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Aerodynamic aerosol classifier
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<h2 id="scanning-aerodynamic-size-spectrometer">Scanning aerodynamic size spectrometer</h2> <p>A scanning aerodynamic size spectrometer (SASS) uses a <a href="/facts/Condensation_particle_counter/sXtggcao">condensation particle counter</a> (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 <a href="/facts/Inverse_problem/Fe01pQ9E">inversion algorithm</a> 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 <a href="/facts/Scanning_mobility_particle_sizer/U9wfSftk">scanning mobility particle sizer</a> (SMPS), which instead produces an <a href="/facts/Electrical_mobility/puR4foqd">electrical mobility</a> 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.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>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. <a href="https://doi.org/10.1080%2F02786826.2013.877121" target="_blank">https://doi.org/10.1080%2F02786826.2013.877121</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>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. <a href="https://www.tandfonline.com/doi/full/10.1080/02786826.2020.1830941" target="_blank">https://www.tandfonline.com/doi/full/10.1080/02786826.2020.1830941</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>