BS ISO 20998-2:2013
$167.15
Measurement and characterization of particles by acoustic methods – Guidelines for linear theory
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 42 |
This part of ISO 20998 describes ultrasonic attenuation spectroscopy methods for determining the size distributions of a particulate phase dispersed in a liquid at dilute concentrations, where the ultrasonic attenuation spectrum is a linear function of the particle volume fraction. In this regime, particle–particle interactions are negligible. Colloids, dilute dispersions, and emulsions are within the scope of this part of ISO 20998. The typical particle size for such analysis ranges from 10 nm to 3 mm, although particles outside this range have also been successfully measured. For solid particles in suspension, size measurements can be made at concentrations typically ranging from 0,1 % volume fraction up to 5 % volume fraction, depending on the density contrast between the solid and liquid phases, the particle size, and the frequency range.
NOTE See References [9][10].
For emulsions, measurements may be made at much higher concentrations. These ultrasonic methods can be used to monitor dynamic changes in the size distribution.
While it is possible to determine the particle size distribution from either the attenuation spectrum or the phase velocity spectrum, the use of attenuation data alone is recommended. The relative variation in phase velocity due to changing particle size is small compared to the mean velocity, so it is often difficult to determine the phase velocity with a high degree of accuracy, particularly at ambient temperature. Likewise, the combined use of attenuation and velocity spectra to determine the particle size is not recommended. The presence of measurement errors (i.e. “noise”) in the magnitude and phase spectra can increase the ill-posed nature of the problem and reduce the stability of the inversion.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | Foreword |
| 7 | Introduction |
| 9 | Section sec_1 Section sec_2 Section sec_3 Section sec_3.1 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | Section sec_3.2 Section sec_3.3 Section sec_3.4 Section sec_4 4 Symbols and abbreviated terms |
| 12 | Section sec_5 Section sec_5.1 Section sec_5.2 5 Mechanism of attenuation (dilute case) 5.1 Introduction 5.2 Excess attenuation coefficient |
| 13 | Section sec_5.3 Section sec_5.3.1 Section sec_5.3.2 Section sec_5.3.3 Section sec_5.4 Section sec_5.4.1 5.3 Specific attenuation mechanisms 5.4 Linear models |
| 14 | Section sec_5.4.2 Table tab_1 |
| 15 | Table tab_2 Section sec_6 Section sec_6.1 6 Determination of particle size 6.1 Introduction |
| 16 | Section sec_6.2 Section sec_6.2.1 Section sec_6.2.2 6.2 Inversion approaches used to determine PSD |
| 17 | Section sec_6.3 Section sec_7 Section sec_7.1 Section sec_7.2 Section sec_7.2.1 Section sec_7.2.2 6.3 Limits of application 7 Instrument qualification 7.1 Calibration 7.2 Precision |
| 18 | Section sec_7.2.3 Section sec_7.3 Section sec_7.3.1 Section sec_7.3.2 Section sec_7.3.3 Section sec_7.3.4 Section sec_7.3.5 7.3 Accuracy |
| 19 | Section sec_8 8 Reporting of results |
| 20 | Annex sec_A Annex A (informative) Viscoinertial loss model |
| 21 | Annex sec_B Annex sec_B.1 Figure fig_B.1 Annex sec_B.2 Annex B (informative) ECAH theory and limitations |
| 23 | Annex sec_B.3 |
| 24 | Annex sec_C Annex C (informative) Example of a semi-empirical model |
| 25 | Table tab_c Figure fig_C.1 |
| 27 | Annex sec_D Annex D (informative) Iterative fitting |
| 28 | Figure fig_D.1 |
| 29 | Annex sec_E Table tab_E.1 Table tab_E.2 Table tab_E.3 Annex E (informative) Physical parameter values for selected materials |
| 30 | Annex sec_F Annex sec_F.1 Annex sec_F.2 Table tab_d Figure fig_.1 Annex F (informative) Practical example of PSD measurement |
| 31 | Table tab_F.1 Annex sec_F.3 |
| 32 | Table tab_e Figure fig_.2 Table tab_F.2 Annex sec_F.4 |
| 33 | Table tab_F.3 |
| 34 | Annex sec_F.5 Table tab_F.4 |
| 35 | Annex sec_F.6 Table tab_f Figure fig_.3 Table tab_F.5 |
| 36 | Table tab_g Figure fig_.4 Table tab_F.6 |
| 37 | Table tab_h Figure fig_.5 |
| 38 | Reference ref_1 Reference ref_2 Reference ref_3 Reference ref_4 Reference ref_5 Reference ref_6 Reference ref_7 Reference ref_8 Reference ref_9 Reference ref_10 Reference ref_11 Reference ref_12 Reference ref_13 Reference ref_14 Reference ref_15 Reference ref_16 Reference ref_17 Reference ref_18 Reference ref_19 Reference ref_20 Reference ref_21 Bibliography |
| 39 | Reference ref_22 Reference ref_23 Reference ref_24 Reference ref_25 Reference ref_26 Reference ref_27 Reference ref_28 Reference ref_29 Reference ref_30 Reference ref_31 Reference ref_32 Reference ref_33 Reference ref_34 |
