标准粒子发生器系统的粒子发生规律

Particles occurrence regularity of standard particle generator system

为了给激光尘埃粒子计数器提供可靠的校准、标定依据,研究0.296、0.498、1.019、2.995μm这4种标准粒子在不同稀释液喷射流量和粒子数下的分布规律,分析粒子发生系统中粒子数随工作时间的变化关系,探讨粒子计数器校准中的2种测量方法。结果表明,随粒子粒径的增加,测量粒子数所占总粒子数分数逐渐下降;前3种标准粒子具有稳定分布,后一种分布不稳定,且测量粒子数所占总粒子数分数与稀释液的喷射流量和浓度无关;粒子发生系统的稳定时间约为10 min;不同流量计数器比较校准时,前3种标准粒子适用于双管同时测量的方法,后一种适用于单管分时测量的方法。

In order to provide the reliable calibration rules for laser dust particles counter, the standard particles distribution rule of 0.296、0.498、1.019 and 2.995 μm were studied under the conditions of different diluents jet flow and particles concentration.The particles concentration as a function of working time was analyzed by the particles generation system. Two calibration methods of particles counter were discussed. The results show that the percentage of measured particles descends with the increase of particles size. The distributions of the first three standard particles are stable compared to the latter. The percentage of measured particles are independent of diluents jet flow and particles concentration. The settling time of particles occurrence system is about 10 minutes. The first three standard particles are suitable for double tube simultaneous measurement and the latter is suitable for single tube time-sharing measurement in the comparison calibration of different flow particles counter.