IEC 62127-3:2022/AMD1:2026
(Amendment)Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields
Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields
Amendement 1 - Ultrasons - Hydrophones - Partie 3: Propriétés des hydrophones pour les champs ultrasoniques
General Information
- Status
- Published
- Publication Date
- 23-Feb-2026
- Technical Committee
- TC 87 - Ultrasonics
- Drafting Committee
- WG 8 - TC 87/WG 8
- Current Stage
- PPUB - Publication issued
- Start Date
- 24-Feb-2026
- Completion Date
- 16-Mar-2026
Relations
- Effective Date
- 21-Jun-2024
Overview
IEC 62127-3:2022/AMD1:2026 is Amendment 1 to the International Electrotechnical Commission’s standard Ultrasonics - Hydrophones - Part 3: Properties of Hydrophones for Ultrasonic Fields. This amendment, prepared by IEC Technical Committee 87 (Ultrasonics), refines and updates the measurement and reporting requirements related to the properties of hydrophones used for characterizing ultrasonic fields.
Hydrophones are key transducers for measuring and characterizing ultrasonic waves in diverse fields, including medical ultrasound, non-destructive testing, and acoustic research. This amendment focuses on improving the practical application and clarity of requirements regarding hydrophone sensitivity, temperature dependence, frequency response, and directional characteristics.
Key Topics
Sensitivity and Temperature Dependence
- Specification of the water temperature linked to stated sensitivity.
- Recommendation, rather than strict requirement, to provide temperature dependence over 19°C to 25°C.
- Clarification on how minor temperature differences during calibration and use may be accommodated within measurement uncertainty.
Frequency Response Reporting
- Encourages providing both list and graphical forms for frequency response data.
- Ensures more accessible and practical frequency response information across the hydrophone's usable bandwidth.
Directional Response Measurements
- Adjusted requirements for angular increments during directional response measurement, particularly for different frequency ranges (up to 20 MHz vs. higher frequencies).
- Acceptance of larger angular variation at frequencies above 20 MHz for practical reasons.
Modeling for Effective Hydrophone Size
- Preference for default rigid baffle piston model for consistency.
- Option to use alternative models if adequately justified, supporting advances in spatial averaging corrections.
- Practical notes on shape effects (e.g., elliptical, rectangular elements) due to electrode design and manufacturing.
Applications
IEC 62127-3:2022/AMD1:2026 enhances the reliability and repeatability of ultrasonic measurement processes by:
Medical Ultrasound Metrology
- Assists in evaluating the output and safety of medical ultrasound equipment by improving consistency when measuring ultrasonic pressure fields.
- Facilitates compliance with international regulatory expectations for device characterization.
Non-Destructive Testing (NDT)
- Supports accurate calibration and characterization of ultrasonic transducers used in material inspection and flaw detection.
Acoustic Research
- Enables the collection of higher-quality, comparable hydrophone data for research and development in ultrasonic sensing and signal processing.
Hydrophone Manufacturing and Calibration
- Offers clarified guidance to manufacturers and calibration laboratories for declaring hydrophone properties, especially concerning frequency and temperature effects.
- Promotes harmonization of data reporting methods, aiding customers in making informed device choices.
Related Standards
For comprehensive compliance and integration, reference the following associated IEC standards:
- IEC 62127-1: Ultrasonics - Hydrophones - Part 1: Measurement and characterization of medical ultrasonic fields up to 40 MHz.
- IEC 62127-2: Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields (updated reference included in this amendment).
- IEC 60601 Series: Medical electrical equipment standards, including requirements for ultrasound safety.
- ISO/IEC Guides and Directives: General guidelines for international standardization practices.
Practical Value
This amendment to IEC 62127-3 strengthens the metrological foundation required for accurate ultrasonic field measurement. By refining how hydrophone properties are determined, documented, and reported, it supports better reproducibility and cross-comparison of acoustic measurement results, crucial for regulatory compliance, device development, and scientific research.
