Particle size dependent response of aerosol counters

• Published in: Atmospheric research Vol. 62; no. 3; pp. 209 - 237
• Main Authors: Ankilov, A., Baklanov, A., Colhoun, M., Enderle, K.-H., Gras, J., Julanov, Yu, Kaller, D., Lindner, A., Lushnikov, A.A., Mavliev, R., McGovern, F., O'Connor, T.C., Podzimek, J., Preining, O., Reischl, G.P., Rudolf, R., Sem, G.J., Szymanski, W.W., Vrtala, A.E., Wagner, P.E., Winklmayr, W., Zagaynov, V.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2002; Elsevier
• Subjects: Condensation nuclei counter; Diffusion battery; Earth, ocean, space; Electro mobility spectrometer; Exact sciences and technology; External geophysics; Geophysics. Techniques, methods, instrumentation and models; Intercomparison study; Meteorology; Optical particle counter; Particle detection efficiency; Particles and aerosols; Intercomparison study; Condensation nuclei counter; Diffusion battery; Particle detection efficiency; Optical particle counter; Electro mobility spectrometer; Concentration measurement; Particle size; Particle counter; Nucleation; Efficiency; Condensation nucleus; Monodispersed aerosol; Comparative study
• ISSN: 0169-8095; 1873-2895
• DOI: 10.1016/S0169-8095(02)00011-X

During an international workshop at the Institute for Experimental Physics of the University of Vienna, Austria, which was coordinated within the Committee on Nucleation and Atmospheric Aerosols (IAMAS-IUGG), 10 instruments for aerosol number concentration measurement were studied, covering a wide range of methods based on various different measuring principles. In order to investigate the detection limits of the instruments considered with respect to particle size, simultaneous number concentration measurements were performed for monodispersed aerosols with particle sizes ranging from 1.5 to 50 nm diameter and various compositions. The instruments considered show quite different response characteristics, apparently related to the different vapors used in the various counters to enlarge the particles to an optically detectable size. A strong dependence of the 50% cutoff diameter on the particle composition in correlation with the type of vapor used in the specific instrument was found. An enhanced detection efficiency for ultrafine hygroscopic sodium chloride aerosols was observed with water operated systems, an analogous trend was found for n-butanol operated systems with nonhygroscopic silver and tungsten oxide particles.