SIST EN IEC 61757-1:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.LWL-Sensoren - Teil 1: Fachgrundspezifikation (IEC 61757:2018)Capteurs a fibres optiques - Partie 1: Spécification générique (IEC 61757:2018)Fibre optic sensors - Part 1: Generic specification (IEC 61757:2018)33.180.99YODNQDOther fibre optic equipmentICS:Ta slovenski standard je istoveten z:EN IEC 61757:2018SIST EN IEC 61757-1:2018en01-december-2018SIST EN IEC 61757-1:2018SLOVENSKI
STANDARDSIST EN 61757-1:20121DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 61757
October 2018 ICS 33.180.99
Supersedes
EN 61757-1:2012
English Version
Fibre optic sensors - Generic specification (IEC 61757:2018)
Capteurs à fibres optiques - Spécification générique (IEC 61757:2018)
LWL-Sensoren - Fachgrundspezifikation (IEC 61757:2018) This European Standard was approved by CENELEC on 2018-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,
B-1040 Brussels © 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61757:2018 E SIST EN IEC 61757-1:2018

This document supersedes EN 61757-1:2012. This document constitutes a technical revision including the following technical changes with respect to EN 61757-1:2012:
a. change of the document number due to a new structure of the fibre optic sensor standard series; b. update of the normative references and bibliography; c. revision of Annex A. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice The text of the International Standard IEC 61757:2018 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60654-4 NOTE Harmonized as EN 60654-4. IEC 60721-1 NOTE Harmonized as EN 60721-1. SIST EN IEC 61757-1:2018

