Recently, laser particlesizer has been widely used in powder technology. This kind of instrumentation is based on the Fraunhofer diffraction. The accuracy in small size range is therefore, not sufficient. In this paper, the Fraunhofer diffraction and Mie scattering theory are used, i.e, in large size range, the Franhofer diffraction, while in small size range, the Mie scat-teing. The measuring accuracy in small size range is thus improved.This leads to the performance improvement of laser particle sizer in the whole size range.

First Author:王乃宁，教授，联邦德国斯图加特大学工学博士，中国颗粒学会理事，中国计量测试学会多相检测技术专业委员会副主任，现任华东工业大学颗粒技术研究室主任。从事激光光散射颗粒测量技术的理论和应用开发研究工作，开发了多种实验室用FAM、TSM、PSS激光测粒仪和生产过程中监控用仪器。

DOI：10.13732/j.issn.1008-5548.1996.01.001