尘埃粒子计数器宏粒子发生装置的研制

Development of Macro Particle Generator for Dust Particle Counter

尘埃粒子计数器是用于检测评价洁净环境洁净度等级的仪器。目前,尘埃粒子计数器的溯源主要通过全国比对的方式对0.5μm的粒子浓度进行溯源,但制药、医疗器械等行业还普遍关注5.0μm粒径通道的计数准确性,然而5.0μm的粒径通道校准却存在气溶胶发生器浓度难控制、单分散性差的难题。本文针对这一技术难题,研制了一款针对尘埃粒子计数器宏粒子(5.0μm)的发生装置,可发生浓度稳定的、准单分散的聚苯乙烯微球气溶胶粒子,用于尘埃粒子计数器宏粒子粒径通道(如1.0μm、3.0μm、5.0μm)的校准溯源。

The dust particle counter is an instrument used to detect and evaluate the cleanliness level of clean environment.At present,the traceability of dust particle counter is mainly through national comparison.In this way,the particle concentration of 0.5μm can be traced,but pharmaceutical,medical devices and other industries also generally pay attention to 5.0μm.However,the calibration of particle size channel of 5.0μm has the problem that it is difficult to control the concentration of aerosol generator and poor monodispersity.Aiming at this technical problem,this paper develops a generator for large particles in the dust particle counter,which can generate quasi monodisperse polystyrene aerosol particles with stable concentration,which can be used in the large particle size channel of the dust particle counter(such as 1.0μm、3.0μm and 5.0μm)calibration traceability.