ASTM E650/E650M-17

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E650/E650M − 17
Standard Guide for
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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* 3.1.3 mounting fixture—a device that holds the sensor in
place on the structure to be monitored.
1.1 This document provides guidelines for mounting piezo-
3.1.4 sensor—a detection device that transforms the particle
electric acoustic emission (AE) sensors.
motion produced by an elastic wave into an electrical signal.
1.2 Units—The values stated in either SI units or inch-
3.1.5 waveguide, acoustic—a device that couples acoustic
pound units are to be regarded separately as standard. The
energy from a structure to a remotely mounted sensor. For
values stated in each system may not be exact equivalents;
example,asolidwireorrod,coupledtoasensoratoneendand
therefore, each system shall be used independently of the other.
to the structure at the other.
Combining values from the two systems may result in non-
conformance with the standard.
3.2 Definitions:
1.3 This standard does not purport to address all of the 3.2.1 For definitions of additional terms relating to acoustic
safety concerns, if any, associated with its use. It is the emission, refer to Terminology E1316.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 4. Significance and Use
bility of regulatory limitations prior to use.
4.1 The methods and procedures used in mounting AE
1.4 This international standard was developed in accor-
sensors can have significant effects upon the performance of
dance with internationally recognized principles on standard-
those sensors. Optimum and reproducible detection of AE
ization established in the Decision on Principles for the
requires both appropriate sensor-mounting fixtures and consis-
Development of International Standards, Guides and Recom-
tent sensor-mounting procedures.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Mounting Methods
2. Referenced Documents
5.1 The purpose of the mounting method is to hold the
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sensor in a fixed position on a structure and to ensure that the
2.1 ASTM Standards:
acoustic coupling between the sensor and the structure is both
E976 Guide for Determining the Reproducibility ofAcoustic
adequate and constant. Mounting methods will generally fall
Emission Sensor Response
into one of the following categories:
E1316 Terminology for Nondestructive Examinations
5.1.1 Compression Mounts—The compression mount holds
3. Terminology
the sensor in intimate contact with the surface of the structure
3.1 Definitions of Terms Specific to This Standard: through the use of force. This force is generally supplied by
3.1.1 bonding agent—a couplant that physically attaches the springs, torqued-screw threads, magnets, tape, or elastic bands.
sensor to the structure. The use of a couplant is strongly advised with a compression
mount to maximize the transmission of acoustic energy
3.1.2 couplant—a material used at the structure-to-sensor
through the sensor-structure interface.
interface to improve the transfer of acoustic energy across the
5.1.2 Bonding—The sensor may be attached directly to the
interface.
structure with a suitable adhesive. In this method, the adhesive
acts as the couplant. The adhesive must be compatible with the
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This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc-
structure, the sensor, the environment, and the examination
tive Testing and is the direct responsibility of Subcommittee E07.04 on Acoustic
Emission Method.
procedure.
Current edition approved June 1, 2017. Published June 2017. Originally
approved in 1985. Last previous edition approved in 2012 as E650 - 12. DOI:
6. Mounting Requirements
10.1520/E0650-17.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Sensor Selection—The correct sensors should be chosen
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
to optimally accomplish the AE examination objective. Selec-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tion parameters to be considered are as follows: size,
*A Summary of Changes section appears at the end of this standard
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