1、 IEC 61757-2-2 Edition 1.0 2016-05 INTERNATIONAL STANDARD Fibre optic sensors Part 2-2: Temperature measurement Distributed sensing IEC 61757-2-2:2016-05(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified,
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10、 to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 61757-2-2 Edition 1.0 2016-05 INTERNATIONAL STANDARD Fibre optic sensors Part 2-2: Temperature measurement Distributed sensing INTERNATIONAL ELECTROTECHNICAL COMMISSIO
11、N ICS 33.180.99 ISBN 978-2-8322-3363-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 61757-2-2:2016 IEC 2016 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative
12、references. 7 3 Terms and definitions 8 4 General test setups for measurement of performance parameters . 11 4.1 General and test setup requirements . 11 4.2 General required information to be documented . 13 5 Measurement procedures for performance parameters . 14 5.1 Temperature measurement error
13、. 14 5.1.1 Test procedure and conditions 14 5.1.2 Parameter calculation 14 5.2 Spatial resolution 16 5.2.1 Test procedure and conditions 16 5.2.2 Parameter calculation 17 5.3 Temperature repeatability 17 5.3.1 Test procedure and conditions 17 5.3.2 Parameter calculation 18 5.3.3 Formulas . 19 5.4 Sp
14、atial temperature uncertainty . 19 5.4.1 Test procedure and conditions 19 5.4.2 Parameter calculation 19 5.5 Environmental temperature stability . 20 5.5.1 Test procedure and conditions 20 5.5.2 Parameter calculation 21 5.6 Warm-up time . 22 5.6.1 Test procedure and conditions 22 5.6.2 Parameter cal
15、culation 23 5.7 Attenuation range 24 5.7.1 Test procedure and conditions 24 5.7.2 Parameter calculation 25 Annex A (informative) Measurement parameter performance table 26 Annex B (informative) Point defect effects . 28 B.1 General . 28 B.2 Point defect. 28 B.3 Test procedures and conditions . 28 Bi
16、bliography . 31 Figure 1 Example of a temperature trace with temperature sample points 10 Figure 2 General test setup: single-ended 12 Figure 3 General test setup: loop configuration . 12 Figure 4 Temperature measurement error calculation: step 1 15 Figure 5 Temperature measurement error calculation
17、: steps 2 through 3 . 16 Figure 6 Temperature measurement error calculation: steps 4 through 5 . 16 IEC 61757-2-2:2016 IEC 2016 3 Figure 7 Spatial resolution illustration . 17 Figure 8 Temperature repeatability calculated from Figure 4 . 18 Figure 9 Spatial temperature uncertainty calculated from Fi
18、gure 4 20 Figure 10 Environmental temperature cycle (example for a DTS instrument with an operating temperature range of 0 C to 40 C) . 21 Figure 11 Environmental temperature stability parameter calculation method 22 Figure 12 Example illustrating calculation of warm-up time 23 Figure B.1 Point defe
19、ct measurement (example) . 29 Table A.1 Blank measurement parameter performance table . 26 4 IEC 61757-2-2:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC SENSORS Part 2-2: Temperature measurement Distributed sensing FOREWORD 1) The International Electrotechnical Commission (IE
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29、 other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be
30、 the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61757-2-2 has been prepared by subcommittee SC 86C: Fibre optic systems and active devices of IEC technical committee 86: Fibre optics. The text of this standard
31、 is based on the following documents: CDV Report on voting 86C/1323/CDV 86C/1354/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2
32、. A list of all parts in the IEC 61757 series, published under the general title Fibre optic sensors, can be found on the IEC website. IEC 61757-2-2:2016 IEC 2016 5 This International Standard is to be used in conjunction with IEC 61757-1:2012. The committee has decided that the contents of this pub
33、lication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this pub
34、lication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 IEC
35、61757-2-2:2016 IEC 2016 INTRODUCTION It has been decided to restructure the IEC 61757 series with the following logic. From now on, the sub-parts will be renumbered as IEC 61757-M-T where M denotes the measure and T the technology. The existing part IEC 61757-1:2012 will be renumbered as IEC 61757 w
36、hen it will be revised and will serve as an umbrella document over the entire series. IEC 61757-2-2:2016 IEC 2016 7 FIBRE OPTIC SENSORS Part 2-2: Temperature measurement Distributed sensing 1 Scope This part of IEC 61757 defines detail specifications for distributed temperature measurement by a fibr
37、e 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 configurat
38、ion 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 f
39、ibre 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 d
40、efinition 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 gath
41、ered 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
42、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 poi
43、nt defect effects. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (
44、including any amendments) applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at http:/www.electropedia.org) IEC 61757-1:2012, Fibre optic sensors Part 1: Generic specification IEC TR 61931, Fibre optic Terminology ISO/IEC Guide 99, International vocabulary of metrol
45、ogy Basic and general concepts and associated terms (VIM) 8 IEC 61757-2-2:2016 IEC 2016 3 Terms and definitions For the purposes of this document, the definitions given in IEC 61757-1:2012, IEC 60050, IEC TR 61931, ISO/IEC Guide 99 (VIM), as well as the following apply. 3.1 attenuation range total c
46、umulated optical loss (one way loss) tolerated by the DTS system without affecting the specified measurement performance more than a given factor at a given location, spatial resolution, and measurement time Note 1 to entry: Part of the total cumulative loss can be the fibre attenuation, point defec
47、t losses introduced by components such as connectors, splices, kink in the fibre, attenuators. Note 2 to entry: The attenuation range is expressed in decibels (dB). 3.2 distance measurement range maximum distance from the DTS instrument output connector along the fibre optic sensor within which the
48、instrument measures a temperature with specified measurement performance under defined conditions Note 1 to entry: This supporting parameter is closely related to the attenuation range of the instrument. In test cases used to prove or verify the reported specifications, the total fibre length shall
49、be equal to or greater than the specified distance measurement range. Note 2 to entry: The distance measurement range is expressed in length units (m or km). 3.3 environmental temperature repeatability difference of the measured constant fibre optic sensor temperature at a specified instrument temperature (e. g. nominal operating temperature) before and after temperature cycling of the instrument across the entire instrument operating temperature range Note 1 to
