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Measurement and characterization of particles by acoustic methods - Part 2: Linear theory
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.
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