Normative references to international publications with their corresponding European publications The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1
Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
NOTE 2
Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu.
Publication Year Title EN/HD Year IEC 60050 series
International Electrotechnical Vocabulary
- series
IEC 60060-1 -
High-voltage test techniques -- Part 1: General definitions and test requirements EN 60060-1 -
IEC 60068-1 -
Environmental testing -- Part 1: General and guidance EN 60068-1 -
IEC 60068-2-1 -
Environmental testing - Part 2-1: Tests - Test A: Cold EN 60068-2-1 -
IEC 60068-2-2 -
Environmental testing - Part 2-2: Tests - Test B: Dry heat EN 60068-2-2 -
IEC 60068-2-5 -
Environmental testing – Part 2-5: Tests – Test Sa: Simulated solar radiation at ground level and guidance for solar radiation testing EN IEC 60068-2-5 -
IEC 60068-2-6 -
Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal) EN 60068-2-6 -
IEC 60068-2-10 -
Environmental testing - Part 2-10: Tests - Test J and guidance: Mould growth EN 60068-2-10 -
IEC 60068-2-11 -
Basic environmental testing procedures - Part 2-11: Tests - Test Ka: Salt mist EN 60068-2-11 -
IEC 60068-2-13 -
Basic environmental testing procedures - Part 2-13: Tests - Test M: Low air pressure EN 60068-2-13 -
IEC 60068-2-14 -
Environmental testing - Part 2-14: Tests - Test N: Change of temperature EN 60068-2-14 -
IEC 60068-2-27 -
Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock EN 60068-2-27 -
IEC 60068-2-30 -
Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle) EN 60068-2-30 -
Environmental testing - Part 2-42: Tests - Test Kc: Sulphur dioxide test for contacts and connections EN 60068-2-42 -
IEC 60068-2-43 -
Environmental testing - Part 2-43: Tests - Test Kd: Hydrogen sulphide test for contacts and connections EN 60068-2-43 -
IEC 60068-2-78 -
Environmental testing -- Part 2-78: Tests - Test Cab: Damp heat, steady state EN 60068-2-78 -
IEC 60079-28 -
Explosive atmospheres -- Part 28: Protection of equipment and transmission systems using optical radiation EN 60079-28 -
IEC 60529 -
Degrees of protection provided by enclosures (IP Code) - -
IEC 60793-1-20 -
Optical fibres - Part 1-20: Measurement methods and test procedures - Fibre geometry EN 60793-1-20 -
IEC 60793-1-21 -
Optical fibres -- Part 1-21: Measurement methods and test procedures - Coating geometry EN 60793-1-21 -
IEC 60793-1-31 -
Optical fibres -- Part 1-31: Measurement methods and test procedures - Tensile strength EN 60793-1-31 -
IEC 60793-1-32 -
Optical fibres -- Part 1-32: Measurement methods and test procedures - Coating strippability EN 60793-1-32 -
IEC 60793-1-47 -
Optical fibres – Part 1-47: Measurement methods and test procedures – Macrobending loss EN IEC 60793-1-47 -
IEC 60793-1-54 -
Optical fibres – Part 1-54: Measurement methods and test procedures – Gamma irradiation EN IEC 60793-1-54 -
IEC 60794-1-21 -
Optical fibre cables - Part 1-21: Generic specification - Basic optical cable test procedures - Mechanical tests methods EN 60794-1-21 -
IEC 60825-1 -
Safety of laser products -- Part 1: Equipment classification and requirements EN 60825-1 -
IEC 60874-1 -
Fibre optic interconnecting devices and passive components - Connectors for optical fibres and cables -- Part 1: Generic specification EN 60874-1 -
IEC 61000-4-2 -
Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test EN 61000-4-2 -
IEC 61000-4-3 -
Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test - -
Electromagnetic compatibility (EMC) -- Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test EN 61000-4-4 -
IEC 61000-4-5 -
Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test EN 61000-4-5 -
IEC 61300 series
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures
EN 61300 series
IEC 61300-2-1 -
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-1: Tests - Vibration (sinusoidal) EN 61300-2-1 -
IEC 61300-2-9 -
Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-9: Tests – Shock EN 61300-2-9 -
IEC 61300-2-18 -
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures -- Part 2-18: Tests - Dry heat - High temperature endurance EN 61300-2-18 -
IEC 61300-2-22 -
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-22: Tests - Change of temperature EN 61300-2-22 -
IEC 61300-2-34 -
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures -- Part 2-34: Tests - Resistance to solvents and contaminating fluids of interconnecting components and closures EN 61300-2-34 -
IEC 61300-2-46 -
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-46: Tests - Damp heat cyclic EN 61300-2-46 -
IEC 61300-3-35 -
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-35: Examinations and measurements - Visual inspection of fibre optic connectors and fibre-stub transceivers EN 61300-3-35 -
IEC 61753 series
Fibre optic interconnecting devices and passive components performance standard
EN 61753 series
IEC/TR 61931 -
Fibre optic - Terminology - -
IEC/TR 62222 -
Fire performance of communication cables installed in buildings - -
IEC/TR 62283 -
Optical fibres - Guidance for nuclear radiation tests - -
Fibre optic interconnecting devices and passive components - Part 01: Fibre optic connector cleaning methods - -
ISO/IEC Guide 99 -
International vocabulary of metrology - Basic and general concepts and associated terms (VIM) - -
IEC 61757 Edition 1.0 2018-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Fibre optic sensors – Generic specification
Capteurs à fibres optiques – Spécification générique
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 33.180.99
ISBN 978-2-8322-5303-8
– 2 – IEC 61757:2018 © IEC 2018 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 8 2 Normative references . 8 3 Terms and definitions . 10 4 Quality assurance . 17 5 Test and measurement procedures . 17 5.1 General . 17 5.2 Standard conditions for testing . 17 5.3 Test and measurement equipment requirements . 18 5.4 Visual inspection . 18 5.5 Dimensions . 18 5.6 Metrological properties. 18 5.6.1 General . 18 5.6.2 Metrological parameters . 19 5.7 Optical tests . 19 5.7.1 General . 19 5.7.2 Optical power . 19 5.7.3 Nominal wavelength and appropriate spectral characteristics . 19 5.7.4 State of polarization . 19 5.7.5 Fibre connector performance . 19 5.8 Electrical tests . 19 5.8.1 General . 19 5.8.2 Parameters and test procedures . 20 5.8.3 Voltage stress. 20 5.9 Mechanical tests . 20 5.9.1 General . 20 5.9.2 Parameters and test procedures . 20 5.10 Climatic and environmental tests . 21 5.10.1 General . 21 5.10.2 Parameters and test procedures . 21 5.11 Susceptibility to ambient light . 22 5.12 Resistance to solvents and contaminating fluids . 22 6 Classification . 22 6.1 General . 22 6.2 Measurand . 23 6.2.1 General . 23 6.2.2 Presence/absence of objects or features . 23 6.2.3 Position . 23 6.2.4 Rate of positional change . 23 6.2.5 Flow . 23 6.2.6 Temperature . 23 6.2.7 Force per directional vector . 23 6.2.8 Force per area . 24 6.2.9 Strain . 24 6.2.10 Electromagnetic quantities . 24 SIST EN IEC 61757-1:2018

