光学颗粒计数测量技术，以激光器作光源，利用高灵敏度光电探测器件逐个测量被测颗粒的散射光，从而获得微米级颗粒的尺寸和数量参数。该技术对微电子、医药、机械工程、石油等许多工业领域具有重要意义。本文拟对该技术所需的理论基础，从物理和数学的角度较全面地加以阐述，从而建立起一套实用化的理论模型。 Optical particle counting measurement technology, the laser as a light source, the use of high-sensitivity photodetection devices measured one by one measured scattered light particles to obtain micron-sized particles size and number of parameters. The technology of microelectronics, medicine, mechanical engineering, petroleum and many other industrial areas of great significance. In this paper, the theoretical basis for this technology is to be elaborated, from a physical and mathematical point of view to more fully elaborated, so as to establish a set of practical theoretical model.