Performance Assessment of Portable Optical Particle Spectrometer (POPS)

Mei, Fan; Mcmeeking, Gavin; Pekour, Mikhail S.; Gao, Ru-Shan; Kulkarni, Gourihar R.; China, Swarup; Telg, Hagen; Dexheimer, Darielle N.; Tomlinson, Jason M.; Schmid, Beat

doi:10.3390/s20216294

Performance Assessment of Portable Optical Particle Spectrometer (POPS)

Journal Article · Thu Nov 05 00:00:00 EST 2020 · Sensors

DOI:https://doi.org/10.3390/s20216294· OSTI ID:1713325

^[1]; Mcmeeking, Gavin ^[2]; ^[1]; Gao, Ru-Shan ^[3]; ^[1]; ^[1]; Telg, Hagen ^[4]; Dexheimer, Darielle N. ^[5]; ^[1]; Schmid, Beat ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Handix Scientiﬁc LLC, Boulder, CO (United States)
NOAA Earth System Research Lab., Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Accurate representation of atmospheric aerosol properties is a long-standing problem in atmospheric research. Modern pilotless aerial systems provide a new platform for atmospheric in situ measurement. However, small airborne platforms require miniaturized instrumentation due to apparent size, power, and weight limitations. A Portable Optical Particle Spectrometer (POPS) is an emerged instrument to measure ambient aerosol size distribution with high time and size resolution, designed for deployment on a small unmanned aerial system (UAS) or tethered balloon system (TBS) platforms. This study evaluates the performance of a POPS with an upgraded laser heater and additional temperature sensors in the aerosol pathway. POPS maintains its performance under different environmental conditions as long as the laser temperature remains above 25 °C and the aerosol flow temperature inside the optical chamber is 15 °C higher than the ambient temperature. The comparison between POPS and an Ultra-High Sensitivity Aerosol Spectrometer (UHSAS) suggests that the coincidence error is less than 25% when the number concentration is less than 4000 cm^–3. The size distributions measured by both of them remained unaffected up to 15,000 cm^–3. While both instruments’ sizing accuracy is affected by the aerosol chemical composition and morphology, the influence is more profound on the POPS.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Organization:: PNNL, BNL, ANL, ORNL

Grant/Contract Number:: AC05-76RL01830; AC06-76RL01830

OSTI ID:: 1713325

Alternate ID(s):: OSTI ID: 1721588

Report Number(s):: PNNL-SA--156649

Journal Information:: Sensors, Journal Name: Sensors Journal Issue: 21 Vol. 20; ISSN 1424-8220

Publisher:: MDPI AGCopyright Statement

Country of Publication:: United States

Language:: English

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