ASME_B89.4.23-2020.pdf

AN AM E R IC AN NAT IO NAL STANDARDASME B89.4.23-2020X-Ray Computed Tomography(CT)Performance EvaluationASME B89.4.23-2020X-Ray ComputedTomography(CT)PerformanceEvaluationAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USAxDate of Issuance:November 30,2020The next edition of this Standard is scheduled for publication in 2025.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Interpretations arepublishedontheCommitteewebpageandunderhttp:/go.asme.org/InterpsDatabase.PeriodicallycertainactionsoftheASMEB89 Committee may be published as Cases.Cases are published on the ASME website under the B89 Committee Page athttp:/go.asme.org/B89committee as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon the date posted.The B89 Committee Page can be found at http:/go.asme.org/B89committee.There is an option available to automaticallyreceive an e-mail notification when errata are posted to a particular code or standard.This option can be found on theappropriate Committee Page after selecting“Errata”in the“Publication Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunityto participate.The proposed codeorstandardwasmadeavailable forpublic reviewandcommentthatprovidesanopportunityfor additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in thisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2020 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B89 Committee.vi1Scope.12Introduction.13References.34Definitions.35Examples of Rated Operating Conditions.46Metrological Specifications.67Testing.88Compliance With Specifications.12Mandatory AppendicesITest Object Materials.15IIMathematicalAdjustmentstoTestObjectsWithaBaseMaterialThatIsLow-DensityandLow-CTE17IIIMetrological Traceability of ASME B89.4.23 Test Values.19IVTest Value Uncertainty.20Nonmandatory AppendicesADefault Test Objects.21BBidirectional Length.27CSupplementary Test Procedure When Using Test Objects With Low-Density and Low-CTE BaseMaterials.28Figures7.4.1-1Mandatory Work-Zone Measurement Planes and Lines.107.4.3-1Example Test Protocol for One Rated Material.14A-1-1A Square Two-Piece SphereHole Plate With Covering Hole Plate.22A-2-1Sphere Plate With and Without an Obstructing Body.24A-2-2Scalable Design.24A-2-3Further Orientations of the Test Object.25A-3-1Aluminum 3D Test Structure With Infused Silica Spheres.26B-1-1Bidirectional,Unidirectional,and Center-to-Center Lengths.27TableI-1-1CTEs of Material Classes.16Form7.4.3-1Test ProtocolTemplate forUp toThreeRated Materials and aTest Object With One MeasurementPlane.13iiiFOREWORDThe application of X-ray computed tomography(CT)for dimensional metrology has become common in many indus-tries.ThisisprimarilyduetotheabilityofCTsystemstomeasureinsideaworkpiecewithoutrequiringtactileoropticalaccess.However,there are currently no standards that address the performance evaluation of CT systems in a way thatincludes material influence,which is a dominant source of error when these systems are used to evaluate typical work-pieces.For this reason,The American Society of Mechanical Engineers(ASME)decided to form the B89.4.23 WorkingGrouptoproduceastandardforCTperformanceevaluation.ThisStandardistheresultofsignificanteffortbytheworkinggroup to develop a perform