EN 61161:2013

Ultrasonics - Power measurement - Radiation force balances and performance requirements

IEC 61161:2013 specifies a method of determining the total emitted acoustic power of ultrasonic transducers based on the use of a radiation force balance; establishes general principles for the use of radiation force balances in which an obstacle (target) intercepts the sound field to be measured; establishes limitations of the radiation force method related to cavitation and temperature rise; establishes quantitative limitations of the radiation force method in relation to diverging and focused beams; provides information on estimating the acoustic power for diverging and focused beams using the radiation force method; and provides information on assessment of overall measurement uncertainties. This International Standard is applicable to the measurement of ultrasonic power up to 1 W based on the use of a radiation force balance in the frequency range from 0,5 MHz to 25 MHz; the measurement of ultrasonic power up to 20 W based on the use of a radiation force balance in the frequency range 0,75 MHz to 5 MHz; the measurement of total ultrasonic power in well-collimated, diverging and focused ultrasonic fields; and to the use of radiation force balances of the gravimetric type or force feedback type. This third edition cancels and replaces the second edition published in 2006. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - whereas the second edition tacitly dealt with circular transducers only, the present edition as far as possible deals with both circular and rectangular transducers, including a number of symbols for rectangular transducers; - attention is paid to focused cases and the influence of scanning has been added; - the method of calibrating the radiation force balance now depends on whether the set-up is used as a primary or as secondary measurement tool; - and Annex B (basic formulae) has been updated and in Annex C the buoyancy change method is mentioned (see also future IEC 62555).

Ultraschall - Leistungsmessung - Schallfeldkraft-Waagen und Anforderungen an ihre Funktionseigenschaften

Ultrasons - Mesurage de puissance - Balances de forces de rayonnement et exigences de fonctionnement

La CEI 61161:2013 spécifie une méthode pour déterminer la puissance acoustique totale émise par des transducteurs ultrasonores, basée sur l'usage d'une balance de forces de rayonnement; établit les principes généraux pour utiliser les balances de forces de rayonnement dans lesquelles un obstacle dénommé cible intercepte le champ acoustique à mesurer; établit des limitations de la méthode de forces de rayonnement relatives à la cavitation et à l'élévation de la température; établit des limitations quantitatives de la méthode de forces de rayonnement par rapport aux faisceaux divergents et focalisés; fournit des informations concernant l'évaluation de la puissance acoustique pour les faisceaux divergents et focalisés par la méthode de la force de rayonnement; et fournit des informations concernant l'évaluation des incertitudes de mesure globales. La présente Norme internationale est applicable au mesurage de la puissance ultrasonore jusqu'à 1 W par utilisation d'une balance de forces de rayonnement dans la plage de fréquences de 0,5 MHz à 25 MHz; au mesurage de la puissance ultrasonore jusqu'à 20 W par utilisation d'une balance de forces de rayonnement dans la plage de fréquences de 0,75 MHz à 5 MHz; au mesurage de la puissance ultrasonore totale de transducteurs dans des champs ultrasonores possédant une bonne collimation, divergents et focalisés; et à l'utilisation de balances de forces de rayonnement de type gravimétrique ou à retour de force. Cette troisième édition annule et remplace la deuxième édition publiée en 2006. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - alors que la deuxième édition a implicitement traité des transducteurs circulaires uniquement, la présente édition traite dans la mesure du possible des transducteurs circulaires et rectangulaires et inclut également un certain nombre de symboles destinés aux transducteurs rectangulaires; - une plus grande d'attention est accordée aux cas focalisés et l'influence du balayage a été ajoutée; - la méthode d'étalonnage de la balance de forces de rayonnement dépend désormais de l'utilisation ou non de la configuration comme outil de mesure primaire ou secondaire; - et l'Annexe B (formules fondamentales) a été actualisée et l'Annexe C fait mention de la méthode de changement de flottabilité (voir aussi la future CEI 62555).

