IEC 61757-2-2:2016(E) defines detail specifications for distributed temperature measurement by a fibre optic sensor, also known as fibre optic distributed temperature sensing (DTS). DTS includes the use of Raman scattering, Brillouin scattering and Rayleigh scattering effects. In addition, Raman scattering and Rayleigh scattering based measurements are performed with a single-ended fibre configuration only. Brillouin scattering based measurements are performed with a single-ended fibre or fibre loop configuration. The technique accessible from both sides at same time (e. g. Brillouin optical time domain analysis, BOTDA) is referred to here as a loop configuration. Generic specifications for fibre optic sensors are defined in IEC 61757-1:2012. This part of IEC 61757 specifies the most important DTS performance parameters and defines the procedures for their determination. In addition to the group of performance parameters, a list of additional parameters has been defined to support the definition of the measurement specifications and their associated test procedures. The definitions of these additional parameters are provided for informational purposes and should be included with the sets of performance parameters. A general test setup is defined in which all parameters can be gathered through a set of tests. The specific tests are described within the clause for each measurement parameter. This general test setup is depicted and described in Clause 4 along with a list of general information that should be documented based upon the specific DTS instrument and test setup used to measure these parameters as per IEC 61757-2-2. Annex A provides a blank performance parameter table which should be used to record the performance parameter values for a given DTS instrument and chosen optical test setup configuration. Annex B provides guidelines for optional determination of point defect effects. Keywords: fibre optic distributed temperature sensing (DTS) This publication is to be read in conjunction with \/2<\/p>\n
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| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figures Figure 1 \u2013 Example of a temperature trace with temperature sample points <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4 General test setups for measurement of performance parameters 4.1 General and test setup requirements <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Figure 2 \u2013 General test setup: single-ended Figure 3 \u2013 General test setup: loop configuration <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4.2 General required information to be documented <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5 Measurement procedures for performance parameters 5.1 Temperature measurement error 5.1.1 Test procedure and conditions 5.1.2 Parameter calculation <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 4 \u2013 Temperature measurement error calculation: step 1 <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 5.2 Spatial resolution 5.2.1 Test procedure and conditions Figure 5 \u2013 Temperature measurement error calculation: steps 2 through 3 Figure 6 \u2013 Temperature measurement error calculation: steps 4 through 5 <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 5.2.2 Parameter calculation 5.3 Temperature repeatability 5.3.1 Test procedure and conditions Figure 7 \u2013 Spatial resolution illustration <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 5.3.2 Parameter calculation Figure 8 \u2013 Temperature repeatability calculated from Figure 4 <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5.3.3 Formulas 5.4 Spatial temperature uncertainty 5.4.1 Test procedure and conditions 5.4.2 Parameter calculation <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 5.5 Environmental temperature stability 5.5.1 Test procedure and conditions Figure 9 \u2013 Spatial temperature uncertainty calculated from Figure 4 <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 5.5.2 Parameter calculation Figure 10 \u2013 Environmental temperature cycle (example for a DTS instrument with an operating temperature range of 0 \u00b0C to 40 \u00b0C) <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 5.6 Warm-up time 5.6.1 Test procedure and conditions Figure 11 \u2013 Environmental temperature stability parameter calculation method <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 5.6.2 Parameter calculation Figure 12 \u2013 Example illustrating calculation of warm-up time <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 5.7 Attenuation range 5.7.1 Test procedure and conditions <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 5.7.2 Parameter calculation <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex A (informative) Measurement parameter performance table Tables Table A.1 \u2013 Blank measurement parameter performance table <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex B (informative) Point defect effects B.1 General B.2 Point defect B.3 Test procedures and conditions <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure B.1 \u2013 Point defect measurement (example) <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Fibre optic sensors – Temperature measurement. Distributed sensing<\/b><\/p>\n |