摘要：介绍了基于颗粒布朗运动信息测定颗粒粒度的理论依据，分别论述了两种测量方法，即颗粒位置信息和颗粒速度信息获取方法。并详细介绍了获取颗粒布朗运动速度的传感器的工作原理、难点和探测器件灵敏阈的分析以及计算机数字模拟和实验测定的情况。

关键词：颗粒布朗运动;粒度测量;颗粒速度;

Abstract：This paper introduced the foundamenta] theory and two method for measuringparticle size based on Brownian movement information,i.e. the obtaining methods of particle sizeinformation and particle's motive velocity information. The working principle of the sensor for ob.taining particle's Brownian movtive velocity, the difficulty and analysis of sensitivity threshole fordetecting sensor were explained in detail. Some situations of computer simulated in digit and experimental measure were alto introduced.

Key words：particle's Brownian movement;particle size measurement;particle smotive velocity