IEC 61757-1:2012

Fibre optic sensors - Part 1: Generic specification

IEC 61757-1:2012 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 vendor 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 generic specification is to define, classify and provide the framework for specifying fibre optic sensors, and their specific components and subassemblies. The requirements of this standard apply to all related sectional, family, and detail specifications. Sectional specifications will contain requirements specific to sensors for particular quantities subject to measurement. Within each sectional specification, family and detail specifications contain requirements for a particular style or variant of a fibre optic sensor of that sectional specification. This edition includes a substantial technical update of all clauses, definitions, and cited references with respect to the previous edition.

Capteurs à fibres optiques - Partie 1: Spécification générique

La CEI 61757-1:2012 est une spécification générique qui traite des fibres optiques, des composants et des sous-ensembles intervenant de manière spécifique dans des applications de capteurs à fibres optiques. Elle a été conçue pour être utilisée comme un outil de travail et un support de discussion par les vendeurs de composants et de sous-ensembles destinés à être intégrés à des capteurs à fibres optiques, ainsi que par les concepteurs, les fabricants et les utilisateurs de capteurs à fibre optiques indépendants de toute application ou installation. La présente spécification générique a pour objectif de définir, de classer et de fournir un cadre de travail pour la spécification des capteurs à fibres optiques, de leurs composants et de leurs sous-ensembles. Les exigences de la présente Norme s'appliquent à toutes les spécifications particulières, les spécifications de famille et les spécifications intermédiaires associées. Les spécifications intermédiaires contiendront des exigences spécifiques aux capteurs pour des grandeurs particulières à mesurer. Chaque spécification intermédiaire, chaque spécification de famille et chaque spécification particulière contient des exigences pour un modèle ou une variante particulier d'un capteur à fibres optiques de cette spécification intermédiaire. La présente édition contient une mise à jour technique significative de tous les articles, toutes les définitions et toutes les références citées par rapport à l'édition précédente.

General Information

• Status: Replaced
• Publication Date: 14-May-2012
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.030 - Magnetic materials
• ICS: 33.180.99 - Other fibre optic equipment
• Technical Committee: SC 86C - Fibre optic systems and active devices
• Drafting Committee: WG 1 - TC 86/SC 86C/WG 1
• Current Stage: DELPUB - Deleted Publication
• Start Date: 30-Dec-2016
• Completion Date: 25-Jan-2018

Relations

• Replaced By: IEC 61757:2018 - Fibre optic sensors - Generic specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61757-1


®


Edition 2.0 2012-05



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
colour
inside


Fibre optic sensors –
Part 1: Generic specification

Capteurs à fibres optiques –
Partie 1: Spécification générique


IEC 61757-1:2012

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IEC 61757-1



®



Edition 2.0 2012-05







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE
colour

inside










Fibre optic sensors –

Part 1: Generic specification




Capteurs à fibres optiques –

Partie 1: Spécification générique

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX V


ICS 33.180.99 ISBN 978-2-83220-090-2



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS




FOREWORD . 4

1 Scope . 6

2 Normative references . 6

3 Terms and definitions . 8


4 Quality assurance . 15

5 Test and measurement procedures . 15
5.1 General . 15
5.2 Standard conditions for testing . 16
5.3 Test and measurement equipment requirements . 16
5.4 Visual inspection . 16
5.5 Dimensions . 16
5.6 Metrological properties . 16
5.6.1 General . 16
5.6.2 Metrological parameters . 17
5.7 Optical tests . 17
5.7.1 General . 17
5.7.2 Optical power . 17
5.7.3 Nominal wavelength and appropriate spectral characteristics . 17
5.7.4 State of polarization . 17
5.7.5 Fibre connector performance . 17
5.8 Electrical tests . 18
5.8.1 General . 18
5.8.2 Parameters and test procedures . 18
5.8.3 Voltage stress . 18
5.9 Mechanical tests . 18
5.9.1 General . 18
5.9.2 Parameters and test procedures . 19
5.10 Climatic and environmental tests . 19
5.10.1 General . 19
5.10.2 Parameters and test procedures . 19

5.11 Susceptibility to ambient light . 20
5.12 Resistance to solvents and contaminating fluids . 20
6 Classification . 20
6.1 General . 20
6.2 Measurand . 20
6.2.1 Presence/absence of objects or features . 20
6.2.2 Position . 21
6.2.3 Rate of positional change . 21
6.2.4 Flow . 21
6.2.5 Temperature . 21
6.2.6 Force x directional vector . 21
6.2.7 Force per area . 22
6.2.8 Strain . 22
6.2.9 Electromagnetic quantities . 22

