SIST EN ISO 19629:2022
(Main)Fine ceramics (advanced ceramics, advanced technical ceramics) - Thermophysical properties of ceramic composites - Determination of unidimensional thermal diffusivity by flash method (ISO 19629:2018)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Thermophysical properties of ceramic composites - Determination of unidimensional thermal diffusivity by flash method (ISO 19629:2018)
This document describes the flash method for the determination of thermal diffusivity of ceramic matrix composites with continuous fibre reinforcement.
In order to conform with the unidimensional heat transfer hypothesis, the experimental conditions are defined such that the material behaves in a homogeneous manner. This involves performing tests in one symmetry axis of the composite.
The method is applicable to materials which are physically and chemically stable during the measurement, and covers the range of temperature from 100 K to 2 800 K. It is suitable for the measurement of thermal diffusivity values in the range 10−4 m2∙s−1 to 10−7 m2∙s−1.
Hochleistungskeramik - Thermophysikalische Eigenschaften keramischer Verbundwerkstoffe - Bestimmung der Temperaturleitfähigkeit (ISO 19629:2018)
Dieses Dokument legt das Flash-Verfahren zur Bestimmung der Temperaturleitfähigkeit von endlos-faserverstärkten Verbundwerkstoffen mit keramischer Matrix fest.
Um der Hypothese der eindimensionalen Wärmeübertragung zu entsprechen, werden die Versuchsbedingun¬gen so festgelegt, dass sich der Werkstoff homogen verhält. Dabei werden Prüfungen in einer Symmetrieachse des Verbundwerkstoffs durchgeführt.
Dieses Dokument ist anzuwenden für Werkstoffe, die sich während der Messung physikalisch und chemisch nicht verändern, und berücksichtigt den Temperaturbereich von 100 K bis 2 800 K. Es ist für die Messung von Temperaturleit¬fähigkeitswerten im Bereich von 10−4 m2⋅s−1 bis 10−7 m2⋅s−1 geeignet.
Céramiques techniques - Propriétés thermophysiques des composites céramiques - Détermination de la diffusivité thermique unidimensionnelle par la méthode flash (ISO 19629:2018)
Le présent document décrit la méthode flash utilisée pour déterminer la diffusivité thermique de composites à matrice céramique renforcés de fibres continues.
Pour se conformer à l'hypothèse de transfert de chaleur unidimensionnel, les conditions expérimentales sont définies de sorte que le matériau se comporte de manière homogène. Cela implique de réaliser les mesures dans un axe de symétrie du composite.
La méthode s'applique aux matériaux qui sont physiquement et chimiquement stables lors de la mesure et couvre la plage de température allant de 100 K à 2 800 K. Elle est adaptée à la mesure des valeurs de diffusivité thermique situées dans la plage de 10−4 m2∙s−1 à 10−7 m2∙s−1.
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Termofizikalne lastnosti keramičnih kompozitov - Ugotavljanje enodimenzionalne toplotne difuzivnosti z bliskovno metodo (ISO 19629:2018)
Ta dokument opisuje bliskovno metodo za določanje toplotne difuzivnosti keramičnih matričnih kompozitov z neprekinjeno ojačitvijo z vlakni.
Za zagotavljanje skladnosti s hipotezo enodimenzionalnega prenosa toplote so opredeljeni eksperimentalni pogoji, pri katerih se material obnaša na homogen način. To vključuje izvajanje preskusov na eni simetrični osi kompozita.
