BS EN 12668-2:2010
BRITISHSTANDARD
Non-destructive testing - Characterization and verification of ultrasonic examination equipment
Part 2: Probes
ICS 19.100
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National foreword
This British Standard is the UK implementation of EN 12668-2:2010. It supersedes BS EN12668-2:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legalobligations.
This British Standard was published under the authority of the Standards Policy and Strategy
Amendments/corrigendaissuedsincepublication
Date
Comments
Committee on 28 February 2010 BSI 2010
ISBN 978 0 580 58074 1
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EN 12668-2
EUROPEANSTANDARD NORMEEUROPEENNE EUROPAISCHE NORM
February2010
ICS 19.100
Supersedes EN 12668-2:2001
English Version
Non-destructivetesting- Characterization and verification of
ultrasonicexaminationequipment-Part2:Probes
Essais non destructifs - Caracterisation et verification de
Zerstorungsfreie Prufung - Charakterisierung und Verifizierung der Ultraschall-Prufausristung - Teil 2:
Iappareillage de controle par ultrasons - Partie 2:
Traducteurs
Prufkopfe
This European Standard was approved by CEN on 25 December 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europe an Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning s uch national
standards may be obtained on application to the CEN 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 tra nslation under the responsibility of a CEN member into its own language and notified to the CEN 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Ref. No. EN 12668-2:2010: E
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Contents
Page
Foreword 1
4
Scope Normative references ... Terms and definitions General requirements for compliance.... Technical specificationforprobes... Test equipment..
.5 S E
2 3 4 5 6 6.1 Electronicequipment 6.2 Test blocks and other equipment ... 7
11 11
..1
Performance requirementsforprobes
14 .14 14 14
7.1 Physical aspects.... 7.1.1 Method 7.1.2 Acceptance criterion .... 7.2 Radio frequency pulse shape..... 7.2.1 Method..... 7.2.2 Acceptancecriterion 7.3 Pulse spectrum and bandwidth. 7.3.1 Method, 7.3.2 Acceptance criteria... 7.4 Relative pulse-echo sensitivity 7.4.1 Method.................................... 7.4.2 Acceptance criterion... 7.5 Distance-amplitude curve. 7.5.1 Method............... 7.5.2 Acceptancecriterion 7.6 Electrical impedance 7.6.1 Method. 7.6.2 Acceptance criteria.... 7.7 Beamparametersforimmersionprobes 7.7.1 General. 7.7.2 Beam profile - measurements performed directly on the beam .... 7.7.3 Beam profile -measurements made using an automated scanning system ... 7.8 Beam parameters for contact, straight-beam,singletransducer probes... 7.8.1 General. 7.8.2 Beam divergence and side lobes. 7.8.3 Squint angle and offset.... 7.8.4 Focal distance (near field length)... 7.8.5 Focal width....... 7.8.6 Focal length.... 7.9 Beam parameters for contactangle-beam single transducerprobes. 7.9.1 General 7.9.2 Index poin.t..... 7.9.3 Beam angle and beam divergence.. 7.9.4 Squint angle and offset.... 7.9.5 Focal distance (near field length).... 7.9.6 Focalwidth. 7.9.7 Focal length. 7.10 Beamparametersforcontact,straightbeam,dual-elementprobes 7.10.1 General. 7.10.2 Cross talk..... 7.10.3 Distancetosensitivitymaximum (focal distance) 7.10.4 Axial sensitivity range (focal length)....
