Aerosol measurement system for the DEMONA experiment

In the frame of the international large scale DEMONA experiment, highly concentrated metal oxide aerosol particles are produced and measured in a large containment (640 m3) under unusual conditions (steam saturated atmosphere, temperature of 120-1350C, pressure of 2-3 bar). The initial mass concentration of aerosol particles is between 1 and 10 g/m3 and the change in aerosol concentration as a function of time is of several orders of magnitude. Additionally, the aerosol is a three components system; besides the gaseous phase (an air-steam mixture), one finds solid aerosol particles, liquid aerosol particles (water droplets) and/or liquid aerosol with a solid core. By using a highly reliable system specially developed for this experiment, mass concentration of solid aerosols and of droplets, particle size distribution of solid and liquid aerosols, density and form of the aerosol particles, the mass of the condensed water on walls and on ground were measured as a function of time and location. (orig.)