SIST EN 60565:2008

SLOVENSKI STANDARD
SIST EN 60565:2008
01-januar-2008
3RGYRGQDDNXVWLND+LGURIRQL.DOLEUDFLMDYIUHNYHQþQHPREPRþMXRG+]GR
0+],(&
Underwater acoustics - Hydrophones - Calibration in the frequency range 0,01 Hz to 1
MHz (IEC 60565:2006)
Wasserschall - Hydrophone - Kalibrierung im Frequenzbereich von 0,01 Hz bis 1 MHz
(IEC 60565:2006)
Acoustique sous-marine - Hydrophones - Etalonnage dans la bande de fréquences de
0,01 Hz a 1 MHz (IEC 60565:2006)
Ta slovenski standard je istoveten z: EN 60565:2007
ICS:
17.140.50 Elektroakustika Electroacoustics
SIST EN 60565:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 60565

NORME EUROPÉENNE
January 2007
EUROPÄISCHE NORM

ICS 17.140.50


English version


Underwater acoustics -
Hydrophones -
Calibration in the frequency range 0,01 Hz to 1 MHz
(IEC 60565:2006)


Acoustique sous-marine -  Wasserschall -
Hydrophones - Hydrophone -
Etalonnage dans la bande de fréquences Kalibrierung im Frequenzbereich
de 0,01 Hz à 1 MHz von 0,01 Hz bis 1 MHz
(CEI 60565:2006) (IEC 60565:2006)




This European Standard was approved by CENELEC on 2006-12-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60565:2007 E

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EN 60565:2007 - 2 -
Foreword
The text of document 87/357/FDIS, future edition 2 of IEC 60565, prepared by IEC TC 87, Ultrasonics,
was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60565 on
2006-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-12-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60565:2006 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 60565:2007
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

1)
IEC 60050-801 - International Electrotechnical Vocabulary - -
(IEV)
Chapter 801: Acoustics and electroacoustics


IEC 60500 1974 IEC standard hydrophone - -


IEC 60866 1987 Characteristics and calibration of - -
hydrophones for operation in the frequency
range 0,5 MHz to 15 MHz




1)
Undated reference.

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NORME CEI
INTERNATIONALE
IEC



60565
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

2006-11


Acoustique sous-marine –
Hydrophones –
Étalonnage dans la bande de
fréquences de 0,01 Hz à 1 MHz

Underwater acoustics –
Hydrophones –
Calibration in the frequency
range 0,01 Hz to 1 MHz
© IEC 2006 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
XC
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60565 © IEC:2006 – 3 –
CONTENTS
FOREWORD.9

1 Scope.13
2 Normative references .13
3 Terms and definitions .13
4 Symbols and abbreviated terms.25
5 Procedures for calibrations.29
5.1 Principles .29
5.2 Field limitations .31
5.3 Schematic survey of procedures.31
5.4 Reporting of results .31
5.5 Recalibration periods.33
5.6 Temperature and pressure considerations for calibration.33
6 Preparation of transducers .33
6.1 Wetting.33
6.2 Hydrophone support .33
6.3 Influence of cable .33
7 Electrical measurements .35
7.1 Signal type .35
7.2 Earthing .35
7.3 Measurement of hydrophone output voltage .35
7.4 Measurement of projector current.37
7.5 Measurement of transfer impedance.39
8 Free-field reciprocity calibration.39
8.1 General principle .39
8.2 Theory.41
8.3 Separation distance.51
8.4 Minimum distance from transducers to boundary surface.51
8.5 Frequency limitation .51
8.6 Measurements and checks .53
8.7 Uncertainty.59
9 Free-field calibration by comparison .59
9.1 Principle.59
9.2 Comparison with a standard hydrophone.59
9.3 Calibration with a calibrated projector.61
10 Calibration by hydrostatic excitation .63
10.1 Principle.63
10.2 Determination of equivalent pressure .63
10.3 Measurement of the sensitivity of hydrophones .71
10.4 Design of vibration system .73
10.5 Uncertainty.75
10.6 Alternative method for hydrostatic excitation .75
11 Calibration by piezoelectric compensation .75
11.1 Principle.75
11.2 Procedure .77

