AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Laboratory Evaluation of an Engine Exhaust Particle Sizer (EEPS) Spectrometer for Fast Measurements of Particle Number Size Distributions in Aircraft Exhaust Plumes
Abstract Number: 413 Working Group: Instrumentation and Methods
Abstract We used a TSI Engine Exhaust Particle Sizer (EEPS) spectrometer (model 3090) to measure particle number size distributions in aircraft exhaust plumes during a field experiment at the Narita international airport. The accuracy of particle sizing and concentration measurement in the size range relevant to aircraft exhaust nanoparticles (~6-100 nm) are critical for interpreting the field data. We have set up apparatuses for evaluating the EEPS with monodisperse and polydisperse aerosols using a reference condensation particle counter (CPC) and scanning mobility particle sizer (SMPS) spectrometer that can be traced to particle standards maintained by the National Institute of Advanced Industrial Science and Technology. Test aerosol particles (either polydisperse or monodisperse) were measured in parallel with the EEPS, the reference CPC, and the reference SMPS. The total number concentration that was obtained by integrating the size distribution measured by the EEPS was compared with the number concentration measured by the reference CPC. The size distribution function (dN/dlogd) at each size bin was compared between the EEPS and the reference SMPS. We used polydisperse silver particles with the modal diameter of ~10 nm by evaporation/condensation generator, and mobility-classified monodisperse polystyrene latex particles at 30, 60, 100, and 200 nm. We have found that the EEPS tends to underestimate the number concentration in the size range from 6 to 30 nm.