Single Particle Counting

Ararwal, J.K. and G.J. Sem, Continuous Flow, Single-Particle-Counting Condensation Nuclei Counter, J. Aerosol Sci. 11 343-358 (1980). 

In single-particle counting, the number count is the directly measured result. Fig.7 shows the differential number count fraction (normalized by the log of diameter) from four samples. The resolution and sensitivity of the method is apparent. Three samples show a prominent peak near 7 xm, while the fourth shows a broader and larger-diameter distribution. Subtle differences can be resolved among the samples. The degree of repeatability is shown in Fig.8, where two samples of the same material were run at different concentration total counts were 32000 and 62000, with excellent consistency in distribution shape. 

Highest resolution - single particles counted/sized at high speed. 

---