ASTM E650/E650M-12

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E650/E650M–12
Standard Guide for
1
Mounting Piezoelectric Acoustic Emission Sensors
This standard is issued under the fixed designation E650/E650M; the number immediately following the designation indicates the year
of 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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This document provides guidelines for mounting piezoelectric 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. The values 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 the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E976 Guide for Determining the Reproducibility of Acoustic Emission Sensor Response
E1316 Terminology for Nondestructive Examinations
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bonding agent—a couplant that physically attaches the sensor to the structure.
3.1.2 couplant—a material used at the structure-to-sensor interface to improve the transfer of acoustic energy across the
interface.
3.1.3 mounting fixture—a device that holds the sensor in place on the structure to be monitored.
3.1.4 sensor—a detection device that transforms the particle motion produced by an elastic wave into an electrical signal.
3.1.5 waveguide, acoustic—a device that couples acoustic energy from a structure to a remotely mounted sensor. For example,
a solid wire or rod, coupled to a sensor at one end and to the structure at the other.
3.2 Definitions:
3.2.1 For definitions of additional terms relating to acoustic emission, refer to Terminology E1316.
4. Significance and Use
4.1 The methods and procedures used in mounting AE sensors can have significant effects upon the performance of those
sensors. Optimum and reproducible detection of AE requires both appropriate sensor-mounting fixtures and consistent
sensor-mounting procedures.
5. Mounting Methods
5.1 The purpose of the mounting method is to hold the sensor in a fixed position on a structure and to ensure that the acoustic
coupling between the sensor and the structure is both adequate and constant. Mounting methods will generally fall into one of the
following categories:
5.1.1 Compression Mounts—The compression mount holds the sensor in intimate contact with the surface of the structure
through the use of force. This force is generally supplied by springs, torqued-screw threads, magnets, tape, or elastic bands. The
use of a couplant is strongly advised with a compression mount to maximize the transmission of acoustic energy through the
sensor-structure interface.
5.1.2 Bonding—The sensor may be attached directly to the structure with a suitable adhesive. In this method, the adhesive acts
1
This guide is under the jurisdiction ofASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.04 onAcoustic Emission
Method.
Current edition approved June 15, 2012. Published July 2012. Originally approved in 1985. Last previous edition approved in 2007 as E650 - 97(2007). DOI:
10.1520/E0650-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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E650/E650M–12
as the couplant. The adhesive must be compatible with the structure, the sensor, the environment, and the examination procedure.
6. Mounting Requirements
6.1 Sensor Selection—The correct sensors should be chosen to optimally accomplish the acoustic-emission examination
objective. Sensor parameters to be considered are as follows: size, sensitivity, frequency response, surface-motion response, and
environmental and
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E650–97 (Reapproved 2007) Designation: E650/E650M – 12
Standard Guide for
1
Mounting Piezoelectric Acoustic Emission Sensors
This standard is issued under the fixed designation E650/E650M; the number immediately following the designation indicates the year
of 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 piezoelectric acoustic emission (AE) sensors.
1.2
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values 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 the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E976 Guide for Determining the Reproducibility of Acoustic Emission Sensor Response
E1316 Terminology for Nondestructive Examinations
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bonding agent—a couplant that physically attaches the sensor to the structure.
3.1.2 couplant—a material used at the structure-to-sensor interface to improve the transfer of acoustic energy across the
interface.
3.1.3 mounting fixture—a device that holds the sensor in place on the structure to be monitored.
3.1.4 sensor—a detection device that transforms the particle motion produced by an elastic wave into an electrical signal.
3.1.5 waveguide, acoustic—a device that couples acoustic energy from a structure to a remotely mounted sensor. For example,
a solid wire or rod, coupled to a sensor at one end and to the structure at the other.
3.2 Definitions:
3.2.1 For definitions of additional terms relating to acoustic emission, refer to Terminology E1316.
4. Significance and Use
4.1 The methods and procedures used in mounting AE sensors can have significant effects upon the performance of those
sensors. Optimum and reproducible detection of AE requires both appropriate sensor-mounting fixtures and consistent
sensor-mounting procedures.
5. Mounting Methods
5.1 The purpose of the mounting method is to hold the sensor in a fixed position on a structure and to ensure that the acoustic
coupling between the sensor and the structure is both adequate and constant. Mounting methods will generally fall into one of the
following categories:
5.1.1 Compression Mounts—The compression mount holds the sensor in intimate contact with the surface of the structure
through the use of force. This force is generally supplied by springs, torqued-screw threads, magnets, tape, or elastic bands. The
1
This guide is under the jurisdiction ofASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.04 onAcoustic Emission
Method.
´1
Current edition approved July 1, 2007. Published July 2007. Originally approved in 1985. Last previous edition approved in 2002 as E650-97(2002) . DOI:
10.1520/E0650-97R07.
Current edition approved June 15, 2012. Published July 2012. Originally approved in 1985. Last previous edition approved in 2007 as E650 - 97(2007). DOI:
10.1520/E0650-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E650/E650M – 12
use of a couplant is strongly advised with a compression mount to maximize the transmission of acoustic energy through the
sensor-structure interface.
5.1.2 Bonding—The sensor may be attached directly to the structure with a suitable adhesive. In this method, the adhesive acts
as the couplant. The adhesive must be compatible with the structure, the sensor, the environment, and the examination procedure.
6. Mounting Requirements
6.1 Sensor Selection—The correct sensors
...