Keywords: IEC 62127-3:2022/AMD1:2026, hydrophones, ultrasonic fields, hydrophone properties, temperature dependence, frequency response, directional response, calibration, ultrasonics standard, acoustic measurement, medical ultrasound, non-destructive testing.
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IEC 62127-3:2022/AMD1:2026 - Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields
IEC 62127-3:2022/AMD1:2026 - Amendement 1 - Ultrasons - Hydrophones - Partie 3: Propriétés des hydrophones pour les champs ultrasoniques
IEC 62127-3:2022/AMD1:2026 - Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields
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Frequently Asked Questions
IEC 62127-3:2022/AMD1:2026 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields". This standard covers: Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields
Amendment 1 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields
IEC 62127-3:2022/AMD1:2026 is classified under the following ICS (International Classification for Standards) categories: 17.140.50 - Electroacoustics. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 62127-3:2022/AMD1:2026 has the following relationships with other standards: It is inter standard links to IEC 62127-3:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
IEC 62127-3:2022/AMD1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
IEC 62127-3 ®
Edition 2.0 2026-02
INTERNATIONAL
STANDARD
AMENDMENT 1
Ultrasonics - Hydrophones -
Part 3: Properties of hydrophones for ultrasonic fields
ICS 17.140.50 ISBN 978-2-8327-1069-2
IEC 62127-3:2022-12/AMD1:2026-02(en)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
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International Standards for all electrical, electronic and related technologies.
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Ultrasonics - Hydrophones -
Part 3: Properties of hydrophones for ultrasonic fields
AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 62127-2:2022 has been prepared by IEC technical committee 87:
Ultrasonics.
The text of this Amendment is based on the following documents:
Draft Report on voting
87/897/CDV 87/914/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
___________
INTRODUCTION
The second edition of IEC 62127-3 was published in 2022. The application of the document has
revealed improvement potential with respect to the measurement requirements for directional
responses and regarding data evaluation requirements for effective hydrophone size
determination. This amendment addresses these items to ensure the practicality of the required
measurements as well as the generation of a common data base to support hydrophone spatial
averaging correction methods and the simplifying assumptions therein.
2 Normative references
Replace the IEC 62127-2 reference with the following new reference:
"IEC 62127-2, Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields"
5.3 Sensitivity
Replace the seventh paragraph starting "The temperature dependence of …" with
...
IEC 62127-3 ®
Edition 2.0 2026-02
NORME
INTERNATIONALE
AMENDEMENT 1
Ultrasons - Hydrophones -
Partie 3: Propriétés des hydrophones pour les champs ultrasoniques
ICS 17.140.50 ISBN 978-2-8327-1069-2
IEC 62127-3:2022-12/AMD1:2026-02(fr)
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
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CH-1211 Geneva 20 www.iec.ch
Switzerland
A propos de l'IEC
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COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Ultrasons - Hydrophones -
Partie 3: Propriétés des hydrophones pour les champs ultrasoniques
AMENDEMENT 1
AVANT-PROPOS
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L'Amendement 1 de l'IEC 62127-2:2022 a été préparé par le comité d'études 87 de l'IEC:
Ultrasons.
Le texte de cet Amendement est issu des documents suivants:
Projet Rapport de vote
87/897/CDV 87/914/RVC
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cet Amendement est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/publications/.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
___________
INTRODUCTION
La deuxième édition de l'IEC 62127-3 a été publiée en 2022. L'application du document a révélé
un potentiel d'amélioration en ce qui concerne les exigences de mesurage pour les réponses
directionnelles et en ce qui concerne les exigences d'évaluation des données pour la
détermination de la taille efficace de l'hydrophone . Cet Amendement aborde ces points afin
d'assurer l'aspect pratique des mesurages requis ainsi que la génération d'une base de
données commune pour soutenir les hydrophones méthodes de correction de la moyenne
spatiale et les hypothèses simplificatrices qui s'y rapportent.
