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BS EN IEC 61689:2022 Ultrasonics. Physiotherapy systems. Field specifications and methods of measurement in the frequency range 0,5 MHz to 5 MHz, 2022
- undefined
- Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
- Blank Page [Go to Page]
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Ultrasonic field specifications
- 6 Conditions of measurement and test equipment used [Go to Page]
- 6.1 General
- 6.2 Test vessel
- 6.3 Hydrophone
- 6.4 RMS peak signal measurement
- 7 Type testing reference procedures and measurements [Go to Page]
- 7.1 General
- 7.2 Rated output power
- 7.3 Hydrophone measurements
- 7.4 Effective radiating area [Go to Page]
- 7.4.1 Effective radiating area measurements
- 7.4.2 Hydrophone positioning
- 7.4.3 Beam cross-sectional area determination
- 7.4.4 Active area gradient determination
- 7.4.5 Beam type determination
- 7.4.6 Effective radiating area calculation
- 7.4.7 Beam non-uniformity ratio calculation
- 7.4.8 Testing requirements
- 7.5 Reference type testing parameters
- 7.6 Acceptance criteria for reference type testing
- 8 Routine measurement procedure [Go to Page]
- 8.1 General
- 8.2 Rated output power
- 8.3 Effective radiating area
- 8.4 Beam non-uniformity ratio
- 8.5 Effective intensity
- 8.6 Acceptance criteria for routine testing
- 9 Sampling and uncertainty determination [Go to Page]
- 9.1 Reference type testing measurements
- 9.2 Routine measurements
- 9.3 Uncertainty determination
- Annexes [Go to Page]
- Annex A (normative) Guidance for performance and safety [Go to Page]
- A.1 General
- A.2 Rated output power
- A.3 Effective intensity
- A.4 Beam non-uniformity ratio [Go to Page]
- A.4.1 General
- A.4.2 Rationale behind using a limiting value for the beam non-uniformity ratio (RBN)
- Figures [Go to Page]
- Figure A.1 – Normalized, time-averaged values of acoustic intensity (solid line) and of one of its plane-wave approximations (broken line), existing on the axis of a circular piston source of ka = 30, plotted against the normalized distance sn, where sn = λz/a2
- Figure A.2 – Histogram of RBN values for 37 treatment heads of various diameters and frequencies
- Annex B (normative) Raster scan measurement and analysis procedures [Go to Page]
- B.1 General
- B.2 Requirements for raster scans
- B.3 Requirements for analysis of raster scan data [Go to Page]
- B.3.1 General
- B.3.2 Total mean square acoustic pressure
- B.3.3 Calculation of the beam cross-sectional area, ABCS
- Annex C (normative) Diametrical or line scan measurement and analysis procedures [Go to Page]
- C.1 General
- C.2 Requirements for line scans
- C.3 Analysis of scans
- Tables [Go to Page]
- Table C.1 – Constitution of the transformed array [B] used for the analysis of half-line scans
- Annex D (informative) Rationale concerning the beam cross-sectional area definition
- Annex E (informative) Factor used to convert the beam cross-sectional area (ABCS) at the face of the treatment head to the effective radiating area (AER)
- Figure E.1 – Conversion factor Fac as a function of the ka product for ka product between 40 and 160
- Annex F (informative) Determining acoustic power through radiation force measurements
- Table F.1 – Necessary target size, expressed as the minimum target radius b, as a function of the ultrasonic frequency, f, the effective radius of the treatment head, a1, and the target distance, z, calculated in accordance with A.5.3.1 of IEC 61161:2013(see [8])
- Annex G (informative) Validity of low-power measurements of the beam cross-sectional area (ABCS)
- Table G.1 – Variation of the beam cross-sectional area ABCS(z) with the indicated output power from two transducers
- Annex H (informative) Influence of hydrophone effective diameter
- Table H.1 – Comparison of measurements of the beam cross-section alarea ABCS(z) made using hydrophones of geometrical active elemen tradii 0,3 mm, 0,5 mm and 2,0 mm
- Annex I (informative) Effective radiating area measurements using a radiation force balance and absorbing apertures [Go to Page]
- I.1 General
- I.2 Concept of aperture method
- I.3 Requirements for the aperture method [Go to Page]
- I.3.1 Radiation force balance
- I.3.2 Apertures
- Figure I.1 – Schematic representation of aperture measurement set-up [Go to Page]
- I.4 Measurement procedure for determining the effective radiating area
- I.5 Analysis of raw data to derive the effective radiating area
- Table I.1 – Aperture measurement check sheet
- Figure I.2 – Measured power as a function of aperture diameter for commercially available 1 MHz physiotherapy treatment heads
- Table I.2 – Annular power contributions
- Table I.3 – Annular intensity contributions
- Table I.4 – Annular intensity contributions, sorted in descending order
- Table I.5 – Annular power contributions, sorted in descending order of intensity contribution
- Table I.6 – Cumulative sum of annular power contributions, previously sorted in descending order of intensity contribution, and the cumulative sum of their respective annular areas [Go to Page]
- I.6 Implementation of the aperture technique
- Figure I.3 – Cumulative sum of annular power contributions, previously sorted in descending order of intensity contributions, plotted against the cumulative sum of their respective annular areas [Go to Page]
- I.7 Relationship of results to reference testing method
- Annex J (informative) Guidance on uncertainty determination
- Annex K (informative) Examples of pulse duration and pulse repetition period of amplitude modulated waves
- Figure K.1 – Example 1: Tone-burst (i.e. rectangular modulation waveform)
- Figure K.2 – Example 2: Half-wave modulation with no filtering of the AC mains voltage
- Figure K.3 – Example 3: Full-wave modulation with no filtering of the AC mains voltage
- Figure K.4 – Example 4: Half-wave modulation with filtering of the AC mains voltage; filtering insufficient to define the wave as continuous wave (3.17)
- Figure K.5 – Example 5: Full-wave modulation with filtering of the AC mains voltage; filtering insufficient to define the wave as continuous wave (3.17)
- Bibliography [Go to Page]