Ultrazvok - Močnostne meritve - Ravnotežje sevalnih jakosti in tehnične zahteve

Ta mednarodni standard:
• določa metodo za določanje skupne oddane akustične moči ultrazvočnih pretvornikov glede na uporabo ravnotežja sil sevanja;
• uvaja splošna načela za uporabo ravnotežij sil sevanja, pri katerih ovira (tarča) prestreže zvočno polje, ki je predmet meritve;
• uvaja omejitve metode sil sevanja v povezavi s kavitacijo in dvigom temperature;
• uvaja kvantitativne omejitve metode sil sevanja v povezavi z razpršenimi in usmerjenimi žarki;
• ponuja informacije o oceni akustične moči za razpršene in usmerjene žarke s pomočjo metode sil sevanja;
• ponuja informacije o ocenjevanju splošnih merilnih negotovosti.
Ta mednarodni standard se uporablja za:
• merjenje ultrazvočne moči do 1 W na podlagi uporabe ravnotežja sil sevanja v frekvenčnem razponu od 0,5 MHz do 25 MHz;
• merjenje ultrazvočne moči do 20 W na podlagi uporabe ravnotežja sil sevanja v frekvenčnem razponu od 0,75 MHz do 5 MHz;
• merjenje skupne ultrazvočne moči v dobro naravnanih, razpršenih in usmerjenih ultrazvočnih poljih;
• uporabo ravnotežij sil sevanja gravimetrične vrste ali vrste ponovne uporabe sile. (Glejte tudi točko A.1).
OPOMBA 1: Usmerjeni žarek se steka v predgoriščnem območju in razprši za goriščem.
OPOMBA 2: Merjenje ultrazvočne moči v območju terapevtske ultrazvočne visoke intenzivnosti (HITU), to je nad 1 W ali 20 W, je obravnavano v nadaljnjem IEC 62555.

General Information

• Status: Published
• Publication Date: 11-Apr-2013
• Withdrawal Date: 05-Mar-2016
• 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: 12-Apr-2013
• Completion Date: 12-Apr-2013
• Ref Project: SIST EN 61161:2013 - Ultrasonics - Power measurement - Radiation force balances and performance requirements

Relations

• Replaces: EN 61161:2007 - Ultrasonics - Power measurement - Radiation force balances and performance requirements
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2013
1DGRPHãþD
SIST EN 61161:2008
8OWUD]YRN0RþQRVWQHPHULWYH5DYQRWHåMHVHYDOQLKMDNRVWLLQWHKQLþQH]DKWHYH
Ultrasonics - Power measurement - Radiation force balances and performance
requirements
Ultraschall - Leistungsmessung - Schallfeldkraft-Waagen und Anforderungen an ihre
Funktionseigenschaften
Ultrasons - Mesurage de puissance - Balances de forces de rayonnement et exigences
de fonctionnement
Ta slovenski standard je istoveten z: EN 61161:2013
ICS:
17.140.50 Elektroakustika Electroacoustics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61161
NORME EUROPÉENNE
April 2013
EUROPÄISCHE NORM
ICS 17.140.50 Supersedes EN 61161:2007

English version
Ultrasonics -
Power measurement -
Radiation force balances and performance requirements
(IEC 61161:2013)
Ultrasons - Mesurage de puissance -  Ultraschall - Leistungsmessung -
Balances de forces de rayonnement Schallfeldkraft-Waagen
et exigences de fonctionnement und Anforderungen an ihre
(CEI 61161:2013) Funktionseigenschaften
(IEC 61161:2013)
This European Standard was approved by CENELEC on 2013-03-06. 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, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61161:2013 E
Foreword
The text of document 87/520/FDIS, future edition 3 of IEC 61161, prepared by IEC/TC 87 "Ultrasonics"
was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61161:2013.

The following dates are fixed:
(dop) 2013-12-06
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-03-06
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61161:2007.