2 Références normatives
Remplacer la référence IEC 62127-2 par la nouvelle référence suivante:
"IEC 62127-2, Ultrasons - Hydrophones - Partie 2: Étalonnage des champs ultrasoniques"
5.3 Sensibilité
Remplacer le septième alinéa commençant par "La dépendance de la sensibilité ." par le
nouvel alinéa suivant:
"La température particulière de l'e
...
IEC 62127-3 ®
Edition 2.0 2026-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Ultrasonics - Hydrophones -
Part 3: Properties of hydrophones for ultrasonic fields
Ultrasons - Hydrophones -
Partie 3: Propriétés des hydrophones pour les champs ultrasoniques
ICS 17.140.50 ISBN 978-2-8327-1069-2
IEC 62127-3:2022-12/AMD1:2026-02(en-fr)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.
replaced and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
Published détaille les nouvelles publications parues. dans 25 langues additionnelles. Egalement appelé
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: sales@iec.ch.
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Ultrasonics - Hydrophones -
Part 3: Properties of hydrophones for ultrasonic fields
AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 62127-2:2022 has been prepared by IEC technical committee 87:
Ultrasonics.
The text of this Amendment is based on the following documents:
Draft Report on voting
87/897/CDV 87/914/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
___________
INTRODUCTION
The second edition of IEC 62127-3 was published in 2022. The application of the document has
revealed improvement potential with respect to the measurement requirements for directional
responses and regarding data evaluation requirements for effective hydrophone size
determination. This amendment addresses these items to ensure the practicality of the required
measurements as well as the generation of a common data base to support hydrophone spatial
averaging correction methods and the simplifying assumptions therein.
2 Normative references
Replace the IEC 62127-2 reference with the following new reference:
"IEC 62127-2, Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields"
5.3 Sensitivity
Replace the seventh paragraph starting "The temperature dependence of …" with the following
new paragraph:
"The particular water temperature to which the stated sensitivity relates shall be given. The
temperature dependence of the sensitivity should be described. The hydrophone sensitivity
should be stated as a function of the water temperature, at least over the temperature range
19 °C to 25 °C, or the particular water temperature to which the stated sensitivity relates should
be stated together with the temperature coefficient of the sensitivity.
NOTE 4 The former requirement to state the temperature dependence has been modified to become a
recommendation for practical reasons. Though being of importance for some applications, the former general
requirement here posed disproportional measurement burden to conform with IEC 62127-3. As long as water
temperatures at calibration and measurement application differ by one or two degrees only, consideration of the
effect within an uncertainty component is reasonable [15],[16],[17]."
5.4.2 Frequency dependence
First paragraph:
Delete, in the first sentence, "either graphically or".
Delete, in the second sentence, "If it is given as a list of values or as discrete points in a graph,".
Add the following new sentence at the end of the paragraph:
"In addition to the list of values, a graphical representation of the data may be provided."
Third paragraph:
Delete "either graphically or".
Add the following new sentence at the end of the paragraph:
"In addition, a graphical representation of the data may be provided."
5.5.2 Determination of the directional response
In the third paragraph starting with "The angular increment …", add the following text after
"1 dB":
"for frequencies up to 20 MHz. At higher frequencies larger variation between adjacent points
may be accepted for practicability".
5.6.2 Model of directional response
First paragraph:
Delete, in the second sentence, "unless clear justification is provided for the choice of an
alternative model of directional response".
Add the following new sentence after the second sentence:
"Use of the default model also has the advantage of retaining a common data base, in particular
for spatial averaging applications. An alternative model of directional response can be applied
in addition if clear justification is provided."
Add, at the end of item a), the following note:
"NOTE 1 For nominally circular shaped membrane hydrophone active elements, effective receiving areas of
elliptical shape are frequently observed due to the impact of the electric leads during the spot-poling process [10].