IEC 61757:2018 © IEC 2018 – 3 –
6.2.11 Ionizing and nuclear radiation . 24 6.2.12 Other physical properties of materials . 24 6.2.13 Composition and specific chemical quantities . 24 6.2.14 Particulates . 24 6.2.15 Imaging . 24 6.3 Transduction principle . 24 6.3.1 General . 24 6.3.2 Active generation of light . 24 6.3.3 Atom-field interaction . 24 6.3.4 Coherence modulation . 25 6.3.5 Intensity modulation . 25 6.3.6 Optical spectrum modulation . 25 6.3.7 Phase modulation . 25 6.3.8 Polarization modulation . 25 6.4 Spatial distribution . 25 6.5 Interface level . 25 7 Marking, labelling, packaging and instruction manual . 25 7.1 Marking of component . 25 7.2 Marking of sealed package and instruction manual . 26 8 IEC type designation . 26 9 Safety aspects . 26 9.1 General . 26 9.2 Personal safety . 26 9.3 Safety in explosive environment . 26 10 Ordering information . 26 11 Drawings . 26 Annex A (informative)
Examples of fibre optic sensors . 27 A.1 General . 27 A.2 Presence/absence of objects or features. 27 A.2.1 Limit sensor (button, lever, key) . 27 A.2.2 Level . 27 A.2.3 Proximity . 27 A.2.4 Photo-interruption . 27 A.3 Position . 28 A.3.1 Linear position . 28 A.3.2 Angular position . 28 A.3.3 Proximity . 28 A.3.4 Zone (area) . 28 A.3.5 Dimensional . 28 A.4 Rate of positional change. 28 A.4.1 Linear speed or velocity . 28 A.4.2 Rotational speed or velocity . 28 A.4.3 Gyroscope . 29 A.4.4 Linear acceleration . 29 A.4.5 Rotational acceleration . 29 A.5 Flow . 29 A.6 Temperature . 29 A.7 Force per directional vector . 30 SIST EN IEC 61757-1:2018

– 4 – IEC 61757:2018 © IEC 2018 A.7.1 Seismic. 30 A.7.2 Vibration . 30 A.7.3 Torque . 30 A.7.4 Weight . 30 A.8 Force per area . 30 A.8.1 Acoustic . 30 A.8.2 Pressure . 30 A.9 Strain . 31 A.10 Electromagnetic quantities . 32 A.10.1 Magnetic field . 32 A.10.2 Electrical current . 32 A.10.3 Electric field . 32 A.10.4 Voltage . 32 A.10.5 Electromagnetic radiation . 33 A.11 Ionizing and nuclear radiation . 33 A.12 Other physical properties of materials . 33 A.12.1 Material refractive index . 33 A.12.2 Density . 33 A.12.3 Viscosity . 33 A.12.4 Damage . 33 A.13 Composition and specific chemical quantities . 33 A.13.1 Chemical . 33 A.14 Particulates . 34 A.14.1 Count . 34 A.14.2 Atomic . 34 A.14.3 Turbidity . 34 A.15 Spatial distribution . 34 A.15.1 Single point . 34 A.15.2 Multiple point . 34 A.15.3 Integrating . 34 A.15.4 Distributed . 34 Bibliography . 35
Figure 1 – Fibre optic sensor configuration with a passive sensing element and separate fibre leads for optical input and output . 12 Figure 2 – Fibre optic sensor configuration with an active sensing element and one optical fibre lead for optical output . 12 Figure 3 – Fibre optic sensor configuration with a passive sensing element and one fibre lead for optical input and output . 13
Table 1 – Electrical test parameters and procedures . 20 Table 2 – Mechanical test parameters and procedures. 21 Table 3 – Climatic and environmental test parameters and procedures . 22
IEC 61757:2018 © IEC 2018 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
FIBRE OPTIC SENSORS –
GENERIC SPECIFICATION
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their 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. IEC collaborates 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 IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any 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 the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61757 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics. This first edition of IEC 61757 cancels and replaces IEC 61757-1, published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to
IEC 61757-1:2012: a) change of the document number due to a new structure of the fibre optic standard series; b) update of the normative references and bibliography; c) revision of Annex A. SIST EN IEC 61757-1:2018

