EN IEC 60565-1:2020

Underwater acoustics - Hydrophones - Calibration of hydrophones - Part 1: Procedures for free-field calibration of hydrophones

IEC 60565-1:2020 specifies methods and procedures for free-field calibration of hydrophones, as well as individual electroacoustic transducers that can be used as hydrophones (receivers) and/or projectors (source transducers). Two general types of calibration are covered within this document: absolute calibration using the method of three-transducer spherical-wave reciprocity, and relative calibration by comparison with a reference device which has already been the subject of an absolute calibration. The maximum frequency range of the methods specified in this document is from 200 Hz to 1 MHz. The lowest acoustic frequency of application will depend on a number of factors, and will typically be in the range 200 Hz to 5 kHz depending mainly on the dimensions of the chosen test facility, The highest frequency of application for the methods described here is 1 MHz. Procedures for pressure hydrophone calibration at low frequencies can be found in IEC 60565 2 [1] . Procedures for hydrophone calibration at acoustic frequencies greater than 1 MHz are covered by IEC 62127-2 [2]. Excluded from the scope of this document are low-frequency pressure calibrations of hydrophones, which are described in IEC 60565-2 [1]. Also excluded are calibrations of digital hydrophones and systems, calibration of marine autonomous acoustic recorders, calibration of acoustic vector sensors such as particle velocity sensors and pressure gradient hydrophones, calibration of passive sonar arrays consisting of multiple hydrophones, and calibration of active sonar arrays consisting of projectors and hydrophones. This document presents a description of the requirements for free-field calibration in terms of test facility, equipment and instrumentation, signal processing, and frequency limitations. A description of achievable uncertainty and rules for the presentation of the calibration data are provided. Also included are informative annexes that provide additional guidance on • measurement of directional response of a hydrophone or projector, • measurement of electrical impedance of hydrophones and projectors, • electrical loading corrections, • acoustic far-field criteria in underwater acoustic calibration, • pulsed techniques in free-field calibrations, • assessment of uncertainty in the free-field calibration of hydrophones and projectors, • derivation of the formulae for three-transducer spherical-wave reciprocity calibrations, • calibration using travelling-wave tubes, • calibration of hydrophones using optical interferometry, and • calibrations in reverberant water tanks using continuous signals. IEC 60565-1:2020 together with IEC 60565-2:2019, cancels and replaces the second edition of IEC 60565 published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: 1) removal of all descriptions of methods for pressure calibrations of hydrophones – these are now included in Part 2; 2) removal of the derivations of formulae for free-field reciprocity calibration (both amplitude sensitivity and phase sensitivity) and placement of these into an informative annex; 3) inclusion within the scope of the calibration of the transmitting response of individual source transducers and hydrophones (but not sonar arrays); 4) re-ordering of the sections within the document such that the more general procedures for calibration such as guidance on obtaining conditions of acoustic free-field, far-field, and stea

Wasserschall - Hydrophone - Kalibrierung von Hydrophonen - Teil 1: Verfahren für die Freifeldkalibrierung von Hydrophonen

Acoustique sous-marine - Hydrophones - Étalonnage des hydrophones - Partie 1: Procédures d'étalonnage en champ libre des hydrophones

