本文件规定了用于测定以稀释浓度分散在液体中的颗粒相的尺寸分布的超声衰减光谱方法的要求，其中超声衰减光谱是颗粒体积分数的线性函数。在这种情况下，粒子-粒子相互作用可以忽略不计。胶体、稀分散体和乳液在本文件的范围内。这种分析的典型粒度范围为10？纳米到3？mm，尽管也成功地测量了该范围之外的颗粒。对于悬浮液中的固体颗粒，可以在浓度范围通常为0.1？体积%高达5？%体积，取决于固相和液相之间的密度对比度、粒度和频率范围[9]、[10]。对于乳液，可以在高得多的浓度下进行测量。这些超声波方法可用于监测尺寸分布的动态变化。

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.