ISO 20998-3:2017 PDF

Scope: This document gives guidelines for ultrasonic attenuation spectroscopy methods for determining the size distributions of one or more material phases dispersed in a liquid at high concentrations, where the ultrasonic attenuation spectrum is not a linear function of the particle volume fraction. In this regime, particle-particle interactions are not negligible. This document is applicable to colloids, dispersions, slurries, and emulsions. The typical particle size for such analysis ranges from 10 nm to 3 mm, although particles outside this range have also been successfully measured. Measurements can be made for concentrations of the dispersed phase ranging from about 5 % by volume to over 50 % by volume, depending on the density contrast between the continuous and the dispersed phases, the particle size, and the frequency range[9] [10]. These ultrasonic methods can be used to monitor dynamic changes in the size distribution, including agglomeration or flocculation.

ISO 20998-3:2017 Referenced Document

ISO 14488:2007 Particulate materials - Sampling and sample splitting for the determination of particulate properties
ISO 20998-1:2006 Measurement and characterization of particles by acoustic methods - Part 1: Concepts and procedures in ultrasonic attenuation spectroscopy
ISO 20998-2:2013 Measurement and characterization of particles by acoustic methods.Part 2: Guidelines for linear theory
ISO GUIDE 35:2006 Reference materials - General and statistical principles for certification

2017 ISO 20998-3:2017 Measurement and characterization of particles by acoustic methods - Part 3: Guidelines for non-linear theory