材料颗粒度的测定对粉末冶金,化学品及药物制造等工业都具有相当重要的作用。利用激光衍射原理进行颗粒度测量的最大优点就是与颗粒本身性质及其周围介质无关,因此它可以测量粉末、乳状液、悬浮体的颗粒,并且测量不同类型或不同浓度的试样不必重新校正仪器。根据Fraunhofer近似值原理, Determination of particle size of the material for the powder metallurgy, chemicals and pharmaceutical manufacturing industries have a very important role. The biggest advantage of using the principle of laser diffraction particle size measurement is independent of the nature of the particles and the surrounding medium, it can measure the powder, emulsion, suspension particles, and the measurement of different types or concentrations of samples do not have to recalibrate the instrument . According to the Fraunhofer approximation principle,