oSIST prEN ISO 12716:2025
(Main)Non-destructive testing - Acoustic emission testing - Vocabulary (ISO/DIS 12716:2025)
Non-destructive testing - Acoustic emission testing - Vocabulary (ISO/DIS 12716:2025)
This International Standard defines the terminology that is used in acoustic emission testing and forms a
common basis for standards and general use.
Zerstörungsfreie Prüfung - Schallemissionsprüfung - Terminologie (ISO/DIS 12716:2025)
Essais non destructifs - Contrôle par émission acoustique - Vocabulaire (ISO/DIS 12716:2025)
La présente Norme internationale définit la terminologie utilisée dans le contrôle par émission acoustique et forme
une base commune pour les normes et l'utilisation générale.
Neporušitvene preiskave - Akustična emisija - Terminologija (ISO/DIS 12716:2025)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Neporušitvene preiskave - Akustična emisija - Terminologija (ISO/DIS 12716:2025)
Non-destructive testing - Acoustic emission testing - Vocabulary (ISO/DIS 12716:2025)
Zerstörungsfreie Prüfung - Schallemissionsprüfung - Terminologie (ISO/DIS 12716:2025)
Essais non destructifs - Contrôle par émission acoustique - Vocabulaire (ISO/DIS
12716:2025)
Ta slovenski standard je istoveten z: prEN ISO 12716
ICS:
01.040.19 Preskušanje (Slovarji) Testing (Vocabularies)
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 12716
ISO/TC 135/SC 9
Non-destructive testing — Acoustic
Secretariat: SAC
emission testing — Vocabulary
Voting begins on:
ICS: 19.100; 01.040.19
2025-06-04
Voting terminates on:
2025-08-27
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 12716:2025(en)
DRAFT
ISO/DIS 12716:2025(en)
International
Standard
ISO/DIS 12716
ISO/TC 135/SC 9
Non-destructive testing — Acoustic
Secretariat: SAC
emission testing — Vocabulary
Voting begins on:
ICS: 19.100; 01.040.19
Voting terminates on:
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 12716:2025(en)
ii
ISO/DIS 12716:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Terms and definitions . 1
2.1 Terms relating to the physical nature of acoustic emission .1
2.2 Terms relating to the detection and acquisition of acoustic emission signals .2
2.3 Terms relating to the equipment and accessories used for acoustic emission testing .6
2.4 Terms relating to the analysis of acoustic emission signals .8
2.5 Terms relating to the application of acoustic emission testing .9
Bibliography .13
Alphabetical index . 14
iii
ISO/DIS 12716:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
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of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee
SC9, Acoustic emission testing.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/DIS 12716:2025(en)
Introduction
In order to facilitate the understanding of vocabulary, the sorting method of terms and definitions has been
changed from alphabetical to scientific or technical characteristics and related relationships of vocabulary
in this document.
With the development of acoustic emission technology, many terms in the 2001 edition are no longer in use,
and some new terms have emerged. This document retains 14 terms and definitions from the 100 terms and
definitions in the 2001 version and modifies or adds 52 terms and definitions.
v
DRAFT International Standard ISO/DIS 12716:2025(en)
Non-destructive testing — Acoustic emission testing —
Vocabulary
1 Scope
This International Standard defines the terminology that is used in acoustic emission testing and forms a
common basis for standards and general use.
2 Terms and definitions
For the purposes of this document, the terms and definitions given following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
2.1 Terms relating to the physical nature of acoustic emission
2.1.1
acoustic emission
AE
class of phenomena whereby transient elastic waves are generated by the rapid release of energy from
localized sources or the transient waves so generated
Note 1 to entry: local plastic deformation, crack propagation, erosion, corrosion, impact, leakage are examples of such
phenomena.
2.1.2
acoustic emission event
AE event
physical phenomenon giving rise to acoustic emission
2.1.3
acoustic emission source
AE source
spatial element from where one (or more) acoustic emission event(s) originate(s)
2.1.4
acoustic emission wave
AE wave
transient elastic wave generated by an acoustic emission event
Note 1 to entry: Acoustic emission and acoustic emission wave are often used synonymously.
2.1.5
acoustic emission event mechanism
AE event mechanism
process or combination of processes, generating characteristic acoustic emission events
Note 1 to entry: AE event mechanisms can be subdivided into several categories: material and mechanical, macroscopic
and microscopic, primary and secondary.
ISO/DIS 12716:2025(en)
Note 2 to entry: Instead of event mechanism, the term source mechanism is frequently used in AE literature. Source
mechanism relates to the origin of the AE waves radiated in the course of characteristic AE events. In this sense, event
mechanism and source mechanism are synonymic.
2.1.6
acoustic emission event energy
AE event energy
elastic energy released by an acoustic emission event
2.1.7
Kaiser effect
absence of significant acoustic emission until the previous maximum applied load level has been exceeded
Note 1 to entry: The definition of the significant acoustic emission depends on the application.
2.1.8
Felicity effect
appearance of significant acoustic emission at a load level below the previous maximum applied level, e.g. as
observed in composite materials
Note 1 to entry: The definition of the significant acoustic emission depends on the application.
2.1.9
Felicity ratio
ratio between the applied load at which significant acoustic emission reappears during the next application
of loading and the previous maximum applied load
Note 1 to entry: The definition of the significant acoustic emission depends on the application.
2.2 Terms relating to the detection and acquisition of acoustic emission signals
2.2.1
acoustic emission signal
AE signal
electrical signal from an acoustic emission sensor (see 2.3.1) converted from the acoustic emission wave.
Note 1 to entry: This includes burst signals as well as continuous signals.
2.2.2
burst signal
acoustic emission signal having an identifiable beginning and an end
Note 1 to entry: See Figure 1.
ISO/DIS 12716:2025(en)
Key
X time in units of µs
Y signal voltage in units of mV
1 burst signal beginning
2 burst signal end
3 acoustic emission detection threshold
Figure 1 — Burst signal
2.2.3
acoustic emission detection threshold
detection threshold
threshold
voltage level, usually stated in units of dB , that needs to be exceeded in order to detect a burst signal
AE
2.2.4
burst signal beginning
the recognized start of a burst signal, defined as the first time that the signal crosses the detection threshold
2.2.5
burst signal end
the recognized termination of a burst signal, defined as the last time that the signal crosses the detection
threshold for a preset period of time
2.2.6
burst signal features
characteristic quantities describing a burst signal (e.g. arrival time, peak amplitude, duration, rise time, energy)
Note 1 to entry: See Figure 2. Energy is not marked here.
ISO/DIS 12716:2025(en)
Key
1 burst signal rise time
2 burst signal peak amplitude
3 acoustic emission detection threshold
4 time
5 burst signal duration
6 burst signal ring down count
7 signal voltage
8 first threshold crossing, arrival time
9 last threshold crossing
Figure 2 — Basic features of a burst signal
2.2.7
burst signal arrival time
arrival time
time when a burst signal first exceeds the detection threshold
2.2.8
burst signal rise time
rise time
time interval between the burst signal beginning and the time of the peak amplitude
2.2.9
burst signal peak amplitude
amplitude
maximum rectified signal voltage within the burst signal duration
2.2.10
acoustic emission decibel scale
dB scale
AE
dB
AE
dB scale of acoustic emission signal voltage U referred to the sensor output
Note 1 to entry: It is defined by:
dB = 20 log (U/Ur)
AE 10
where the reference voltage is Ur = 1 μV.
ISO/DIS 12716:2025(en)
2.2.11
burst signal duration
duration
time interval between the burst signal beginning and the burst signal end
2.2.12
burst signal ring down count
...
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