常温常压下，算出样品中微粒或分子的尺寸分布情况，析测量微粒或分子的尺寸和分布。 它基于光散射原理，通过激光光束照射样品中的微粒或分子，并测量由其运动引起的散射光的强度变化。

Under normal temperature and pressure, calculate the size distribution of particles or molecules in the sample, analyze and measure the size and distribution of particles or molecules. Based on the principle of light scattering, it irradiates particles or molecules in a sample by a laser beam and measures the intensity change of scattered light caused by its motion.