Standards Development

Scope

This International Standard

–        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;

–        provides information on assessment of overall measurement uncertainties.

This International Standard is applicable to:

–        the measurement of ultrasonic power based on the use of a radiation force balance;

–        frequency and power limits are determined by target and balance performance;

–        the measurement of total ultrasonic power in well-collimated, diverging and focused ultrasonic fields;

–        the use of radiation force balances of the gravimetric type or force feedback type.

(See also Clause A.1)

NOTE 1 A focused beam is converging in the pre-focal range and diverging beyond focus.

NOTE 2 Ultrasonic power measurement in the high intensity therapeutic ultrasound (HITU) range, i.e. beyond 1 W or 20 W, respectively, is dealt in the IEC 62555 [6].