The size data obtained for different directions (see 5.5.2) [18],[19] can then be averaged to obtain simplified circular
size data."
Add, at the end of item b), the following notes:
"NOTE 2 Formula (9) is correct for the two directions parallel to the rectangle sides only. It cannot be applied to
measurements around additional axes, for instance the diagonals.
NOTE 3 Membrane hydrophones with rectangular electrode design can actually provide rounded effective
elements due to the spot-poling process within fabrication [20]. In such cases, a similar effective hydrophone size
can be expected in directions parallel to the rectangle sides and the diagonals, and the use of the model for nominally
circular shaped hydrophones is appropriate."
Add, at the end of the subclause, the following paragraphs:
"Spatial averaging correction methods usually assume circular receiving elements and, possibly,
frequency-dependent effective hydrophone sizes, see IEC 62127-1 and [21]. Detailed
hydrophone-type-specific modelling of the receiving process within the sensing elements
aperture of the individual hydrophone type, however, is usually not considered within the
generalized spatial averaging compensation approaches. Usage of the default rigid baffle piston
model has been shown to provide usable effective size data for membrane, needle-type and
capsule-type hydrophones if the frequency dependence is included [20], [22].
Nevertheless, application of more hydrophone-type-specific modelling is useful to better
understand the frequency-dependent receiving characteristics and can support the selection of
a hydrophone type suitable for the actual measurement task."
Annex A (informative) Examples of information on hydrophone properties
A.3 Sensitivity and frequency response
Replace, in the first paragraph, "The data are displayed in Figure A.1" by "The data are
displayed in Table A.2 and in Figure A.1".
Replace, in the second paragraph, "The data are displayed in Figure A.2" by "The data are
displayed in Table A.3 and in Figure A.2".
Add, after NOTE 1, the following new table:
Table A.2 – Frequency response of 0,2 mm needle hydrophone
in the range 1 MHz to 40 MHz
Frequency Sensitivity
MHz mV/MPa
1 41,0
2 62,2
3 73,4
4 70,8
5 62,5
6 63,2
7 64,4
8 56,5
9 54,2
10 53,8
11 52,5
12 58,4
13 56,2
14 55,7
15 56,0
16 56,1
17 57,0
18 57,5
19 58,0
20 58,3
21 58,2
22 59,0
23 60,0
24 60,1
25 58,6
26 59,1
27 58,9
Frequency Sensitivity
MHz mV/MPa
28 57,8
29 57,5
30 57,0
31 58,0
32 58,0
33 56,8
34 55,9
35 53,1
36 50,3
37 48,8
38 47,0
39 44,7
40 43,0
Add, after Figure A.1, the following new table:
Table A.3 – Frequency response of 0,2 mm needle hydrophone
in the range 100 kHz to 1 MHz
Frequency Sensitivity
MHz mV/MPa
0,1 23
0,15 24
0,2 24
0,25 25
0,3 25
0,35 25
0,4 26
0,45 26
0,5 27
0,55 27
0,6 27
0,65 28
0,7 28
0,75 29
0,8 29
0,85 30
0,9 30
0,95 31
1,0 38
Annex B (informative) Rationale
B.2 Changes to the determination of directional response
Add, in the second paragraph, after "This document requires an angular increment to be
selected that ensures no more than 1 dB change between adjacent points", the following text:
"for frequencies up to 20 MHz. At higher frequencies larger variation between adjacent points
may be accepted for practicability [20]. In most cases, the high-frequency asymptotic effective
size value is expected to already be reached at 20 MHz."
Bibliography
Add, at the end of the list, the following new references:
[15] PRESTON, RC., ROBINSON, SP., ZEQIRI, B., ESWARD, TJ., GELAT, PN. and
LEE, ND., Primary calibration of membrane hydrophones in the frequency range 0.5 MHz
to
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