Optical particle counting

Condensation nuclei counter growth in alcohol-saturated chamber optical particle counting 37... 

Polydispersed aerosols are used for the efficiency-by-particle size method. Upstream and downstream measurements are made using optical particle counting devices at a variety of flow rates. The dust-holding capacity of a filter is a measurement of the synthetic dust loaded onto a filter under established procedures and a measurement of the pressure drop as the loading increases. 

Some applications require not only a general reduction of particle size, but additionally a limitation of the maximum particle size or the concentration of coarse particles—e.g. pigment dispersion (Ruscitti et al. 2008) or preparation of CMP slurries (e.g. Kuntzsch et al. 2003). These parameters can be measured by special instruments (grindometer, ISO 1524) or by counting methods (e.g. optical particle counting, cf. Xu 2000, pp. 182-222). 

Holve DJ, Annen KD (1984) Optical particle counting, sizing, and velocimetry using intensity deconvolution. Opt Eng 23 235591... 

NicoU, D.F. and Toumbas, P. (2004) Sensors and methods for high-sensitivity optical particle counting and sizing. US Patent 6794671 foreign patents pending. 

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