Performance study of portable devices for the real-time measurement of airborne particle number concentration and size (distribution)

[摘要] The aim of this experimental study was to investigate the performance of both portable and transportable devices devoted to the real-time measurement of airborne particle number concentration and size (distribution). Electrical mobility spectrometers (SMPS, FMPS, Nanoscan) as well as diffusion chargers (DiSCmini, Nanotracer) were studied. Both monodisperse and polydisperse aerosols were produced within the CAIMAN facility to challenge the instruments. The monodisperse test aerosols were selected in the 15-400 nm diameter range using a differential mobility analyser (DMA), and presented number concentrations of between 6.102and 2.105cm-3. The polydisperse test aerosols presented modal diameters of between 8 and 270 nm and number concentrations between 4.103to 106cm-3. The behavior of the different devices is expressed as (1) the ratio of the reported diameter to the reference diameter, and (2) the ratio of the reported number concentration to the reference concentration. These results are displayed as boxplots to better represent the statistical distribution of the experimental results. For the group of electrical mobility spectrometers, a good agreement between SMPS and FMPS and the reference was demonstrated. A slight tendency for the Nanoscan to underestimate particle size distribution for particles above around 100 nm was observed. The data reported for the group of diffusion chargers demonstrate that all, except the Nanotracer, show a tendency to underestimate particle diameter, by a factor around -40% to -10%. In the case of particle concentration, larger deviations were observed.

[发布机构] Institut National de Recherche et de Sécurité (INRS), Laboratoire de Métrologie des Aérosols, Rue du Morvan, CS 60027, Vandoeuvre Cedex; F 54519, France^1;Central Institute for Labour Protection (CIOP-PIB), Department of Chemical, Aerosol and Biological Hazards, Warsaw; PL 00-701, Poland^2

[效力级别] 医药卫生

[关键词] Differential mobility;Electrical mobility spectrometers;Number concentration;Particle concentrations;Polydisperse aerosols;Real time measurements;Reference concentration;Statistical distribution