Designation: E650/E650M − 17Standard Guide forMounting Piezoelectric Acoustic Emission Sensors 1This standard is issued under the f i xed designation E650/E650M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This document provides guidelines for mounting piezo-electric acoustic emission (AE) sensors.1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. Thevalues stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.3 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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2E976 Guide for Determining the Reproducibility ofAcousticEmission Sensor ResponseE1316 Terminology for Nondestructive Examinations3. Terminology3.1 Def i nitions of Terms Specif i c to This Standard:3.1.1 bonding agent—a couplant that physically attaches thesensor to the structure.3.1.2 couplant—a material used at the structure-to-sensorinterface to improve the transfer of acoustic energy across theinterface.3.1.3 mounting f i xture—a device that holds the sensor inplace on the structure to be monitored.3.1.4 sensor—a detection device that transforms the particlemotion produced by an elastic wave into an electrical signal.3.1.5 waveguide, acoustic—a device that couples acousticenergy from a structure to a remotely mounted sensor. Forexample, a solid wire or rod, coupled to a sensor at one end andto the structure at the other.3.2 Def i nitions:3.2.1 For def i nitions of additional terms relating to acousticemission, refer to Terminology E1316.4. Signif i cance and Use4.1 The methods and procedures used in mounting AEsensors can have signif i cant effects upon the performance ofthose sensors. Optimum and reproducible detection of AErequires both appropriate sensor-mounting f i xtures and consis-tent sensor-mounting procedures.5. Mounting Methods5.1 The purpose of the mounting method is to hold thesensor in a f i xed position on a structure and to ensure that theacoustic coupling between the sensor and the structure is bothadequate and constant. Mounting methods will generally fallinto one of the following categories:5.1.1 Compression Mounts—The compression mount holdsthe sensor in intimate contact with the surface of the structurethrough the use of force. This force is generally supplied bysprings, torqued-screw threads, magnets, tape, or elastic bands.The use of a couplant is strongly advised with a compressionmount to maximize the transmission of acoustic energythrough the sensor-structure interface.5.1.2 Bonding—The sensor may be attached directly to thestructure with a suitable adhesive. In this method, the adhesiveacts as the couplant. The adhesive must be compatible with thestructure, the sensor, the environment, and the examinationprocedure.6. Mounting Requirements6.1 Sensor Selection—The correct sensors should be chosento optimally accomplish the AE examination objective. Selec-tion parameters to be considered are as follows: size,1 This 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 June 1, 2017. Published June 2017. Originallyapproved in 1985. Last previous edition approved in 2012 as E650 - 12. DOI:10.1520/E0650-17.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1 Copyright by ASTM Int'l (all rights reserved); Fri Oct 6 09:32:11 EDT 2017Downloaded/printed byUniversity of Edinburgh (University of Edinburgh) pursuant to License Agreement. No further reproductions authorized.
