CEN/TS 17100:2017

SLOVENSKI STANDARD
01-december-2017
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Non-destructive testing - Penetrant and magnetic particle testing - Reference
photographs and sizing of indications
Zerstörungsfreie Prüfung - Eindring- und Magnetpulverprüfung - Referenzfotos und
Dimensionierung von Indikationen
Essais non destructifs - Contrôle par ressuage et par magnétoscopie - Photographies de
référence et dimensionnement des indications
Ta slovenski standard je istoveten z: CEN/TS 17100:2017
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17100
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
September 2017
TECHNISCHE SPEZIFIKATION
ICS 19.100
English Version
Non-destructive testing - Penetrant testing - Reference
photographs and sizing of indications
Essais non destructifs - Contrôle par ressuage et par Zerstörungsfreie Prüfung - Eindringprüfung -
magnétoscopie - Photographies de référence et Referenzfotos und Dimensionierung von Anzeigen
dimensionnement des indications
This Technical Specification (CEN/TS) was approved by CEN on 2 July 2017 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17100:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Safety precautions. 4
5 General principles . 4
5.1 Purpose of a reference photograph . 4
5.2 Lighting equipment . 5
5.2.1 General requirement . 5
5.2.2 White light sources . 5
5.2.3 UV-A and actinic blue radiation sources . 5
5.2.4 Layout of lighting devices . 6
5.3 Filtering . 7
5.3.1 General . 7
5.3.2 White light, colour contrast technique . 7
5.3.3 UV-A light, fluorescent technique . 7
5.3.4 Actinic blue filters . 7
5.4 Record resolution . 8
5.5 Relative position of the camera and the part . 9
5.6 Contrast ratio . 11
5.6.1 Fluorescent process photographs . 11
5.6.2 Colour contrast process photographs . 11
6 Camera settings . 11
7 Record: equipment and techniques . 11
7.1 Digital photographic records . 11
7.2 Digital processing . 12
8 Printouts . 12
8.1 General . 12
8.2 Colour contrast techniques, printouts of photographs under white light . 13
8.3 Fluorescent techniques, printouts of photographs under UV-A radiation . 13
8.4 Resolution patterns . 13
9 Screen displays . 14
Bibliography . 15
European foreword
This document (CEN/TS 17100:2017) has been prepared by Technical Committee CEN/TC 138
“Non-destructive testing”, the secretariat of which is held by AFNOR.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any
or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of
the following countries are bound to announce this Technical Specification: Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic
of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.
1 Scope
This document specifies minimum requirements in order to obtain and reproduce photographs
used as reference records relative to PT (penetrant testing) colour contrast and fluorescent
indications. It also provides requirements for the monitoring of resolution when measurements
are to be indirectly performed by recording.
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.
CEN/TR 16638:2014, Non-destructive testing - Penetrant and magnetic particle testing using blue
light
EN ISO 3059, Non-destructive testing - Penetrant testing and magnetic particle testing - Viewing
conditions (ISO 3059)
EN ISO 12706, Non-destructive testing - Penetrant testing - Vocabulary (ISO 12706)
ISO 12233, Photography — Electronic still picture imaging — Resolution and spatial frequency
responses
ISO 18911, Imaging materials — Processed safety photographic films — Storage practices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12706, ISO 12233,
ISO 18911, CEN/TR 16638 and the following apply:
3.1
reference photograph
approved record with sufficient sharpness and details showing all or part of PT indications used
as a master document and the visual baseline
4 Safety precautions
All relevant international, regional, national and local regulations including health and safety
recommendations and particularly photobiological rating for lighting sources shall be taken into
account.
5 General principles
5.1 Purpose of a reference photograph
A reference photograph is a representative record of an approved indication, obtained after a PT
process. It can be used for indirect sizing of the indication. Precautions shall be taken for the
monitoring of resolution.
The indication record shall not modify the true indication, shape, sharpness and dimensions.
The record shall reproduce the indication in a proper form.
The used medium shall be relevant to the record and sufficient enough to display with the
required quality the record whatever the representation form: printed photograph, display on
an active screen or projection via optical equipment.
5.2 Lighting equipment
5.2.1 General requirement
The sources used to light the scene shall provide an even lighting distribution.
Glare and reflections shall be avoided.
If a flash system is used, precautions shall be taken regarding possible vigneting and probable
non-homogeneous light distribution. Accessories like a diffusing shield or an indirect beam may
be used.
The uniformity lighting factor is defined as the ratio between the minimum irradiance and the
maximum irradiance E /E .
min max
E and E are the average values of at least four of the lowest measurements and four of the
min max
highest measurements, performed at regular intervals in the diagonal of greater dimension
perpendicular to the beam axis. For large scenes, this should not be limited to only eight
measurements; the maximum spacing between two measurements is set at 3,5 cm.
5.2.2 White light sources
For artificial white light, the rendering colour index shall be above 0,7.
Homogeneity of the light distribution shall be better than 0,7.
Colour temperature shall meet the recommendations of the NDT materials supplier, according to
EN ISO 3059.
NOTE Usually intermediate or cold white is used for colour contrast PT.
Colour appearance against Correlated colour temperature (Cct):
— warm below 3300 K;
— neutral 3300 to 5300 K;
— cold above 5300 K.
When a white background is present:
— Red dye indications have to be lit with a neutral or a cold light;
— Blue dye indications have to be lit with a neutral or a warm light.
5.2.3 UV-A and actinic blue radiation sources
Homogeneity of the light distribution shall be better than 0,7.
This shall also apply to other exciting lights when relevant (actinic blue as an example).
5.2.4 Layout of lighting devices

a) Example of an accurate layout of lighting devices

b) Examples of a bad layout of lighting devices
Key
1 part
2 beams
3 camera
4 light source
Figure 1 — Layout examples of lighting devices
The angle between two beams shall be equal to or greater than 90°.
The maximum possible irradiance should be used to reduce the exposure time. The usual
procedure is to use two radiation sources placed at equal distances on each side of the indication
and to place the camera in the middle. This procedure provides equal irradiance on the area of
interest.
The radiation sources should be positioned so that no direct beams or reflections from them
enter the camera.
5.3 Filtering
5.3.1 General
The use of filters helps to bring the records close to the human eyesight by:
— enhancing the existing contrast;
— deleting unwanted background.
5.3.2 White light, colour contrast technique
Colour filters can enhance indications. They shall be chosen according to the colour of the
indication and the white light characteristics.
No cut-off filter is allowed: all the visible wavelength range shall be transmitted.
Polarized filters may be used to delete glare and reflections.
Conversion filters can modify the colour appearance of the source in order to meet the
recommendation of NDT material supplier.
Conversion filters depend on the lamp source. When converting daylight to tungsten (5300 to
2900 K), different filters will be used if starting from daylight or an artificial white light source.
5.3.3 UV-A light, fluorescent technique
UV-A filters shall be used especially if the camera lenses
...