高速大容量气溶胶粒子分类计数存储器的设计

Design of high-speed and large-capacity classifying count storages for aerosol particles

为实现气溶胶颗粒物的空气动力学粒径及其光学粒径的同时测量,对颗粒物按粒径大小进行分类计数,利用电子学多道存储技术,结合大规模可编程逻辑电路和高速大容量双端口内存芯片,设计了一种高速大容量粒子分类计数存储器。该存储器实现了单一脉冲计数器与特征信号分类计数器的有机结合,其存储容量高达65535道,每道可计数65535个,操作速度可达15ns;而且线路简单,整个电子学多道电路只需要两片MACH435和两片IDT7009芯片。用设计的存储器对空气中空气动力学粒径为0.5～20μm的气溶胶颗粒物进行计数,得到了颗粒物的粒谱分布。该存储器已应用于本研究所自行研发的空气动力学粒谱仪,完全满足仪器连续、实时、在线监测时对存储速度和容量的要求。

To characterize the size distribution of aerosol particles,a measuring simultaneously method for aerodynamic diameters and optic diameters of the aerosol particles is studied,and then the classifying count principle is described.Based on large-scale programmable logic chips and dual-port high-speed large-capacity memory chips,a high-speed and large-capacity classifiying count storage for aerosol particles is designed by using a multi-channel storage technology.By combining with the functions of single pulse counters and characteristic signal classifiying counters,the storage can offer the capacity up to 65 535 channels,each of which can count to 65 535 particles with a operating speed up to 15 ns.The storage has a simple circuit,and its multiple channel circuits make only up of two MACH435 and two IDT7009 chips.The characteristics of aerosol particles with the sizes of 0.5~20 μm in air is counted,and the particle distribution spectra are obtained.As a key storage component of the aerodynamic particle sizer developed by our institute,this storage satisfies the requirements of the measurement in real time for the speed and capacity.