– whereas the second edition tacitly dealt with circular transducers only, the present edition as far
as possible deals with both circular and rectangular transducers, Including a number of symbols
for rectangular transducers;
– attention is paid to focused cases and the influence of scanning has been added;
– the method of calibrating the radiation force balance now depends on whether the set-up is used
as a primary or as secondary measurement tool;
– Annex B (basic formulae) has been updated and in Annex C the buoyancy change method is
mentioned (see also future EN 62555).

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61161:2013 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 60601-2-5 NOTE Harmonised as EN 60601-2-5.
IEC 61157 NOTE Harmonised as EN 61157.
IEC 61846:1998 NOTE Harmonised as EN 61846:1998 (not modified).
IEC 62127-1 NOTE Harmonised as EN 62127-1.
IEC 62127-2 NOTE Harmonised as EN 62127-2.
IEC 62127-3 NOTE Harmonised as EN 62127-3.
1) 1)
IEC 62555 NOTE Harmonised as EN 62555 .

1)
At draft stage.
- 3 - EN 61161:2013
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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

IEC 61689 - Ultrasonics - Physiotherapy systems - Field EN 61689 -
specifications and methods of measurement
in the frequency range 0,5 MHz to 5 MHz

IEC 61161 ®
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ultrasonics – Power measurement – Radiation force balances and performance

requirements
Ultrasons – Mesurage de puissance – Balances de forces de rayonnement et

exigences de fonctionnement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 17.140.50 ISBN 978-2-83220-617-1

– 2 – 61161 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 List of symbols . 9
5 Requirements for radiation force balances . 9
5.1 General . 9
5.2 Target type . 10
5.2.1 General . 10
5.2.2 Absorbing target . 10
5.2.3 Reflecting target . 10
5.3 Target diameter . 11
5.4 Balance/force measuring system . 11
5.5 System tank . 11
5.6 Target support structures . 11
5.7 Transducer positioning . 11
5.8 Anti-streaming foils . 11
5.9 Transducer coupling . 12
5.10 Calibration . 12
6 Requirements for measuring conditions . 12
6.1 Lateral target position . 12
6.2 Transducer/target separation . 12
6.3 Water . 12
6.4 Water contact . 13
6.5 Environmental conditions . 13
6.6 Thermal drifts . 13
7 Measurement uncertainty . 13
7.1 General . 13
7.2 Balance system including target suspension . 13
7.3 Linearity and resolution of the balance system . 13
7.4 Extrapolation to the moment of switching the ultrasonic transducer . 14
7.5 Target imperfections . 14
7.6 Reflecting target geometry . 14
7.7 Lateral absorbers in the case of reflecting target measurements . 14
7.8 Target misalignment . 14
7.9 Ultrasonic transducer misalignment . 14
7.10 Water temperature . 14
7.11 Ultrasonic attenuation and acoustic streaming . 14
7.12 Foil properties . 14
7.13 Finite target size . 15
7.14 Plane-wave assumption . 15
7.15 Scanning influence . 15
7.16 Environmental influences . 15
7.17 Excitation voltage measurement . 15
7.18 Ultrasonic transducer temperature . 15

61161 © IEC:2013 – 3 –
7.19 Nonlinearity . 15
7.20 Acceleration due to gravity . 15
7.21 Other sources . 16
Annex A (informative) Additional information on various aspects of radiation force
measurements . 17
Annex B (informative) Basic formulae . 30
Annex C (informative) Other methods of ultrasonic power measurement . 36
Annex D (informative) Propagation medium and degassing . 37
Annex E (informative) Radiation force measurement with diverging ultrasonic beams . 38
Annex F (informative) Limitations associated with the balance arrangements . 42
Bibliography . 46

Figure 1 – Section through an absorbing target . 16
Figure 2 – Linearity check: balance readout as a function of the input quantity . 16
Figure E.1 – Piston result (oscillating curve) for P/cF as a function of ka . 39
Figure E.2 – P/cF as a function of ka for four different pseudo-trapezoidal amplitude
distributions . 39
Figure E.3 – Ratio of the radiation conductance G as obtained using a convex-conical
reflecting target to an absorbing target versus the value of ka [29] . 41
Figure F.1 – Arrangement A .
...