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7.10.5 Lateral sensitivityrange (focal width)... 7.11 Beamparametersforcontactanglebeam,dual-elementprobes 7.11.1 General..... 7.11.2 Crosstalk. 7.11.3 Indexpoint... 7.11.4 Beamangleandprofiles 7.11.5 Distancetosensitivitymaximum (focal distance). 7.11.6Axial sensitivity range (focal length).... 7.11.7 Lateral sensitivity range (focal width)... Annex A (normative)Calculation of nearfield length of non-focusing probes... A.1 General...... A.2 Straightbeam probes.... A.3 Anglebeamprobes. Annex B(informative)Calibrationblock forangle-beam probes. Bibliography
..30 .30 ..30 ..31 .31 .31 ..32 ...32
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.32 ..45 .45 ...45 .46 ..48 .52
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Foreword
This document (EN 12668-2:2010)has been prepared by Technical Committee CEN/TC 138"Non-destructive testing",the secretariat of whichis 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 August 2010, and conflicting national standards shall be withdrawn at the latest by August2010 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. This documentsupersedesEN12668-2:2001. EN12668,Non-destructivetesting—Characterization and verification ofultrasonic examination equipment,consistsof the following parts:
Part 1: Instruments
Part2:Probes
Part3:Combinedequipment Annex A is normative.Annex B is informative. 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,Romania,Slovakia,Slovenia,Spain,Sweden, Switzerland and the United Kingdom.
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1 Scope This European Standard covers probes used for ultrasonic non-destructive examination in the following categories with centre frequencies in the range 0,5 MHz to 15 MHz, focusing and without focusing means: a)singleordual transducercontactprobesgeneratingcompressional orshearwaves b)single transducer immersion probes. Where material-dependent ultrasonic values are specified in this document they are based on steels having a sound velocityof(5920±50)m/sforlongitudinalwaves,and(3255±30)m/sfortransversewaves. Periodic tests for probes are not included in this document. Routine tests for the verification of probes using on-site methods are given in EN 12668-3. If parameters in addition to those specified in EN 12668-3 are to be verified during the probe's life time, as agreed upon by the contracting parties, the methods of verification for these additional parameters should be selected from those given in this document.
2Normative references The following referenced documents are indispensable for the application 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. EN1330-4:2010,Non-destructive testing—Terminology—Part4:Termsused inultrasonictesting EN 12668-1,Non-destructive testing-Characterization and verification of ultrasonic examination equipment- Part 1:Instruments ENIso 79631),Non-destructive testing - Ultrasonic testing Specification for calibration block n°2 (ISO7963:1985)
3 Termsanddefinitions For the purposes of this document, the terms and definitions given in EN 1330-4:2010 and the following apply 3.1 dead zone depth of the zone immediately beneath the coupling surface of the work piece, in which it is not possible to detect a given reflector 3.2 focaldistance near field length point on the acoustical axis where the acoustic pressure is at its maximum 3.3 horizontal planeofa soundbeam plane perpendicular to the vertical plane of the sound beam including the acoustical axis in the material
1) Under preparation
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3.4 operatingfrequency fo centre frequency arithmetic mean of upper and lower cut-off frequency
fu+Ji
(1)
fo=
2
NOTE In the frequency spectrum of an echo the upper and lower cut-off-frequencies are determined at -6 dB compared to the maximum amplitude. 3.5 peak-to-peak amplitude h maximumdeviationbetweenthelargestpositive andthelargest negative cycles of thepulse NOTE See Figure 1. 3.6 probe data sheet sheet containing the information required by this standard NOTE The data sheet need not necessarily be a test certificate of performance. 3.7 pulse duration time interval over which the modulus of the unrectified pulse amplitude exceeds 1o % of its maximum amplitude, as shown in Figure 1 3.8 reference side reference side is the right side of an angle beam probe looking in the direction of the beam, unless otherwise specified by the manufacturer 3.9 relative bandwidth frel ratio of the difference between the upper and lower cut-off frequencies f, and fi and the centre frequency f
Afrel = [(fu -fi)/f] × 100 % NOTE
The relative bandwidth is expressed in percent (%)
3.10 squint angleforstraight-beamprobes deviation between the axis of the beam and a perpendicularto the coupling surface atthe emission point NOTE 1 See Figure 2 angle between the sides of the probe housing and the measured beam axis, projected onto the plane of the probe face NOTE 2 See Figure 3 3.11 vertical planeofa sound beam plane in which the sound beam axis in the probe wedge and the sound beam axis in the inspectedcomponentbothlie
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