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BSI PD IEC TS 63001:2024 – TC

BSI PD IEC TS 63001:2024 – TC

$217.84

Tracked Changes. Measurement of cavitation noise in ultrasonic baths and ultrasonic reactors

Published By Publication Date Number of Pages
BSI 2024 87
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PDF Catalog

PDF Pages PDF Title
1 30487612
48 A-30405950
49 undefined
51 CONTENTS
53 FOREWORD
55 INTRODUCTION
56 1 Scope
2 Normative references
3 Terms and definitions
60 4 List of symbols
61 5 Measurement equipment
5.1 Hydrophone
5.1.1 General
5.1.2 Calibration of hydrophone sensitivity
5.1.3 Hydrophone properties
62 5.1.4 Hydrophone compatibility with environment
5.2 Analyser
5.2.1 General considerations
63 5.2.2 Specific measurement method: inertial cavitation spectrum measurement at frequencies between harmonics of  f0
5.2.3 Specific measurement method: Measurement of integrated broadband cavitation noise energy between two frequency bounds
64 5.2.4 Specific measurement method: cavitation noise measurement by extraction of broadband spectral components
5.3 Requirements for equipment being characterized
5.3.1 Temperature and chemistry compatibility with the hydrophone
5.3.2 Electrical interference
6 Measurement procedure
6.1 Reference measurements
6.1.1 Control of environmental conditions for reference measurements
65 6.1.2 Measurement procedure for reference measurements
6.2 In-situ monitoring measurements
66 Annexes
Annex A (informative) Background
A.1 Cavitation in ultrasonic cleaning
Figures
Figure A.1 – Typical setup of an ultrasonic cleaning device
67 Figure A.2 – Spatial distribution of the acoustic pressure level in waterin front of a 35 kHz transducer with reflections on all sides of the water bath (0,12 m × 0,3 m × 0,25 m)
Figure A.3 – Typical Fourier spectrum for sinusoidal ultrasound excitation above the cavitation threshold at an operating frequency of 35 kHz
68 A.2 Practical considerations for measurements
Figure A.4 –Photograph of cavitation structure under the water surface at an operating frequency of 25 kHz
69 A.3 Measurement procedure in the ultrasonic bath
Figure A.5 – Typical rectangular ultrasound signal with a frequency of 25 kHz and 50 Hz double half wave modulation
70 A.4 Characterization methods that do not utilize the acoustic spectrum
71 Annex B (normative) Cavitation noise measurement between harmonics of  f0
B.1 General
B.2 Measurement method
73 Figure B.1 – Block diagram of the measuring method of the cavitation noise level LCN
75 Annex C (informative) Example of cavitation noise measurement between harmonics of  f0
Figure C.1 – Power dependency of the cavitation noise level LCN
Figure C.2 – Diagram with example of spectral acoustic pressure of an ultrasonic bath with an operating frequency of 46 kHz and its harmonics and sub-harmonics
76 Annex D (normative) Measurement of integrated broadband cavitation noise energy between two frequency bounds
D.1 General
D.2 Measurement frequency range
D.3 Definition of integrated broadband cavitation noise energy
77 Annex E (informative) Example of measurement of integrated broadband cavitation noise energy between two frequency bounds
Figure E.1 – Schematic of the cylindrical cavitation hollow cavitation sensor [27], [28]
78 Figure E.2 – High-frequency spectra obtained from the cavitation sensor of the type shown in Figure E.1 [28] for a commercial ultrasonic cleaning vessel operating at 40 kHz whose nominal power setting has been changed from 5 % to 95 % of its full operating power
79 Figure E.3 – Variation in the integrated broadband cavitation energy derived usingthe cylindrical cavitation sensor, from the acoustic spectra shown in Figure E.2
Figure E.4 – Raster scan covering a commercial ultrasonic cleaning vessel with four transducers operating at 40 kHz
80 Annex F (normative) Cavitation noise measurement by extraction of broadband spectral components
F.1 Compensation for extraneous noise
F.2 Features of the acoustic pressure spectrum
Figure F.1 – Schematic representation of acoustic pressure spectrum
81 F.3 Identification of the operating frequency f0 and direct field acoustic pressure
F.3.1 Identification of the operating frequency f0
F.3.2 Fit to primary peak (direct field)
F.3.3 Determination of RMS direct field acoustic pressure
F.3.4 Validation
F.4 Identification of cavitation noise components
F.4.1 Subtraction of direct field component of spectrum
F.4.2 Determination of non-broadband cavitation component
82 F.4.3 Determination of broadband cavitation component
F.4.4 Validation
83 Bibliography

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BSI PD IEC TS 63001:2024 - TC
$217.84