Abstract
The response characteristics of two commercially available optical particle counters have been studied experimentally using several monodisperse aerosols. The aerosol material used in the study included oleic acid (OA), dioctylphthalate (DOP) and polystyrene latex (PSL) particles. Diameters of these particles ranged from 0.2 to 10 μm, and refractive indices from 1.46 to 1.6. The response curve of the filament lamp counter (Climet 208A) was found to be independent of the particle refractive index for particles larger than 1.7 μm in diameter. The laser optical counter (Royco 236), however, showed a more pronounced particle refractive index effect. Moreover, its response curve was found to have periodic fluctuations in the size range between 1.5 and 5.0 μm. Calibration curves of both optical counters obtained from other research groups are compared and discussed.
Published Version
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