LOAC (Light Optical Aerosol Counter)
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Determination of the main nature of the particles: Typology 
 
The 60° measurements are very sensitive to the refractive index of the particles. More absorbing are the particles, lower is the scattered flux
The 60° size distribution is often lower than the 12° real size distribution 
 
The ratio of the 2 size distributions varies with the nature of the particles