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60565 © IEC:2006 – 5 –
11.3 Design of the calibration chamber .81
11.4 Practical limitations of the piezoelectric compensation method .85
11.5 Uncertainty.85
12 Acoustic coupler reciprocity calibration.85
12.1 Principle……….85
12.2 Procedure .85
12.3 Theory……….87
12.4 Acoustic compliance.89
12.5 High-frequency limit .89
12.6 Low-frequency limit .89
12.7 Measurement .89
12.8 Uncertainty.91
12.9 Limitations.91
12.10 Acoustic-coupler calibration using a reference coupler with two reciprocal
transducers and an auxiliary coupler with the same two transducers and a
hydrophone to be calibrated .91
12.11 Acoustic-coupler calibration using a reference coupler with two reciprocal
transducers and an auxiliary coupler with the same two transducers, a
hydrophone to be calibrated, and a sound source.95
12.12 Acoustic-coupler calibration using a coupler, a reciprocal transducer, a
projector, a hydrophone to be calibrated, and a subsidiary body of known
compliance.99
13 Calibration with a pistonphone.103
13.1 Principle……….103
13.2 Procedure .103
13.3 Limitations.109
13.4 Uncertainty.111
14 Calibration with a vibrating column .111
14.1 Principle……….111
14.2 Procedure .113
14.3 Expression for the pressure.115
14.4 Determination of the sensitivity.115
14.5 Conditions of measurement .119
14.6 Uncertainty.121

Annex A (informative) Directional response of a hydrophone .123
Annex B (informative) Electrical loading corrections.127
Annex C (informative) Pulsed techniques in free-field calibrations .131
Annex D (informative) Assessment of uncertainty in the calibration of hydrophones.149
Annex E (informative) Equivalent circuit of the excitation system for calibration with a
vibrating column .157

Bibliography.159

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60565 © IEC:2006 – 7 –

Figure 1 – Left-hand co-ordinate system .15
Figure 2 – Measurement framework for supporting in-line the three transducers: a
projector P, a reciprocal transducer T, and a hydrophone H to be calibrated.49
Figure 3 – Diagram of the method of hydrostatic excitation. .65
Figure 4 – Schematic drawing of the measuring system .77
Figure 5 – Diagram of the chamber for high-frequency.83
Figure 6 – Reciprocity coupler with three transducers; a projector P , a reciprocal
transducer T , and a hydrophone H to be calibrated.87
Figure 7 – Reference coupler with two transducers: a projector P and a reciprocal
transducer T .93
Figure 8 – Auxiliary coupler with three transducers: a projector P , a reciprocal
transducer T , and a hydrophone H to be calibrated.93
Figure 9 – Auxiliary coupler with four transducers; a projector P , a reciprocal
transducer T , a sound source S , and a hydrophone H to be calibrated.97
Figure 10 – Schematic drawing of the measuring system. .103
Figure 11 – Pistonphone .111
Figure 12 – Vibrating column .113
Figure C.1 – Schematic diagram of a projector and receiver in a water tank showing
the main sources of reflections .135
Figure C.2 – Echo arrival time in a 6 m × 6 m × 5 m tank with optimally placed
transducers.137
Figure C.3 – Hydrophone signals for a pair of spherical transducers [projector: 18 kHz
resonance frequency, Q factor of 3,5; hydrophone: 350 kHz resonance frequency;
drive frequency: 2 kHz (left) and 18 kHz (right)] .139
Figure E.1 – Simplified equivalent circuit of the vibrating column .157

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60565 © IEC:2006 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

UNDERWATER ACOUSTICS – HYDROPHONES –
CALIBRATION IN THE FREQUENCY RANGE
0,01 Hz TO 1 MHz


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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60565 has been prepared by IEC technical committee 87:
Ultrasonics.
This second edition cancels and replaces the first edition published in 1977 and its first
supplement IEC 60565A (1980). This edition constitutes a technical revision. The significant
technical changes with respect to the previous edition are as follows:
– updating of procedures to reflect the use of digital acquisition and signal processing
techniques as opposed to the analogue techniques described in the first edition;
– inclusion of more detailed information regarding the preparation of hydrophones for
measurement, and the influences of environmental conditions on hydrophone calibration;
– revision of procedures for magnitude calibration of hydrophone response by the method of
three-transducer spherical-wave reciprocity;
– inclusion of procedures for phase calibration into the method of three-transducer
spherical-wave reciprocity;

