Abstract

The performance of two different optical concentration-measuring techniques was investigated over a concentration range starting with about 10 2 cm −3 and extending over more than four decades. Both instruments are capable of real-time counting, however due to their particular design-single particle counter and ensemble particle-measuring system—they operate in overlapping, but different concentration ranges. The upper, coincidence-free counting limit for the single particle counter used in this study was established to be in the order of 10 4 cm −3. The ensemble technique was found to be functional and stable for concentrations of about 10 3 cm −3 and limited by the onset of multiple scattering at concentrations nearby 2×10 6 cm −3. Within the determined boundaries, both techniques proved to provide reliable aerosol concentration data.

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