1、国内外标准大全豆丁网国内外标准下载地址 http:/ R ITIS H STANDARD BS EN462-4:1995Non-destructive testin g Image quality of radiographs Part 4: Experimental evaluation of image quality values and image quality tablesThe European Standard EN 462-4:1994 has the status of aBritish StandardAmd. No. Date CommentsCommittees re
2、sponsible for thisBritish StandardThe preparation of this British Standard was entrusted to Technical Committee WEE/46, Non-destructive testing, upon which the following bodies were represented:Aluminium FederationAssociated Offices Technical Committee Association of Consulting Engineers BNF (Fulmer
3、 Materials Centre)British AirwaysBritish Chemical Engineering Contractors AssociationBritish Coal CorporationBritish Gas plcBritish Institute of Non-destructive Testing British Non-ferrous Metals Federation British Nuclear Fuels plcBritish Railways BoardBritish Steel IndustryDepartment of Trade and
4、Industry (NAMAS Executive) Electricity AssociationEngineering Equipment and Materials Users AssociationHealth and Safety ExecutiveInstitute of PhysicsInstitute of Quality Assurance Light Metal Founders Association Lloyds Register of Shipping Ministry of DefenceNational Radiological Protection BoardP
5、ower Generation Contractors Association (PGCA (BEAMA Ltd.) Railway Industry Association of Great BritainRoyal Society of ChemistrySociety of British Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Steel Casting Research and Trade AssociationWelding InstituteThis Britis
6、h Standard, having been prepared under the direction of the Engineering Sector Board (E/-), was published under theauthority of the StandardsBoard and comes into effect on15 April 1995 B SI 12-1998The following B SI references relate to the work on this standard:Committee reference WEE/46Draft for c
7、omment 91/83302 DCISBN 0 580 28865 2The following bodies were also represented in the drafting of the standard, through subcommittees and panels:British Photographic AssociationNational Nuclear Corporation Ltd.Amendments issued since publicationBS EN 462-4:1995ContentsPage Committees responsible Ins
8、ide front National foreword iiForeword 2Text of EN 462-43 3List of references Inside back cover B SI 12-1998 iNational forewordThis British Standard has been prepared by Technical Committee WEE/46 and is the English language version of EN 462-4: 1994 Non-destructive testing Image quality of radiogra
9、phs Part 4: Experimental evaluation of image quality values and image quality tables, published by the European Committee for Standardization (CEN).EN 462-4:1994 was produced as a result of international discussion in which theUK took an active part.Cross-referencesPublication referred to Correspond
10、ing B ritish StandardBS EN 462 Non-destructive testing Image quality of radiographsEN 462-1 Part 1:1994 Image quality indicators (wire type) Determination of image quality valueEN 462-2 Part 2:1994 Image quality indicators (step/hole type) Determination of image quality valueA British Standard does
11、not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside fr
12、ont cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNEEUR
13、OPISCHE NORMEN 462-4November 1994ICS 19.100Descriptors: Non-destructive tests, industrial radiography, photographic images, quality, image quality indicatorsEnglish versionNon-destructive testing Image quality of radiographs Part 4: Experimental evaluation of image quality values and image quality t
14、ablesEssais non destructifs Qualit dimage des radiogrammes Partie 4: Evaluation exprimentale des indices de qualit dimage et des tables de qualit dimageZerstrungsfreie Prfung Bildgte vonDurchstrahlungsaufnahme Tei l 4: Experimentelle Ermittlung vonBildgtezahlen und BildgtetabellenThis European Stand
15、ard was approved by CEN on 1994-11-10. 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 n
16、ational standards may be obtained on application to the Central Secretariat 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
17、notified to the Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kin
18、gdom.CENEuropean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN membersRef. No. EN 462-4:1994 E1 Scope 32 Normative references 33 Definitions 34 Experimental evaluation
19、 of image quality values 35 Determination of image quality tables 3ForewordThis European Standard has been produced by CEN/TC 138 Non-destructive testing, the secretariat of which is held by the French Association for Standardization (AFNOR).EN 462-4 is a Part of a series of European Standards with
20、the same number; the other Parts are the following:EN 462-1, Non-destructive testing Image quality of radiographs Part 1: Image quality indicators (wire type) Determination of image quality value.EN 462-2, Non-destructive testing Image quality of radiographs Part 2: Image quality indicators (step/ho
21、le type) Determination of image quality value.EN 462-3, Non-destructive testing Image quality of radiographs Part 3: Image quality classes for ferrous metals.EN 462-5, Non-destructive testing Image quality of radiographs Part 5: Image quality indicators (Duplex wire type) Determination of total imag
22、e unsharpness value.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latestby May 1995, and conflicting national standards shall be withdrawn at the latest by May 1995.According to the CEN/CENELEC Internal R
23、egulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.ContentsPageForeword 2Figure 1 Example for
24、 the determination ofan image quality table 4Table 1 Example of an image quality table 41 ScopeThis standard gives instructions for the determination of image quality values and image quality tables.If the IQI requirements from Part 3 of this standard cannot be used, because, for example, the absorp
25、tion coefficients of the IQI material and the inspected material differ by more than 30 %, test exposures are necessary to determine acceptance of image quality values. The image quality values achieved by the test exposures are required for all exposures made under the same radiographic conditions.
26、2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisio
27、ns of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.EN 462-1, Non-destructive testing Image quality of radiographs Part 1: Image quality indicators (wir
28、e type), determination of image quality value.EN 462-2, Non-destructive testing Image quality of radiographs Part 2: Image quality indicators (step/hole type), determination of image quality value.EN 462-3, Non-destructive testing Image quality of radiographs Part 3: Image quality classes for ferrou
29、s metals.3 DefinitionsFor the purposes of this standard, the following definitions apply.3.1image quality indicators (IQI)see EN 462-1 and EN 462-23.2image qualitysee EN 462-1 and EN 462-23.3image quality valuesee EN 462-1 and EN 462-23.4image quality tableachieved image quality values versus the pe
30、netrated wall thickness (see clause 4)4 Experimental evaluation of image quality valuesFor the experimental determination of image quality values, the same radiographic conditions and IQI shall be used as specified for the subsequent examination.Two test exposures shall be made under the specified c
31、onditions. If the image quality values read from these two exposures are identical, this value shall be accepted as the required image quality value. If the image quality values from the two test exposures are different, the procedure shall be repeated.5 Determination of image quality tablesIf diffe
32、rent wall thicknesses of the same material are radiographed, an image quality table shall be established. An example of the image quality values for different penetrated thicknesses according to clause 4 is shown in Figure 1. The step curve below the experimental values defines the image quality val
33、ues and penetrated thickness steps of the image quality table, for an example see Table 1.Figure 1 Example for the determination of an image quality tableTable 1 Example of an image quality tablePenetrated thickness wmmImage quality valueUp to 2 AAbove 2 to 3 BAbove 3 to 5 CAbove 5 to 10 DAbove 10 t
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