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).

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PDF Pages	PDF Title
6	English CONTENTS
8	INTRODUCTION
9	1 Scope 2 Normative references 3 Terms and definitions
11	4 List of symbols 5 Requirements for radiation force balances 5.1 General
12	5.2 Target type 5.2.1 General 5.2.2 Absorbing target 5.2.3 Reflecting target
13	5.3 Target diameter 5.4 Balance/force measuring system 5.5 System tank 5.6 Target support structures 5.7 Transducer positioning 5.8 Anti-streaming foils
14	5.9 Transducer coupling 5.10 Calibration 6 Requirements for measuring conditions 6.1 Lateral target position 6.2 Transducer/target separation 6.3 Water
15	6.4 Water contact 6.5 Environmental conditions 6.6 Thermal drifts 7 Measurement uncertainty 7.1 General 7.2 Balance system including target suspension 7.3 Linearity and resolution of the balance system
16	7.4 Extrapolation to the moment of switching the ultrasonic transducer 7.5 Target imperfections 7.6 Reflecting target geometry 7.7 Lateral absorbers in the case of reflecting target measurements 7.8 Target misalignment 7.9 Ultrasonic transducer misalignment 7.10 Water temperature 7.11 Ultrasonic attenuation and acoustic streaming 7.12 Foil properties
17	7.13 Finite target size 7.14 Plane-wave assumption 7.15 Scanning influence 7.16 Environmental influences 7.17 Excitation voltage measurement 7.18 Ultrasonic transducer temperature 7.19 Nonlinearity 7.20 Acceleration due to gravity
18	7.21 Other sources Figures Figure 1 – Section through an absorbing target Figure 2 – Linearity check: balance readout as a function of the input quantity
19	Annex A (informative) Additional information on various aspects of radiation force measurements
32	Annex B (informative) Basic formulae
38	Annex C (informative) Other methods of ultrasonic power measurement
39	Annex D (informative) Propagation medium and degassing
40	Annex E (informative) Radiation force measurement with diverging ultrasonic beams
43	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]
44	Annex F (informative) Limitations associated with the balance arrangements Figure F.1 – Arrangement A
46	Figure F.7 – Arrangement F with absorbing target Figure F.6 – Arrangement F, with convex-conical reflecting target
47	Table F.1 – Advantages and disadvantages of different arrangements
48	Bibliography

Published By	Publication Date	Number of Pages
BSI	2013	54


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Status	Definitive
Pages	54
Publication Date	2013-05-31
ISBN	978 0 580 71712 3
Standard Number	BS EN 61161:2013
Title	Ultrasonics. Power measurement. Radiation force balances and performance requirements
Identical National Standard Of	IEC 61161:2013, EN 61161:2013
Replaces	BS EN 61161:2007
Descriptors	Radiant flux density, Power measurement, Flux (rate), Ultrasonics, Testing conditions, Transducers, Liquids, Acoustic measurement, Accuracy, Formulae (mathematics), Acoustics, Test equipment, Ultrasonic frequencies
Publisher	BSI
Committee	EPL/87
ICS Codes	17.140.50 - Electroacoustics

BS EN 61161:2013

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