Metoda je uporabna za materiale, ki so med meritvijo fizično in kemično stabilni; obsega temperaturno območje od 100 K do 2800 K. Primerna je za merjenje vrednosti toplotne difuzivnosti v območju od 10−4 m2 s−1 do 10−7 m2 s−1.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 19629:2022
01-junij-2022
Nadomešča:
SIST EN 1159-2:2004
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Termofizikalne
lastnosti keramičnih kompozitov - Ugotavljanje enodimenzionalne toplotne
difuzivnosti z bliskovno metodo (ISO 19629:2018)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Thermophysical
properties of ceramic composites - Determination of unidimensional thermal diffusivity by
flash method (ISO 19629:2018)
Hochleistungskeramik - Thermophysikalische Eigenschaften keramischer
Verbundwerkstoffe - Bestimmung der Temperaturleitfähigkeit (ISO 19629:2018)
Céramiques techniques - Propriétés thermophysiques des composites céramiques -
Détermination de la diffusivité thermique unidimensionnelle par la méthode flash (ISO
19629:2018)
Ta slovenski standard je istoveten z: EN ISO 19629:2022
ICS:
81.060.30 Sodobna keramika Advanced ceramics
SIST EN ISO 19629:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 19629:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 19629:2022
EN ISO 19629
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 81.060.30 Supersedes EN 1159-2:2003
English Version
Fine ceramics (advanced ceramics, advanced technical
ceramics) - Thermophysical properties of ceramic
composites - Determination of unidimensional thermal
diffusivity by flash method (ISO 19629:2018)
Céramiques techniques - Propriétés thermophysiques Hochleistungskeramik - Thermophysikalische
des composites céramiques - Détermination de la Eigenschaften keramischer Verbundwerkstoffe -
diffusivité thermique unidimensionnelle par la Bestimmung der Temperaturleitfähigkeit (ISO
méthode flash (ISO 19629:2018) 19629:2018)
This European Standard was approved by CEN on 27 March 2022.
CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19629:2022 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 19629:2022
EN ISO 19629:2022 (E)
Contents Page
European foreword . 3
2
---------------------- Page: 4 ----------------------
SIST EN ISO 19629:2022
EN ISO 19629:2022 (E)
European foreword
The text of ISO 19629:2018 has been prepared by Technical Committee ISO/TC 206 "Fine ceramics” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 19629:2022
by Technical Committee CEN/TC 184 “Advanced technical ceramics” the secretariat of which is held by
DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2022, and conflicting national standards shall
be withdrawn at the latest by October 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1159-2:2003.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 19629:2018 has been approved by CEN as EN ISO 19629:2022 without any modification.
3
---------------------- Page: 5 ----------------------
SIST EN ISO 19629:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 19629:2022
INTERNATIONAL ISO
STANDARD 19629
First edition
2018-08
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Thermophysical properties of ceramic
composites — Determination of
unidimensional thermal diffusivity by
flash method
Céramiques techniques — Propriétés thermophysiques des
composites céramiques — Détermination de la diffusivité thermique
unidimensionnelle par la méthode flash
Reference number
ISO 19629:2018(E)
©
ISO 2018
---------------------- Page: 7 ----------------------
SIST EN ISO 19629:2022
ISO 19629:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 19629:2022
ISO 19629:2018(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Heat pulse source. 2
5.2 Test chamber . 2
5.3 Detectors . 2
5.3.1 Measurement of absolute temperature . 2
5.3.2 Transient detectors . . 3
5.4 Data acquisition . 3
6 Test specimens. 4
7 Test specimen preparation . 4
7.1 Machining and preparation . 4
7.2 Number of test specimens . 4
8 Procedure. 4
8.1 Calibration of apparatus . 4
8.2 Procedure . 4
9 Results . 5
9.1 Determination of the thermal diffusivity . 5
9.2 Sources of uncertainties. 5
10 Test report . 5
Annex A (informative) Unidimensional thermal model . 9
Annex B (informative) Experimental characteristics for optimal measurements .11
Bibliography .12
© ISO 2018 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 19629:2022
ISO 19629:2018(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 19629:2022
INTERNATIONAL STANDARD ISO 19629:2018(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Thermophysical properties of ceramic
composites — Determination of unidimensional thermal
diffusivity by flash method
1 Scope
This document describes the flash method for the determination of thermal diffusivity of ceramic
matrix composites with continuous fibre reinforcement.
In order to conform with the unidimensional heat transfer hypothesis, the experimental conditions are
defined such that the material behaves in a homogeneous manner. This involves performing tests in one
symmetry axis of the composite.