– 6 – IEC 61757:2018 © IEC 2018 The text of this International Standard is based on the following documents: CDV Report on voting 86C/1461/CDV 86C/1488/RVC
Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific document. At this date, the document will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.
IEC 61757:2018 © IEC 2018 – 7 –
INTRODUCTION A fibre optic sensor contains an optical or optically powered sensing element in which the information is created by reaction of light to a measurand. The sensing element can be the fibre itself or an optically powered element inserted along the optical path. In a fibre optic sensor, one or more light parameters are directly or indirectly modified by the measurand somewhere in the optical path, contrary to an optical data link where the information is merely transmitted from the transmitter to the receiver. Generic tests or measurement methods for fibre optic sensors are defined in this document. Where possible, these definitions are by reference to an IEC standard – otherwise the test or measurement method is outlined in the relevant standard of the fibre optic sensor standard series. Annex A gives examples of fibre optic sensors to better illustrate the classification scheme. The examples given are illustrative only and are not limitative, nor do they constitute a recommendation or endorsement of a particular transduction principle.
– 8 – IEC 61757:2018 © IEC 2018 FIBRE OPTIC SENSORS –
GENERIC SPECIFICATION
1 Scope This document is a generic specification covering optical fibres, components and sub-assemblies as they pertain specifically to fibre optic sensing applications. It has been designed to be used as a common working and discussion tool by the vendors of components and subassemblies intended to be integrated in fibre optic sensors, as well as by designers, manufacturers and users of fibre optic sensors independent of any application or installation. The objective of this document is to define, classify and provide the framework for specifying fibre optic sensors, and their specific components and subassemblies. The requirements of this document apply to all related fibre optic sensor standards which belong to IEC 61757 (all parts). Standards of IEC 61757 (all parts) contain requirements specific to sensors for particular quantities subject to measurement, and for a particular style or variant of such a fibre optic sensor. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at www.electropedia.org) IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements IEC 60068-1, Environmental testing – Part 1: General and guidance IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat IEC 60068-2-5, Environmental testing – Part 2-5: Tests – Test Sa: Simulated solar radiation at ground level and guidance for solar radiation testing IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal) IEC 60068-2-10, Environmental testing – Part 2-10: Tests – Test J and guidance: Mould growth IEC 60068-2-11, Basic environmental testing procedures – Part 2-11: Tests – Test Ka: Salt mist IEC 60068-2-13, Basic environmental testing procedures – Part 2-13: Tests – Test M: Low air pressure IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature SIST EN IEC 61757-1:2018

IEC 61757:2018 © IEC 2018 – 9 –
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic (12 h + 12 h cycle) IEC 60068-2-42, Environmental testing – Part 2-42: Tests – Test Kc: Sulphur dioxide test for contacts and connections IEC 60068-2-43, Environmental testing – Part 2-43: Tests – Test Kd: Hydrogen sulphide test for contacts and connections IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state IEC 60079-28, Explosive atmospheres – Part 28: Protection of equipment and transmission systems using optical radiation IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre geometry IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures – Coating geometry IEC 60793-1-31, Optical fibres – Part 1-31: Measurement methods and test procedures – Tensile strength IEC 60793-1-32, Optical fibres – Part 1-32: Measurement methods and test procedures – Coating strippability IEC 60793-1-47, Optical fibres – Part 1-47: Measurement methods and test procedures – Macrobending loss IEC 60793-1-54, Optical fibres – Part 1-54: Measurement methods and test procedures – Gamma irradiation IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable test procedures – Mechanical tests methods IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements
IEC 60874-1, Fibre optic interconnecting devices and passive components – Connectors for optical fibres and cables – Part 1: Generic specification IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement techniques – Electrostatic discharge immunity test IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement techniques – Electrical fast transient/burst immunity test IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement techniques – Surge immunity test SIST EN IEC 61757-1:2018

