1 Scope
This document specifies requirements for 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
document. 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 % by volume up to 5 % by volume, depending on the density contrast between the
solid and liquid phases, the particle size, and the frequency range [ 9 ],[ 10 ] . For emulsions, measurements can be made at much higher concentrations. These ultrasonic
methods can be used to monitor dynamic changes in the size distribution.
BS ISO 20998-2:2022 history
2022BS ISO 20998-2:2022 Measurement and characterization of particles by acoustic methods.. Linear theory
2013BS ISO 20998-2:2013 Measurement and characterization of particles by acoustic methods. Guidelines for linear theory