The method is applicable to materials which are physically and chemically stable during the
measurement, and covers the range of temperature from 100 K to 2 800 K. It is suitable for the
−4 2 −1 −7 2 −1
measurement of thermal diffusivity values in the range 10 m ∙s to 10 m ∙s .
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.
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for
external measurements — Design and metrological characteristics
ISO 20507, Fine ceramics (advanced ceramics, advanced technical ceramics) — Vocabulary
EN 60584-1, Thermocouples — Part 1: Reference tables (IEC 60584‑1:1995)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20507 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
thermal diffusivity
a
ratio of the thermal conductivity to the product of the bulk density and the specific heat capacity
3.2
transient half time
t
1/2
time from the initiation of the pulse until the increase of the temperature on the back face of the test
specimen reaches one half of the maximum temperature increase
© ISO 2018 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 19629:2022
ISO 19629:2018(E)
3.3
thickness
h
dimension of the test specimen in the direction of heat transfer measurement
4 Principle
One side of a plane- and parallel-face test piece is exposed to a uniformly distributed energy pulse that
is of very short duration compared with the transient half time.
The transient temperature rise (ΔT) on the opposite face (back face) or a quantity directly proportional
to ΔT is recorded as a function of time (t) (see Figure 1).
The thermal diffusivity is obtained by comparing the experimental thermogram with a theoretical
model, which is a unidimensional analytical thermal model, with two parameters, as described in
Annex A. If other models are used, they are to be specified in the test report.
5 Apparatus
5.1 Heat pulse source
The heat pulse source may be a flash tube or a pulse laser.
The pulse energy shall be as uniform as possible over the front face of the test piece.
5.2 Test chamber
The test chamber shall be either a furnace or a cryostat, capable of operation within the temperature
...
SLOVENSKI STANDARD
oSIST prEN ISO 19629:2022
01-januar-2022
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Termofizikalne
lastnosti keramičnih kompozitov - Ugotavljanje enodimenzionalne toplotne
difuzivnosti z bliskovno metodo (ISO 19629:2018)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Thermophysical
properties of ceramic composites - Determination of unidimensional thermal diffusivity by
flash method (ISO 19629:2018)
Hochleistungskeramik - Thermophysikalische Eigenschaften keramischer
Verbundwerkstoffe - Bestimmung der Temperaturleitfähigkeit (ISO 19629:2018)
Céramiques techniques - Propriétés thermophysiques des composites céramiques -
Détermination de la diffusivité thermique unidimensionnelle par la méthode flash (ISO
19629:2018)
Ta slovenski standard je istoveten z: prEN ISO 19629
ICS:
81.060.30 Sodobna keramika Advanced ceramics
oSIST prEN ISO 19629:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 19629:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 19629:2022
INTERNATIONAL ISO
STANDARD 19629
First edition
2018-08
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Thermophysical properties of ceramic
composites — Determination of
unidimensional thermal diffusivity by
flash method
Céramiques techniques — Propriétés thermophysiques des
composites céramiques — Détermination de la diffusivité thermique
unidimensionnelle par la méthode flash
Reference number
ISO 19629:2018(E)
©
ISO 2018
---------------------- Page: 3 ----------------------
oSIST prEN ISO 19629:2022
ISO 19629:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 19629:2022
ISO 19629:2018(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Heat pulse source. 2
5.2 Test chamber . 2
5.3 Detectors . 2
5.3.1 Measurement of absolute temperature . 2
5.3.2 Transient detectors . . 3
5.4 Data acquisition . 3
6 Test specimens. 4
7 Test specimen preparation . 4
7.1 Machining and preparation . 4
7.2 Number of test specimens . 4
8 Procedure. 4
8.1 Calibration of apparatus . 4
8.2 Procedure . 4
9 Results . 5
9.1 Determination of the thermal diffusivity . 5
9.2 Sources of uncertainties. 5
10 Test report . 5
Annex A (informative) Unidimensional thermal model . 9
Annex B (informative) Experimental characteristics for optimal measurements .11
Bibliography .12
© ISO 2018 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 19629:2022
ISO 19629:2018(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 19629:2022
INTERNATIONAL STANDARD ISO 19629:2018(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Thermophysical properties of ceramic
composites — Determination of unidimensional thermal
diffusivity by flash method
1 Scope
This document describes the flash method for the determination of thermal diffusivity of ceramic
matrix composites with continuous fibre reinforcement.
