibration procedure 5.3.1 General advice and organization 5.3.2 Test requirements 5.3.3 Calibration standard requirements 5.3.4 Determination of calibration factors |
| 19 | 5.4 Check calibration procedure 5.5 Spatial linearity |
| 20 | 5.6 Calibration of core/cladding concentricity error measurement 5.7 Calibration of non-circularity measurement 6 Evaluation of uncertainties 6.1 General |
| 21 | 6.2 Evaluation of uncertainty in test set calibration 6.2.1 General 6.2.2 Uncertainty in scaling factor |
| 22 | 6.2.3 Uncertainty in offset correction factor |
| 23 | 6.3 Evaluation of uncertainty in fibre measurement 6.3.1 General |
| 24 | 6.3.2 Determination of uOp,I,F 6.3.3 Determination of u’I,F 6.4 Evaluation of uncertainty in chromium mask measurement 6.4.1 General 6.4.2 Determination of uOp,I,C 6.4.3 Determination of u’I,C |
| 25 | 6.5 Summary 7 Documentation 7.1 Records |
| 26 | Annex A (normative)Mathematical basis for measurement uncertainty calculations A.1 General A.2 Type A evaluation of uncertainty A.3 Type B evaluation of uncertainty |
| 27 | A.4 Determining the combined standard uncertainty |
| 28 | A.5 Reporting |
| 29 | Annex B (informative)Derivation of calibration factors B.1 Derivation of scaling factors Figure B.1 – Representation of a grid calibration mask |
| 30 | B.2 Derivation of correction offset factor Figure B.2 – Representation of an annulus calibration mask |
| 31 | Figure B.3 – Derivation of correction offset |
| 32 | Annex C (informative)Examples for the determination of calibration factors C.1 Example of determination of scaling factor C.2 Example of determination of offset correction factor |
| 33 | Annex D (informative)Calculation of uncertainties D.1 General D.1.1 Overview D.1.2 Examples of type B evaluation of uncertainty D.2 Combining sources of uncertainty D.2.1 General |
| 34 | D.2.2 Example of combining several sources of uncertainty D.3 Student’s t distribution |
| 35 | Table D.1 – Values of t for specified confidence level |
| 36 | Annex E (informative)Worked examples for the determination of uncertainties E.1 General E.2 Example of determination of scaling factor uncertainty E.3 Example of determination of correction offset uncertainty |
| 37 | E.4 Example of determination of fibre measurement uncertainty E.5 Example of determination of chromium mask measurement uncertainty |
| 38 | Annex F (informative)Generation of working standards F.1 Generation of working standards F.1.1 General F.1.2 Measurement conditions F.2 Procedure for generation of working standards F.2.1 In the case where the infant artefact is a fibre F.2.2 In the case where the infant artefact is a chromium-on-glass artefact |
| 39 | Annex G (informative)Estimation of uncertainty in the measurementof core/cladding concentricity error G.1 Method of estimating uncertainty in concentricity error measurement G.1.1 General G.1.2 Determination of u G.1.3 Determination of uOP G.1.4 Determination of CB |
| 40 | Table G.1 – Measured values for angular positions |
| 41 | G.1.5 Determination of uCB G.2 Correcting for concentricity bias |
| 42 | Annex H (informative)Estimation of uncertainty in the measurement of non-circularity H.1 Method of estimating uncertainty in non-circularity measurement H.2 Determination of u H.3 Determination of uOp H.4 Determination of NCB H.4.1 General |
| 43 | H.4.2 Method A: uncalibrated artefact H.4.3 Method B: calibrated artefact H.5 Determination of uNCB |
| 44 | Bibliography |
Related products
-
BS EN 61745:2017
End-face image analysis procedure for the calibration of optical fibre geometry test sets – Part…