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61757-1 © IEC:2012 – 3 –


6.2.10 Ionizing and nuclear radiation . 22

6.2.11 Other physical properties of materials . 22

6.2.12 Composition and specific chemical quantities . 23

6.2.13 Particulates . 23

6.2.14 Imaging . 23

6.3 Transduction principle . 23

6.3.1 Active generation of light . 23

6.3.2 Atom-field interaction . 23

6.3.3 Coherence modulation . 23

6.3.4 Intensity modulation . 23

6.3.5 Optical spectrum modulation . 23
6.3.6 Phase modulation . 24
6.3.7 Polarization modulation . 24
6.4 Spatial distribution . 24
6.5 Interface level . 24
7 Marking, labelling, packaging . 24
7.1 Marking of component . 24
7.2 Marking of sealed package . 24
8 IEC type designation . 24
9 Safety aspects . 25
9.1 General . 25
9.2 Personal safety . 25
9.3 Safety in explosive environment . 25
10 Ordering information . 25
11 Drawings included in the sectional, family and detail specifications . 25
Annex A (informative) Examples of fibre optic sensors . 26
Bibliography . 34

Figure 1 – Fibre optic sensor configuration with a passive sensing element and
separate fibre leads for optical input and output . 14
Figure 2 – Fibre optic sensor configuration with an active sensing . 14
Figure 3 – Fibre optic sensor configuration with a passive sensing element and one
fibre lead for optical input and output; signal separation is realized by a Y-splitter . 15

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INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________



FIBRE OPTIC SENSORS –



Part 1: 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
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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 61757-1 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.

This second edition cancels and replaces the first edition published in 1998 and constitutes a
technical revision.
This edition includes a substantial technical update of all clauses, definitions, and cited
references with respect to the previous edition.
The text of this standard is based on the following documents:
FDIS Report on voting
86C/1059/FDIS 86C/1066/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

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61757-1 © IEC:2012 – 5 –


This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.


A list of all the parts in the IEC 61757 series, published under the general title Fibre optic

sensors, can be found on the IEC website.


The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
considered to be useful for the correct
that it contains colours which are
understanding of its contents. Users should therefore print this document using a
colour printer.

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FIBRE OPTIC SENSORS –



Part 1: Generic specification








1 Scope


This part of IEC 61757 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 vendor 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 generic specification is to define, classify and provide the framework for
specifying fibre optic sensors, and their specific components and subassemblies. The
requirements of this standard apply to all related sectional, family, and detail specifications.
Sectional specifications will contain requirements specific to sensors for particular quantities
subject to measurement. Within each sectional specification, family and detail specifications
contain requirements for a particular style or variant of a fibre optic sensor of that sectional
specification.
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 are defined for specified attributes. Where possible,
these definitions are by reference to an IEC standard – otherwise the test or measurement
method is outlined in the relevant sectional, family and/or detail specification.
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.
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 (including any
amendments) applies.
IEC 60050, International Electrotechnical Vocabulary
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

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61757-1 © IEC:2012 – 7 –


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
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 – 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 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 60793-1-1, Optical fibres – Part 1-1: Measurement methods and test procedures –
General and guidance
IEC 60793-1-54, Optical fibres – Part 1-54: Measurement methods and test procedures -

Gamma irradiation
IEC 60793-2, Optical fibres – Part 2: Product specifications – General
IEC 60794-1-1, Optical fibre cables – Part 1: Generic specification – General
IEC 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test
procedures
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

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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


IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic test

and measurement procedures

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 – Fibre optic
connector endface visual and automated inspection
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 62362, Selection of optical fibre cable specifications relative to mechanical, ingress,
climatic or electromagnetic characteristics – Guidance

IEC/TR 62627-01, Fibre optic interconnecting devices and passive components – Part 01: Fibre
optic connector cleaning methods
ISO/IEC Guide 98-3, Uncertainty of measurement – Part 3: Guide to the expression of
uncertainty in measurement (GUM:1995)
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 International Standard, the definitions of IEC 60050 (IEV),
IEC/TR 61931, ISO/IEC Guide 99 (VIM), and the following apply:

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61757-1 © IEC:2012 – 9 –


3.1

accuracy

quality which characterizes the ability of a measuring instrument [of a fibre optic sensor] to

provide an indicated value close to a true value of the measurand


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.

[SOURCE: IEC 60050-311:2001, 311-06-08, modified]


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, 4-20 mA, 0-20 mA, 0-5V, 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
[SOURCE: ISO/IEC Guide 99]
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.
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 divices (e.g. personal computer)
Note 1 to entry: It is usually designed to a specific standard (e.g. Universal Serial Interface Bus 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 continuo
...