摘要：提出了综合运用夫朗和费衍射和米氏散射，即在大粒径范围内采用夫朗和费衍射理论，而在小粒径范围内采用米氏散射理论，来改善小粒径范围内的测量精度，保证激光测粒仪在整个粒径范围内的测量精度。

关键词：激光测粒仪;夫朗和费衍射;米氏散射;

Abstract：Recently,laser particle sizer has been widely used in powder technology.This kindof instrumentation is based on the Fraunhofer diffraction. The accuracy in small size range istherefore, not sufficient. In this paper, the Fraunhofer diffraction and Mie scattering theory arei.e, in large size range, the Franhofer diffraction, while in small size range, the Mie scat-used，teing.The measuring accuracy in small size range is thus improved.This leads to the performanceimprovement of laser particle sizer in the whole size range

Key words：laser particle sizer;fraunhofer diffraction;Mei scattering