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60565 © IEC:2006 – 11 –
– revision of procedures for calibration of hydrophones by the comparison methods;
– inclusion of procedures for low frequency hydrophone calibration utilising the method of
hydrostatic excitation;
– revision of the procedures for low frequency hydrophone calibration utilising the method of
piezoelectric compensation;
– inclusion of procedures for low frequency hydrophone calibration utilising the method of
coupler reciprocity;
– revision of the procedures for low frequency hydrophone calibration utilising the
pistonphone method;
– revision of procedures for low frequency hydrophone calibration utilising the method of
vibrating column (previously issued as a supplement to the standard);
– deletion of Appendix A of first edition (transfer impedance by substitution method) since
method no longer used;
– deletion of Appendix B of first edition (transfer impedance by direct read-out method)
since method no longer used;
– retention of Appendix C of first edition, but now substantially updated and included as
Annex C (informative);
– retention of Appendix D of first edition, now included as Annex A (informative);
– addition of new Annex B describing methods for accounting for electrical loading of
hydrophones by pre-amplifiers;
– addition of new Annex D describing the assessment of uncertainty in free-field hydrophone
calibrations;
– addition of new Annex E describing an equivalent electrical circuit of the excitation system
for calibration with a vibrating column.
The text of this standard is based on the following documents:
FDIS Report on voting
87/357/FDIS 87/360/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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60565 © IEC:2006 – 13 –
UNDERWATER ACOUSTICS – HYDROPHONES –
CALIBRATION IN THE FREQUENCY RANGE
0,01 Hz TO 1 MHz



1 Scope
This International Standard specifies methods for calibration of hydrophones or reversible
transducers when used as a hydrophone, particularly in the frequency range from 0,01 Hz to
1 MHz. Rules for the presentation of the calibration data are established.
2 Normative references
The following referenced data are indispensable for the application 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.
IEC 60050-801, International Electrotechnical Vocabulary - Chapter 801: Acoustics and
electroacoustics
IEC 60500:1974, IEC Standard hydrophone
IEC 60866:1987, Characteristics and calibration of hydrophones for operation in the
frequency range 0,5 MHz to 15 MHz
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
angular deviation loss
sensitivity level of the transducer on the principal axis minus the sensitivity level of the
transducer for a specified direction
[IEV 801-25-69]
3.2
co-ordinate system
system used to designate the directivity pattern of the transducer

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60565 © IEC:2006 – 15 –

+Z
0
+X
+Y
IEC  1994/06

Figure 1 – Left-hand co-ordinate system
Line transducer: central line of symmetry along the Z-axis;
Dipole transducer: both components equidistant from the origin, along the +Z and –Z axis;
Piston transducer: piston plane in ZOY-plane; principal axis along X-axis.
NOTE 1 The terms ’horizontal directivity pattern’ and ’vertical directivity pattern’ are often used for representation
of directivity in the XY- and XZ- (or YZ-) planes respectively.
1
NOTE 2 See Annex A, [1] , [2].
3.3
coupler
apparatus comprising a rigid fluid-filled chamber of small dimensions into which transducers
and hydrophones can be inserted
3.4
diffraction factor
ratio of the average pressure over the part of the hydrophone designed to receive sound to
the free-field sound pressure that would exist at the reference centre of the hydrophone
3.5
directional response
description, generally presented graphically, of the response of an electro-acoustic
transducer, as a function of the direction of propagation of the radiated or incident sound in a
specified plane through the reference centre and at a specified frequency
NOTE See Annex A.
3.6
dynamic range
ratio of the maximum free field sound pressure that produces an undistorted hydrophone
output to the equivalent noise pressure at the hydrophone
3.7
electrical impedance of a transducer
complex ratio of the instantaneous voltage applied across the electrical terminals of a
transducer at a given frequency, to the resulting instantaneous current
NOTE 1 The unit is the ohm, Ω.
NOTE 2 Because the electrical impedance depends on the field conditions, the hydrostatic pressure, water
temperature and the length of the cable attached to the transducer, these parameters, as well as the frequency and
the electrical terminals where the electrical impedance is measured should be specified.
___________
1
Numbers in square brackets refer to the bibliography

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60565 © IEC:2006 – 17 –
3.8
electrical terminals of a reciprocal transducer
terminals across which the open circuit hydrophone voltage , as well as the projector current
are measured
NOTE If the transducer is immersed in water, the electrical terminal with the lowest electrical impedance with
respect to water is called the ’low terminal’. Consequently, the other electrical terminal is called the ‘high terminal’.
3.9
electrical transfer impedance magnitude
magnitude of the electrical transfer impedance of a transducer pair
NOTE The unit is the ohm, Ω.
3.10
electrical transfer impedance of a transducer pair
complex ratio of the open circuit instantaneous voltage U across the hydrophone electrical
H
terminals to the instantaneous current I through the projector, if projector and hydrophone
P
are mounted in a free field with their principal axes in line and directed towards each other
U
H
NOTE 1 Z = (1)
PH
I
P
NOTE 2 The unit is the ohm, Ω.
NOTE 3 The electrical transfer impedance is a complex quantity. It has both real and imaginary components and
can be represented as a magn
...