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GB/T 7966-2022Acoustics - Ultrasonic power measurement - Radiation force balances and the requirements (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

March 9, 2022

Implementation date

October 1, 2022

Scope

GB/T 7966-2022 (Acoustics - Ultrasonic power measurement - Radiation force balances and the requirements) is available as an English-translated PDF.

GB/T 7966-2022 is the Chinese standard "Acoustics - Ultrasonic power measurement - Radiation force balances and the requirements".

Its scope clause reads: This document specifies a method for the determination of the total radiated sound power of an ultrasonic transducer based on the use of a radiation force balance; Field and the principle of using radiation force balance measurement; clarified the limitations of radiation force method in the case of cavitation and temperature rise; clarified radiation force method Quantitative usage limitations of the force method in the case of diverging and focused beams; provides methods for estimating the acoustic power of diverging and focused beams using the radiation force method Information; provides information for evaluating the uncertainty of all measurements.

This document applies to. a) Using a radiation force balance, the measurement of ultrasonic power within the frequency range of 0.5MHz~25MHz does not exceed 1W; b) Using a radiation force balance, the measurement of ultrasonic power within the frequency range of 0.75MHz~5MHz does not exceed 20W; c) Measurement of the total ultrasonic power of parallel, divergent and focused ultrasonic fields; d) Measurements using gravity or force feedback radiation force balances.

(see A.1). Note 1.The focused beam converges in the front section of the focal point and diverges after the focal point. Note 2.In the high-intensity therapeutic ultrasound (HITU) range, that is, the measurement of ultrasonic power exceeding 1W or exceeding 20W, respectively, is handled by IEC 62555. Its clauses include terms and definitions.

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Document preview — GB/T 7966-2022

National Standard of the People's Republic of China

Classification: A 59

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Symbol
5 Requirements for radiation force balances
6 Requirements for measurement conditions
7 Measurement uncertainty
Appendix A (informative) Further information on radiation force measurements
Appendix B (Informative) Basic Formula
Appendix C (Informative) Other Methods of Ultrasonic Power Measurement
Appendix D (Informative) Acoustic Media and Degassing
Appendix E (Informative) Radiation Force Measurements of Divergent Ultrasonic Beams
Appendix F (Informative) Limitations of Several Balance Devices

1 Scope

This document specifies a method for the determination of the total radiated sound power of an ultrasonic transducer based on the use of a radiation force balance;

Field and the principle of using radiation force balance measurement; clarified the limitations of radiation force method in the case of cavitation and temperature rise; clarified radiation force method

Quantitative usage limitations of the force method in the case of diverging and focused beams; provides methods for estimating the acoustic power of diverging and focused beams using the radiation force method

Information; provides information for evaluating the uncertainty of all measurements.

This document applies to.

a) Using a radiation force balance, the measurement of ultrasonic power within the frequency range of 0.5MHz~25MHz does not exceed 1W;

b) Using a radiation force balance, the measurement of ultrasonic power within the frequency range of 0.75MHz~5MHz does not exceed 20W;

c) Measurement of the total ultrasonic power of parallel, divergent and focused ultrasonic fields;

d) Measurements using gravity or force feedback radiation force balances.

(see A.1).

Note 1.The focused beam converges in the front section of the focal point and diverges after the focal point.

Note 2.In the high-intensity therapeutic ultrasound (HITU) range, that is, the measurement of ultrasonic power exceeding 1W or exceeding 20W, respectively, is handled by IEC 62555.

2 Normative references

There are no normative references in this document.

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 acousticstreaming

The integral motion of the fluid caused by the sound field.

3.2 freefield

A sound field with negligible boundary effects in an isotropic homogeneous medium.

[Source. GB/T 2900.86-2009, definition 801-23-28, with modifications. does not contain the word "sound"]

3.3 output power

The time-averaged ultrasonic power emitted by an ultrasonic transducer into an approximate free field under specified conditions in a specified medium (preferably water).

Note. The unit of output power is watts (W).

GB/T 3222.2 | GB/T 6882 | GB/T 4854.7 | GB/Z 3222.3 | GB/T 3449 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 71 pages — is available in the English PDF.

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