《【BS英国标准】BS EN 462-4-1995 无损检验——射线图像质量 第4部分：图像质量灵敏度和行帧度的试验评定.doc》由会员分享，可在线阅读，更多相关《【BS英国标准】BS EN 462-4-1995 无损检验——射线图像质量 第4部分：图像质量灵敏度和行帧度的试验评定.doc（12页珍藏版）》请在三一文库上搜索。
1、国内外标准大全豆丁网国内外标准下载地址 http:/ STANDARD BS EN462-4:1995Non-destructive testing 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 StandardBS EN 462-4:1995Committees responsible for th
2、isBritish 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 Materials Centr
3、e)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 Industry (NAMAS
4、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 BoardPower Generation
5、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 British Standard, havi
6、ng 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 BSI 12-1998The following BSI references relate to the work on this standard:Committee reference WEE/46Draft for comment 91/83302 DC
7、ISBN 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.Amd. No.DateCommentsAmendments issued since publicationBS EN 462-4:1995ContentsPage Committees responsibleIn
8、side front National forewordiiForeword2Text of EN 462-433List of referencesInside back cover BSI 12-1998iBS EN 462-4:1995National 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
9、of radiographs 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
10、 Corresponding British StandardBS EN 462 Non-destructive testing Image quality of radiographsEN 462-1Part 1:1994 Image quality indicators (wire type) Determination of image quality valueEN 462-2Part 2:1994 Image quality indicators (step/hole type) Determination of image quality valueA British Standa
11、rd does 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 i
12、nside front 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. BSI 12-1998iiEUROPEAN STAND
13、ARD NORME EUROPENNEEUROPISCHE 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 valu
14、es and image quality tablesEssais non destructifs Qualit dimage des radiogrammes Partie 4: Evaluation exprimentale des indices de qualit dimage et des tables de qualit dimageZerstrungsfreie Prfung Bildgte vonDurchstrahlungsaufnahme Teil 4: Experimentelle Ermittlung vonBildgtezahlen und Bildgtetabell
15、enThis European Standard 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 referen
16、ces concerning such national 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
17、its own language and 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, Switz
18、erland and United Kingdom.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 EEN 462-4:19943 BSI 12-1998ForewordThis European Stan
19、dard 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 the same number; the other Parts are the following:EN 462-1, Non-destructive testing Image qu
20、ality 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/hole type) Determination of image quality value.EN 462-3, Non-destructive testing Image quality
21、 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 image unsharpness value.This European Standard shall be given the status of a national standard,
22、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 Regulations, the following countries are bound to implement this European Standard: Austria, B
23、elgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.ContentsPage1Scope32Normative references33Definitions34Experimental evaluation of image quality values35Determination of image quality
24、tables3Foreword2Figure 1 Example for the determination ofan image quality table4Table 1 Example of an image quality table41 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
25、, because, for example, the absorption 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
26、 the same radiographic conditions.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, s
27、ubsequent amendments to or revisions 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 Par
28、t 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/hole type), determination of image quality value.EN 462-3, Non-destructive testing Image quality of radiographs Part 3
29、: Image quality classes for ferrous 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
30、image quality values versus the penetrated 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 s
31、hall be made under the specified conditions. 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 Determinati
32、on of image quality tablesIf different 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 va
33、lues defines the image quality values 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 2AAbove 2 to 3BAbove 3
34、 to 5CAbove 5 to 10DAbove 10 to 20EAbove 20 to 40FAbove 40GBS EN 462-4:1995List of referencesSee national foreword. BSI 12-1998BSI389 Chiswick High RoadLondonW4 4AL| BSI British Standards Institution| BSI is the independent national body responsible for preparing British Standards. It| presents the
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