In order to conform with the unidimensional heat transfer hypothesis, the experimental conditions are
defined such that the material behaves in a homogeneous manner. This involves performing tests in one
symmetry axis of the composite.
The method is applicable to materials which are physically and chemically stable during the
measurement, and covers the range of temperature from 100 K to 2 800 K. It is suitable for the
−4 2 −1 −7 2 −1
measurement of thermal diffusivity values in the range 10 m ∙s to 10 m ∙s .
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.
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for
external measurements — Design and metrological characteristics
ISO 20507, Fine ceramics (advanced ceramics, advanced technical ceramics) — Vocabulary
EN 60584-1, Thermocouples — Part 1: Reference tables (IEC 60584‑1:1995)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20507 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
thermal diffusivity
a
ratio of the thermal conductivity to the product of the bulk density and the specific heat capacity
3.2
transient half time
t
1/2
time from the initiation of the pulse until the increase of the temperature on the back face of the test
specimen reaches one half of the maximum temperature increase
© ISO 2018 – All rights reserved 1
---------------------- Page: 7 ----------------------
oSIST prEN ISO 19629:2022
ISO 19629:2018(E)
3.3
thickness
h
dimension of the test specimen in the direction of heat transfer measurement
4 Principle
One side of a plane- and parallel-face test piece is exposed to a uniformly distributed energy pulse that
is of very short duration compared with the transient half time.
The transient temperature rise (ΔT) on the opposite face (back face) or a quantity directly proportional
to ΔT is recorded as a function of time (t) (see Figure 1).
The thermal diffusivity is obtained by comparing the experimental thermogram with a theoretical
model, which is a unidimensional analytical thermal model, with two parameters, as described in
Annex A. If other models are used, they are to be specified in the test report.
5 Apparatus
5.1 Heat pulse source
The heat pulse source may be a flash tube or a pulse laser.
The pulse energy shall be as uniform as possible over the front face of the test piece.
5.2 Test chamber
The test chamber shall be either a furnace or a cryostat, capable of operation within the temperature
range required, or a draught proof enclosure for ambient temperature measurement.
The design of the furnace shall meet the following requirements:
a) it shall contain a working area in which the spatial temperature gradient is sufficiently low (≤5 K
over working area width) to result in a homogeneous temperature on the test piece;
b) in steady state conditions, the drift in temperature shall be less than 0,01 K/s;
c) the heat pulse source may be placed either inside the furnace or outside the furnace; in the latter
case, the furnace shall be fitted with a window, transparent to the pulse radiation;
d) the furnace shall provide suitable access for measurement of ΔT or a quantity directly proportional
to ΔT on the back face of the test piece.
When the test is performed under gas, the test piece should be in a horizontal position in order to
reduce convection effects of the gas on the specimen.
NOTE Measurement under vacuum will reduce convection losses and will limit the oxidation phenomena at
high temperature.
5.3 Detectors
5.3.1 Measurement of absolute temperature
The temperature of the test piece shall be measured either with a thermocouple (in accordance with
EN 60584-1) or with an optical pyrometer.
2 © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 19629:2022
ISO 19629:2018(E)
5.3.2 Transient detectors
The detector shall be either a quantum radiation detector, a thermocouple or any other means that
does not disturb the measurement of the transient response of the specimen. It shall be capable of
detecting changes of 0,05 K in the temperature of the test piece, with a linear response over the range of
temperature change less than or equal to 5 K.
The choice of the detector depends primarily on both the temperature range in which the measurement
is to be performed and the characteristic time of the sample. The first parameter sets the spectral
range for which the detection sensitivity of the detector shall be maximum; the second parameter fixes
its time constant.
It shall have a response time as shown in Formula (1).
2
t ≤ 0,002 h /a (1)
d
where
t is the response time, in seconds (s);
d
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.