Abstract
Response calculations are presented for four commercially available “Knollenberg” light-scattering aerosol counters: the classical scattering aerosol spectrometer probe (CSASP), the active scattering aerosol spectrometer probe (ASASP), the forward scattering spectrometer probe (FSSP) and the axially scattering spectrometer probe (ASSP). The results show sensitivity of the response to aerosol refractive index for values of indexes characteristic of atmospheric aerosols, and for a particular index, multivalued response for particles in the 0.5–4 μm radius range. The response calculations have been validated for two of these instruments (the CSASP and ASASP) by measurement of monodisperse spherical particles. The size resolution of these two instruments is significantly less than advertised by the manufacturer and measurement of irregular particles causes additional loss of resolution.
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