ASTM_E_2904_-_12.pdf

Designation:E290412Standard Practice forCharacterization and Verification of Phased Array Probes1This standard is issued under the fixed designation E2904;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.Scope1.1 This standard practice covers measurement proceduresfor evaluating certain characteristics of phased-array ultrasonicprobes that are used with phased-array ultrasonic examinationinstrumentation.1.2 This standard practice describes means for obtainingperformance data that may be used to define the acoustic andelectric responses of phased-array ultrasonic probes includingcontact(with or without a wedge)and immersion linearphased-array probes used for ultrasonic nondestructive testingwith central frequencies ranging from 0.5 MHz to 10 MHz.Frequencies outside of this range may use the same methodsbut the testing equipment may vary.1.3 When ultrasonic values dependent on material are speci-fied in this document,they are based on carbon steel with anultrasonic wave propagation speed of 5920 m/s(650 m/s)forlongitudinal wave modes and 3255 m/s(630 m/s)for trans-verse or shear wave modes.1.4 This document describes the characterization and veri-fication procedures that are to be carried out at the end stage ofthe manufacturing process of phased array probes.This docu-ment does not describe the methods or acceptance criteria usedto verify the performance of the entire phased array ultrasonicinstrument and probe.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 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:2E1065 Practice for Evaluating Characteristics of UltrasonicSearch UnitsE1316 Terminology for Nondestructive Examinations3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice,seeTerminology E1316.3.1.2 Technical Specification of the Phased Array Probes:3.1.2.1 datasheetdefined as specification.This is thedocument that defines the general geometry and expectedperformance of a specific model or part number.3.1.2.2 certificationdefined as measured performance ofan individual probe.This is the document that reports themeasured performance of a specific probe(specific to a serialnumber).3.1.2.3 probe typecontact or immersion.3.1.2.4 probe shape and sizeprobe form and dimensions.3.1.3 Terminology for Array Probes:3.1.3.1 active aperturepitch times the number of ele-ments.3.1.3.2 cross-couplingalso called“cross-talk.”An unde-sirable condition where array elements are activated,electri-cally or acoustically,by adjacent elements.3.1.3.3 element widthin a rectangular element,the acous-tic elements short dimension.3.1.3.4 element lengthin a rectangular element,the acous-tic elements long dimension.See passive aperture(also calledelement elevation)and Fig.2.3.1.3.5 element pitch(or pitch)the distance between thecenters of two adjacent array elements.1This practice/guide is under the jurisdiction of ASTM Committee E07 onNondestructive Testing and is the direct responsibility of Subcommittee E07.06 onUltrasonic Method.Current edition approved Nov.1,2012.Published December 2012.DOI:10.1520/E2904-12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3.6 passive aperturethe dimension of an array el-ements length.3.1.3.7 saw cutalso called“kerf,”space or gap.The spacebetween adjacent elements.3.1.3.8 virtual probea group of individual array elements,pulsed simultaneously or at phasing intervals to generate alarger acoustic aperture.4.Summary of Practice4.1 The physical,acoustic and electrical characteristicswhich can be described from the data obtained by proceduresoutlined in this guide are described as follows.4.2 Physical AspectsIdentification and physical dimen-sion aspects of the probe should be noted.Details to be notedare described in 7.1.4.3 Center Frequency,Bandwidth And Time ResponseSection 7.2 describes procedures for determining centerfrequency,bandwidth and time response of the individualelements of the linear array probe.4.4 Sensitivity Range Of ElementsSection 7.3 describes aprocedure to determine variation of sensitivity from oneelement to the next based on a fixed input voltage.4.5 Probe SensitivityThe o