Abstract
After recalling briefly the optical properties of aerosols, we describe the principle and the working conditions of photoelectric apparatus for aerosol measurements. Two size distribution analyzers are presented: the first one is based on a classical detection principle, the minimum detectable radius being 0.2 µm, and the maximum concentration 3 × 104 particles cm−3; the second one is based on a photon counting technique, with which particles of radius between 0.03 and 0.2 µm can be measured at maximum number concentration of 2 × 106 particles cm−3. We describe then two Condensation Nuclei Counters (CNC) with continuous flux; in these types of apparatus, the vapor of a liquid is condensed on Aitken nuclei using a Peltier effect device. They are thereby rendered visible and counted using a classical photoelectric method. One apparatus works under normal conditions of pressure and temperature, while the other one works under stratospheric conditions, i.e., at low pressure and temperature. The concentration range is still between 10 and 106 nuclei cm−3 and the minimum concentration is 0.1 particle cm−3 in the case of the stratospheric counter. The four devices work on individual particles; their characteristics are compared to those of commercially available apparatus and their advantages discussed.
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Golli, S.E., Madelaine, G., Turpin, P.Y. et al. Recent advances in photoelectric aerosol measurements. Water, Air and Soil Pollution 5, 11–38 (1975). https://doi.org/10.1007/BF00431576
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DOI: https://doi.org/10.1007/BF00431576