– 10 – IEC 61757:2018 © IEC 2018 IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic test and measurement procedures IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-1: Tests – Vibration (sinusoidal) IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-9: Tests – Shock IEC 61300-2-18, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-18: Tests – Dry heat – High temperature endurance IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-22: Tests – Change of temperature IEC 61300-2-34, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-34: Tests – Resistance to solvents and contaminating fluids of interconnecting components and closures
IEC 61300-2-46, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-46: Tests – Damp heat, cyclic IEC 61300-3-35, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-35: Examinations and measurements – Visual inspection of fibre optic connectors and fibre-stub transceivers IEC 61753 (all parts), Fibre optic interconnecting devices and passive components performance standard IEC TR 61931, Fibre optic – Terminology IEC TR 62222, Fire performance of communication cables installed in buildings IEC TR 62283, Optical fibres – Guidance for nuclear radiation tests IEC TR 62627-01, Fibre optic interconnecting devices and passive components – Part 01: Fibre optic connector cleaning methods ISO/IEC Guide 99, International vocabulary of metrology – Basic and general concepts and associated terms (VIM) 3 Terms and definitions For the purpose of this document, the terms and definitions given in IEC TR 61931, ISO/IEC Guide 99 (VIM), and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1
accuracy quality which characterizes the ability of a measuring instrument to provide an indicated value close to a true value of the measurand SIST EN IEC 61757-1:2018

IEC 61757:2018 © IEC 2018 – 11 –
Note 1 to entry: This term is used in the "true value" approach. This is a value that would be obtained by a perfect measurement. Note 2 to entry: Accuracy is all the better when the indicated value is closer to the corresponding true value. 3.2
analogue signal interface signal interface which provides analogue output signals in a form directly usable for control or measurement purposes, and which is generally electrical Note 1 to entry: Output schemes should preferably comply with existing interface standards such as those existing for electrical analogue signals. Output schemes can be, for example, 4 mA to 20 mA, 0 mA to 20 mA, 0 V to 5 V, etc. A fibre optic sensor with a photodetector or other square-law detector, or with integrated signal processing electronics is a representative application example. 3.3
characteristic curve calibration curve expression of the relation between indication and corresponding measured quantity value Note 1 to entry: A characteristic curve/calibration curve expresses a one-to-one relation that does not supply a complete measurement result as it bears no information about the measurement uncertainty. [SOURCE: ISO/IEC Guide 99:2007, 4.31, modified – The term "characteristic curve" has been added as a first preferred term, as well as in the note.] 3.4
communication interface digital interface of a fibre optic sensor which provides digital output signals in a form directly usable for control or measurement purposes, or which enables digital communication with other digital devices (e.g. personal computer) Note 1 to entry: It is usually designed to a specific standard (e.g. USB, RS-232) and used for transmitting control and measurement data. 3.5
distributed fibre optic sensor fibre optic sensor which provides a spatially resolved measurement of a measurand over an extended region by means of a continuous sensing element 3.6
drift change in the metrological characteristics of a measuring instrument (and/or fibre optic sensor), generally slow, continuous, not necessarily in the same direction and not related to a change in the measurand 3.7
durability ability of a fibre optic sensor to perform a required function under defined conditions of use and maintenance, until a limiting state is reached Note 1 to entry: A limiting state of an item may be characterized by the end of the useful life, unsuitability for any economic or technological reasons or other relevant factors. 3.8
extrinsic fibre optic sensor fibre optic sensor in which the characteristics of the light are affected externally to the optical fibre(s) by the measurand SIST EN IEC 61757-1:2018

– 12 – IEC 61757:2018 © IEC 2018 3.9
fibre optic sensor part of a measuring instrument, or measuring chain, which is directly affected by the measurand and which generates a change in the optical characteristics of an optical fibre related to the value of the measurand Note 1 to entry: The optical fibre itself acts as the sensing element or it includes an optical or optically powered sensing element and may include one or more of the following (see Figure 1, Figure 2, and Figure 3): – optical fibre lead; – signal conditioning.
Figure 1 – Fibre optic sensor configuration with a passive sensing element and separate fibre leads for optical input and output
Figure 2 – Fibre optic sensor configuration with an active sensing element and one optical fibre lead for optical output IEC Phenomenon Sensing element Optical interface Signal interface Optical receiver Optical source Signal conditioning Optical or optically powered element or sensitive fibre Optical fibre lead(s) IEC Phenomenon Sensing element Optical interface Signal interface Optical receiver Signal conditioning Optical or optically powered element or sensitive fibre Optical fibre lead SIST EN IEC 61757-1:2018

IEC 61757:2018 © IEC 2018 – 13 –
NOTE The signal separation is realized by a Y-splitter. Figure 3 – Fibre optic sensor configuration with a passive sensing element and one fibre lead for optical input and output 3.10
gauge length measurement basis length marked on the parallel portion of a measured object from which the e
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