International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 61161:2013
Title Ultrasonics - Power measurement - Radiation force balances and performance requirements
Project Number 23755
Abstract/Scope 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).


Current Stage code 6060
Current Stage code date 2013-04-12
Current Stage code deadline 2013-12-06
Deadline date for vote  


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IEC Technical Body IEC/TC 87
Reference Document IEC 61161:2013 (EQV)
ICS 17.140.50 - Electroacoustics
Keywords Ultrasonics; Power measurement; Radiation; Force balance
Note Supersedes EN 61161:2007
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2013-04-12 2013-12-06 export to doc file  EN  FR  DE
5099 2013-03-06 2013-04-03  
5060 2013-01-14 2013-02-04 export to doc file  EN
5020 2012-11-02 2013-01-11  
3090 2012-03-09 2012-09-30  
5060 2012-02-27 2012-03-19 export to doc file  EN
5020 2011-09-23 2012-02-24  
1090 2011-09-20 2011-09-23  

Implementation Dates

date of Ratification (DOR) (1) 2013-03-06
date of Availability (DAV) (2) 2013-04-12
date of Announcement (DOA) (3) 2013-06-06
date of Publication (DOP) (4) 2013-12-06
date of Withdrawal (DOW) (5) 2016-03-06


Supersedes EN 61161:2007
Superseded by  
Normative reference (6) EN 61689:2007

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.