Minimizing the effect of density in determination of particle aerodynamic diameter using a time of flight instrument

Particle aerodynamic diameter measurement using an aerosizer (a time-of-flight (TOF) particle size measurement instrument) requires assuming the density of particle being measured. In this paper, a relationship between TOF of spherical particles with different densities through three laser beams, and the lumped parameter, Log[daeCD−1/2], is found. This allows the effect of density in particle aerodynamic diameter measurement to be minimized.