An aerodynamic aerosol classifier (AAC) is an embodiment of a measurement technique for classifying aerosol particles according to their aerodynamic diameters.
The technique allows online size classification of particles without requiring them to be electrically charged, and advantageously allows selection of particles within a narrow range of aerodynamic diameters. This is by contrast to an impactor or virtual impactor, which allow only particles smaller than, or larger than, a certain cut-point, respectively. A practically implementable AAC can classify particles from the nanometre range to a few microns in size.
This removes many of the difficulties associated with multiple charging artifacts, such as may be encountered when classifying particles by size according to electrical mobility (such as the differential mobility analyser or DMA). The selection of particles by aerodynamic diameter also lends itself to respiratory and inhalation applications as this metric directly affects lung deposition.
A scanning aerodynamic size spectrometer (SASS) uses a condensation particle counter (CPC) downstream of an AAC to measure high resolution aerodynamic particle size distributions (APSD). The AAC's rotational speed is ramped up or down, continuously changing the size of particle passed, whist the CPC counts the particles. An inversion algorithm takes into account the particle residence timings in the classifier and in the CPC to produce the final size distribution. The technique is similar in principle to the scanning mobility particle sizer (SMPS), which instead produces an electrical mobility size spectrum, although the SASS inversion does not need to take account of particle charge state. The SASS was first described by Johnson et al.[2]
Referencesedit
^Tavakoli, Farzan; Symonds, Jonathan P. R.; Olfert, Jason S. (2014). "Generation of a Monodisperse Size-Classified Aerosol Independent of Particle Charge". Aerosol Science and Technology. 48 (3): i-iv. Bibcode:2014AerST..48D...1T. doi:10.1080/02786826.2013.877121.
^Johnson, Tyler J.; Symonds, Jonathan P. R.; Olfert, Jason S.; Boies, Adam M. (2021-02-01). "Accelerated measurements of aerosol size distributions by continuously scanning the aerodynamic aerosol classifier". Aerosol Science and Technology. 55 (2): 119–141. Bibcode:2021AerST..55..119J. doi:10.1080/02786826.2020.1830941. ISSN 0278-6826. S2CID 228975295.
January 01, 1970
aerodynamic, aerosol, classifier, aerodynamic, aerosol, classifier, embodiment, measurement, technique, classifying, aerosol, particles, according, their, aerodynamic, diameters, technique, allows, online, size, classification, particles, without, requiring, t. An aerodynamic aerosol classifier AAC is an embodiment of a measurement technique for classifying aerosol particles according to their aerodynamic diameters The technique allows online size classification of particles without requiring them to be electrically charged and advantageously allows selection of particles within a narrow range of aerodynamic diameters This is by contrast to an impactor or virtual impactor which allow only particles smaller than or larger than a certain cut point respectively A practically implementable AAC can classify particles from the nanometre range to a few microns in size This removes many of the difficulties associated with multiple charging artifacts such as may be encountered when classifying particles by size according to electrical mobility such as the differential mobility analyser or DMA The selection of particles by aerodynamic diameter also lends itself to respiratory and inhalation applications as this metric directly affects lung deposition The technique is described by Olfert et al 1 Scanning aerodynamic size spectrometer editA scanning aerodynamic size spectrometer SASS uses a condensation particle counter CPC downstream of an AAC to measure high resolution aerodynamic particle size distributions APSD The AAC s rotational speed is ramped up or down continuously changing the size of particle passed whist the CPC counts the particles An inversion algorithm takes into account the particle residence timings in the classifier and in the CPC to produce the final size distribution The technique is similar in principle to the scanning mobility particle sizer SMPS which instead produces an electrical mobility size spectrum although the SASS inversion does not need to take account of particle charge state The SASS was first described by Johnson et al 2 References edit Tavakoli Farzan Symonds Jonathan P R Olfert Jason S 2014 Generation of a Monodisperse Size Classified Aerosol Independent of Particle Charge Aerosol Science and Technology 48 3 i iv Bibcode 2014AerST 48D 1T doi 10 1080 02786826 2013 877121 Johnson Tyler J Symonds Jonathan P R Olfert Jason S Boies Adam M 2021 02 01 Accelerated measurements of aerosol size distributions by continuously scanning the aerodynamic aerosol classifier Aerosol Science and Technology 55 2 119 141 Bibcode 2021AerST 55 119J doi 10 1080 02786826 2020 1830941 ISSN 0278 6826 S2CID 228975295 Retrieved from https en wikipedia org w index php title Aerodynamic aerosol classifier amp oldid 1222503766, wikipedia, wiki, book, books, library,
