Aerosol measurements in the submicron size range, studies with an aerosol centrifuge, a new diffusion battery, a low pressure impactor and an advanced condensation nuclei counter

The investigations of four aerosol classifiers which cover finite, but overlapping ranges of the aerosol particle size spectrum are summarized. A cylindrical aerosol centrifuge, which measures aerodynamic equivalent diameters precisely was used as a reference instrument in diffusion battery experiments. The diffusion battery was investigated for fairly large particle sizes to determine the influence of sedimentation, interception, and impaction on the transmission of the diffusion battery. A five stage low pressure impactor which covers the size range from 0.1 micrometer to 25 micrometers diameter was developed specifically for the determination of the deposited particulate mass. A special condensation nuclei counter which measures number-size distributions in the size range from 0.002 micrometers to 0.1 micrometers KELVIN equivalent diameter was also developed.