L'IEC 60565-1:2020 spécifie les méthodes et procédures d'étalonnage en champ libre des hydrophones, ainsi que des transducteurs électroacoustiques individuels qui peuvent être utilisés comme hydrophones (récepteurs) et/ou projecteurs (transducteurs sources). Deux grands types d'étalonnage sont couverts par le présent document: l'étalonnage absolu utilisant la méthode par réciprocité d’onde sphérique à trois transducteurs, et l'étalonnage relatif par comparaison avec un dispositif de référence qui a déjà fait l'objet d'un étalonnage absolu. La plage de fréquences maximale des méthodes spécifiées dans le présent document est comprise entre 200 Hz et 1 MHz. La fréquence acoustique la plus faible de l'application dépend d'un certain nombre de facteurs, et est en général comprise entre 200 Hz et 5 kHz selon les dimensions de l'installation d'essai choisie. La fréquence la plus élevée de l'application pour les méthodes décrites ici est de 1 MHz. Les procédures d'étalonnage de l'hydrophone à pression aux basses fréquences peuvent être consultées dans l'IEC 60565-2 [1] . Les procédures d'étalonnage de l'hydrophone aux fréquences acoustiques supérieures à 1 MHz sont couvertes par l'IEC 62127-2 [2]. Les étalonnages en pression basse fréquence des hydrophones sont exclus du domaine d'application du présent document. Ils sont décrits dans l'IEC 60565-2 [1]. Sont également exclus les étalonnages des hydrophones et systèmes numériques, des enregistreurs acoustiques marins autonomes, des capteurs vectoriels acoustiques (capteurs de vitesse de particules et hydrophones à gradient de pression, par exemple), des réseaux sonars passifs composés de plusieurs hydrophones et des réseaux sonars actifs composés de projecteurs et d'hydrophones. Le présent document donne une description des exigences relatives à l'étalonnage en champ libre en ce qui concerne l'installation, le matériel et les appareils d'essai, le traitement du signal et les limites de fréquence. Une description de l'incertitude pouvant être obtenue et les règles de présentation des données d'étalonnage sont fournies. Sont également incluses des annexes informatives donnant des recommandations supplémentaires • relatives au mesurage de la réponse directionnelle d'un hydrophone ou d'un projecteur, • relatives au mesurage de l'impédance électrique des hydrophones et des projecteurs, • sur les corrections de charge électrique, • relatives aux critères de champ acoustique lointain dans l'étalonnage acoustique sous-marin, • relatives aux techniques par impulsions dans les étalonnages en champ libre, • relatives à l'évaluation de l'incertitude dans l'étalonnage en champ libre des hydrophones et des projecteurs, • sur la déduction des formules pour les étalonnages par réciprocité d'onde sphérique à trois transducteurs, • relatives à l'étalonnage à l'aide de tubes à ondes progressives, • relatives à l'étalonnage des hydrophones par interférométrie optique, et • relatives à l'étalonnage dans des cuves d'eau réverbérées à l'aide de signaux continus. L'IEC 60565-1:2020 avec l’IEC 60565-2:2019, annule et remplace la deuxième édition de l’IEC 60565 parue en 2006. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: 1) suppression de toutes les descriptions des mét

Podvodna akustika - Hidrofoni - Kalibracija hidrofonov - 1. del: Postopki za kalibracijo hidrofonov v odprtem prostoru (IEC 60565-1:2020)

General Information

• Status: Published
• Publication Date: 25-Jun-2020
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: CLC/SR 87 - CLC/SR 87
• Drafting Committee: IEC/TC 87 - IEC_TC_87
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 26-Jun-2020
• Completion Date: 26-Jun-2020
• Ref Project: SIST EN IEC 60565-1:2020 - Underwater acoustics - Hydrophones - Calibration of hydrophones - Part 1: Procedures for free-field calibration of hydrophones (IEC 60565-1:2020)

Relations

• Replaces: EN 60565:2007 - Underwater acoustics - Hydrophones - Calibration in the frequency range 0,01 Hz to 1 MHz
• Effective Date: 04-Jun-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2020
Nadomešča:
SIST EN 60565:2008
Podvodna akustika - Hidrofoni - Kalibracija hidrofonov - 1. del: Postopki za
kalibracijo hidrofonov v odprtem prostoru (IEC 60565-1:2020)
Underwater acoustics - Hydrophones - Calibration of hydrophones - Part 1: Procedures
for free-field calibration of hydrophones (IEC 60565-1:2020)
Wasserschall - Hydrophone - Kalibrierung von Hydrophonen - Teil 1: Verfahren für die
Freifeldkalibrierung von Hydrophonen (IEC 60565-1:2020)
Acoustique sous-marine - Hydrophones - Étalonnage des hydrophones - Partie 1:
Procédures d'étalonnage en champ libre des hydrophones (IEC 60565-1:2020)
Ta slovenski standard je istoveten z: EN IEC 60565-1:2020
ICS:
17.140.50 Elektroakustika Electroacoustics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60565-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 17.140.50 Supersedes EN 60565:2007 (partially)
and all of its amendments and corrigenda (if any)
English Version
Underwater acoustics - Hydrophones - Calibration of
hydrophones - Part 1: Procedures for free-field calibration of
hydrophones
(IEC 60565-1:2020)
Acoustique sous-marine - Hydrophones - Étalonnage des Wasserschall - Hydrophone - Kalibrierung von
hydrophones - Partie 1: Procédures d'étalonnage en champ Hydrophonen - Teil 1: Verfahren für die Freifeldkalibrierung
libre des hydrophones von Hydrophonen
(IEC 60565-1:2020) (IEC 60565-1:2020)
This European Standard was approved by CENELEC on 2020-05-29. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60565-1:2020 E

