ASTM_E_2374_-_15.pdf

Designation:E237415Standard Guide forAcoustic Emission System Performance Verification1This standard is issued under the fixed designation E2374;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 System performance verification methods launch stresswaves into the examination article on which the sensor ismounted.The resulting stress wave travels in the examinationarticle and is detected by the sensor(s)in a manner similar toacoustic emission.1.2 This guide describes methods which can be used toverify the response of an Acoustic Emission system includingsensors,couplant,sensor mounting devices,cables and systemelectronic components.1.3 Acoustic emission system performance characteristics,which may be evaluated using this document,include somewaveform parameters,and source location accuracy.1.4 Performance verification is usually conducted prior tobeginning the examination.1.5 Performance verification can be conducted during theexamination if there is any suspicion that the system perfor-mance may have changed.1.6 Performance verification may be conducted after theexamination has been completed.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E750 Practice for Characterizing Acoustic Emission Instru-mentationE976 Guide for Determining the Reproducibility ofAcousticEmission Sensor ResponseE1316 Terminology for Nondestructive ExaminationsE1419 Practice for Examination of Seamless,Gas-Filled,Pressure Vessels Using Acoustic EmissionE1781 Practice for Secondary Calibration of Acoustic Emis-sion Sensors3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 examination articlethe item which is being exam-ined with AE and to which AE sensors are attached.3.1.2 velocitythe measured velocity of a stress wave,traveling in the examination article,using specified AE systemparameters and components.Velocity is often used in triangu-lation calculations to determine the position of the AE source.3.1.3 auto sensor test(AST)an electronic means by whicha sensor can be fed an electronic pulse to excite the examina-tion article.The resulting stress wave in the examination articlecan be measured by the same sensor or by other sensors that areon the same examination article.See 3.1.4 and 3.1.5.3.1.4 auto sensor test-self test modea means by which anAST sensor may be used to check its own performance.3.1.5 auto sensor test-near neighbor modea means bywhich an AST sensor may be used to determine the sensitivityof one or more neighboring sensors on the same examinationarticle.4.Significance and Use4.1 Acoustic Emission data acquisition can be affected bynumerousfactorsassociatedwiththeelectronicinstrumentation,cables,sensors,sensor holders,couplant,theexamination article on which the sensor is mounted,back-ground noise,and the users settings of the acquisition param-eters(for example,threshold).4.2 This guide is not intended to replace annual(or semi-annual)instrumentation calibration(see Practice E750)orsensor recertification(see Practice E1781).4.3 This guide is not intended to replace routine electronicevaluation of AE instrumentation or routine reproducibilityverification of AE sensors(see Guide E976).1This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc-tive Testing and is the direct responsibility of Subcommittee E07.04 on AcousticEmission Method.Current edition approved Dec.1,2015.Published December 2015.Originallyapproved in 2004.Last previous edition approved in 2010 as E2374-10.DOI:10.1520/E2374-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 This guide is not intended to verify the maximumprocessing capacity or speed of an AE system.4.5 This guide does not purport to address all of the safetyconcerns,if any associated with its use.It is the responsibilityof the user of this guide to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.5.Apparatus5.1 To determine system performance a sensor must besubjected to a stress wave t