GB/T 29022-2021 Active

This document specifies the method of using dynamic light scattering (DLS) to measure the average hydrodynamic diameter and particle size distribution of submicron-sized particles, emulsions, or fine bubbles dispersed in liquids. DLS is also known as "quasi-elastic light scattering (QELS)" and "photon correlation spectroscopy (PCS)", although photon correlation spectroscopy is actually one of the measurement techniques. This document is applicable to the measurement of dilute and concentrated suspensions over a wide concentration range. When measuring high and low concentration samples, DLS uses the same measurement principle, but high concentration samples have special requirements for instrument construction and sample preparation. In the high concentration state, the dominant effects of particle-particle interaction and multiple scattering will appear, resulting in significant differences in the particle size measurement results of high and low concentration samples.