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SLOVENSKI STANDARD
01-november-2022
Neporušitvene preiskave - Termografsko preskušanje - Aktivna termografija z
laserskim vzbujanjem
Non-destructive testing - Thermographic testing - Active thermography with laser
excitation
Zerstörungsfreie Prüfung - Thermografische Prüfung - Aktive Thermografie mit Laser-
Anregung
Essais non destructifs - Analyse thermographique - Thermographie active avec
excitation laser
Ta slovenski standard je istoveten z: EN 17501:2022
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17501
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 19.100
English Version
Non-destructive testing - Thermographic testing - Active
thermography with laser excitation
Essais non destructifs - Analyse thermographique - Zerstörungsfreie Prüfung - Thermografische Prüfung -
Thermographie active avec excitation laser Aktive Thermografie mit Laser-Anregung
This European Standard was approved by CEN on 20 April 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 17501:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Qualification and certification of personnel . 6
5 Principle of laser thermography and experimental setup . 6
5.1 General . 6
5.2 Typical configurations of excitation . 8
5.2.1 General . 8
5.2.2 Laser thermography in static configuration (without relative movement) . 8
5.2.3 Laser thermography in dynamic configuration (with relative movement) . 8
5.2.4 Laser thermography with different temporal excitations . 8
5.2.5 Laser thermography with different spatial excitations . 8
5.3 Laser and laser optics requirements . 8
5.3.1 Laser irradiance and wavelength . 8
5.3.2 Spatial illumination shapes . 9
5.3.3 Switchable laser for lock-in thermography and other temporal techniques . 10
5.3.4 Safety . 10
5.4 Scanning system requirement . 11
5.4.1 General . 11
5.4.2 Test object position and orientation . 11
5.4.3 Movement of the test object . 12
5.4.4 Movement of the whole measurement system . 12
5.4.5 Movement of the laser beam through optics . 12
5.4.6 Movement of the laser beam and IR camera through optics . 12
5.4.7 Setup stability . 12
5.5 Specifications of the IR camera . 12
5.6 Data processing and analysis techniques . 14
5.6.1 General . 14
5.6.2 Spot with relative movement . 14
5.6.3 Line with relative movement . 17
5.7 Data processing for crack characterization. 17
5.7.1 General . 17
5.7.2 Static pulsed laser spot . 17
5.7.3 Continuously scanned laser spot . 19
5.7.4 Continuously scanned laser line . 19
5.8 Data processing and analysis techniques for the determination of lateral thermal
diffusivity . 20
5.9 Data processing and analysis techniques for emissivity correction . 20
5.10 Data processing and analysis techniques for coating thickness control . 20
6 Reference test specimens . 20
7 Calibration, validation and performance of testing . 20
8 Evaluation, classification and registration of thermographic indications . 21
9 Test report . 21
Annex A (informative) List of influential parameters for the NDT qualification of laser
thermographic system . 23
A.1 General . 23
A.2 Input data group parameters . 23
A.2.1 Component and his environment: . 23
A.2.2 Discontinuities: . 23
A.3 NDT laser TT System (procedure parameters) . 24
A.3.1 IR Camera and optics . 24
A.3.2 Laser . 25
A.3.3 Scanning system and set-up . 25
A.3.4 Calibration Blocks . 25
A.3.5 Data processing and analysis . 25
Annex B (informative) Reference blocks . 27
B.1 Test specimen containing an artificial surface breaking notch . 27
B.2 Test specimen containing a natural crack . 28
B.3 Test specimen containing natural cracks – reference block no. 1 for magnetic
particle testing according to EN ISO 9934-2 . 29
B.4 Test specimen containing artificial subsurface notches . 29
Bibliography . 31
European foreword
This document (EN 17501:2022) has been prepared by Technical Committee CEN/TC 138 “Non-
destructive testing”, the secretariat of which is held by AFNOR.
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 December 2022, and conflicting national standards shall
be withdrawn at the latest by December 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.
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 organisations 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.
1 Scope
This document specifies a method and establishes guidelines for non-destructive testing using active
thermography with laser excitation.
Active thermography with laser excitation is mainly applicable, but not limited, to different materials (e.g.
composites, metals, ceramics) and to:
— the detection of surface-breaking discontinuities, particularly cracks;
— the detection of discontinuities located just below the surface or below coatings with an efficiency
that diminishes rapidly with a few mm depth;
— the detection of disbonds and delamination parallel to the examined surface;
— the measurement of thermal material properties, like thermal diffusivity;
— the measurement of coating thickness.
The requirements for the equipment, for the verification of the system, for the surface condition of the
test object, for the scanning conditions, for the recording, the processing and the interpretation of the
results are specified. This document does not apply to the definition of acceptance criteria.
Active thermography with laser excitation can be applied in industrial production as well as in
maintenance and repair (vehicle parts, engine parts, power plant, aerospace, etc.).
2 Normative references
The following documents are referred to in the text in such a way that some or al
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