European foreword
The text of document 87/708/CDV, future edition 1 of IEC 60565-1, prepared by IEC/TC 87
"Ultrasonics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-03-01
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-05-29
document have to be withdrawn
This document supersedes (partially) EN 60565:2007 and all of its amendments and corrigenda (if
any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60565-1:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60565-2 NOTE Harmonized as EN IEC 60565-2
IEC 62127-2 NOTE Harmonized as EN 62127-2

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-801 - International Electrotechnical Vocabulary - - -
Chapter 801: Acoustics and electroacoustics
IEC 60500 2017 Underwater acoustics - Hydrophones - EN 60500 2017
Properties of hydrophones in the frequency
range 1 Hz to 500 kHz
IEC 60565-1 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Underwater acoustics – Hydrophones – Calibration of hydrophones –

Part 1: Procedures for free-field calibration of hydrophones

Acoustique sous-marine – Hydrophones – Étalonnage des hydrophones –

Partie 1: Procédures d'étalonnage en champ libre des hydrophones

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-8039-3

– 2 – IEC 60565-1:2020 © IEC 2020
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 11
4 Symbols and abbreviated terms . 16
5 General procedures for calibration . 17
5.1 General alibration requirements . 17
5.1.1 Types of calibration . 17
5.1.2 Acoustic field requirements . 18
5.2 Acoustic free-field requirements . 18
5.2.1 Continuous signals . 18
5.2.2 Time-limited signals . 18
5.3 Acoustic far-field requirements . 18
5.4 Requirements for steady-state conditions. 19
5.5 Equipment requirements . 20
5.5.1 Calibration facility . 20
5.5.2 Instrumentation . 20
5.6 Positioning and alignment . 22
5.6.1 Coordinate system . 22
5.6.2 Reference direction . 22
5.6.3 Transducer mounting and support . 22
5.6.4 Alignment . 23
5.6.5 Separation distance . 23
5.7 Representation of the frequency response . 23
5.8 Frequency limitations . 24
5.8.1 High-frequency limit . 24
5.8.2 Low-frequency limit . 24
5.9 Checks for acoustic interference . 24
6 Electrical measurements. 25
6.1 Signal type . 25
6.2 Electrical earthing . 25
6.3 Measurement of hydrophone output voltage . 25
6.3.1 General . 25
6.3.2 Signal analysis . 26
6.3.3 Electrical loading by measuring instruments . 26
6.3.4 Electrical loading by extension cables . 26
6.3.5 Electrical noise . 26
6.3.6 Cross-talk . 27
6.3.7 Integral preamplifiers . 27
6.4 Measurement of projector drive current . 27
6.4.1 Instrumentation . 27
6.4.2 Signal analysis . 27
6.5 Measurement of projector drive voltage . 28
6.5.1 Instrumentation . 28
6.5.2 Signal analysis . 28

IEC 60565-1:2020 © IEC 2020 – 3 –
7 Preparation and conditioning of transducers . 28
7.1 Soaking . 28
7.2 Wetting . 28
7.3 Extending the hydrophone cable . 29
7.4 Environmental conditions (temperature and depth) . 29
8 Free-field three-transducer spherical-wave reciprocity calibration . 29
8.1 General principle . 29
8.2 Calibration to determine sensitivity modulus (without phase) . 30
8.2.1 Acoustic field requirements . 30
8.2.2 Separation distance . 30
8.2.3 Transducer preparation, mounting and alignment . 31
8.2.4 Signal type . 31
8.2.5 Measurement of electrical transfer impedance . 31
8.2.6 Calculation of the receive sensitivities . 31
8.2.7 Calculation of the transmit sensitivities . 32
8.2.8 Repeatability . 32
8.2.9 Verification and checks . 32
8.2.10 Uncertainty . 34
8.3 Calibration to determine phase of the hydrophone sensitivity . 34
8.3.1 General principle . 34
8.3.2 Transducer preparation .
...