Theoretical basis of the time-of-flight aerosol spectrometer: a method for monitoring the size distribution of submicron aerosol particles
1976; Elsevier BV; Volume: 7; Issue: 4 Linguagem: Inglês
10.1016/0021-8502(76)90083-5
ISSN1879-1964
AutoresMichael H Schwartz, Ronald P. Andres,
Tópico(s)Atmospheric chemistry and aerosols
ResumoA technique is described which shows promise as a method for continuous size analysis of airborne particulates in the size range of a few Angstroms to a micron in a diameter. The aerosol is simply expanded through a nozzle into a vacuum. If the conditions of the expansion are properly chosen, the particle velocity distribution in the resulting flow reflects the particle size distribution in the aerosol and permits size fractionation. A theoretical model for the operation of such a Time-of-Flight Aerosol Spectrometer (TOFAS) is developed, and its resolution characteristics are discussed. Experimental results with Angstrom size particles are also presented and compared with the theoretical predictions of the model.
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