Evaluation of the Alphasense optical particle counter (OPC-N2) and the Grimm portable aerosol spectrometer (PAS-1.108)

Sinan Sousan, Kirsten A Koehler, Laura Hallett, Thomas M. Peters

Research output: Contribution to journalArticle

Abstract

We compared the performance of a low-cost (∼$500), compact optical particle counter (OPC, OPC-N2, Alphasense) to another OPC (PAS-1.108, Grimm Technologies) and reference instruments. We measured the detection efficiency of the OPCs by size from 0.5 to 5 µm for monodispersed, polystyrene latex (PSL) spheres. We then compared number and mass concentrations measured with the OPCs to those measured with reference instruments for three aerosols: salt, welding fume, and Arizona road dust. The OPC-N2 detection efficiency was similar to the PAS-1.108 for particles larger than 0.8 µm (minimum of 79% at 1 µm and maximum of 101% at 3 µm). For 0.5-µm particles, the detection efficiency of the OPC-N2 was underestimated at 78%, whereas PAS-1.108 overestimated concentrations by 183%. The mass concentrations from the OPCs were linear (r ≥ 0.97) with those from the reference instruments for all aerosols, although the slope and intercept were different. The mass concentrations were overestimated for dust (OPC-N2, slope = 1.6; PAS-1.108, slope = 2.7) and underestimated for welding fume (OPC-N2, slope = 0.05; PAS-1.108, slope = 0.4). The coefficient of variation (CV, precision) for OPC-N2 for all experiments was between 4.2% and 16%. These findings suggest that, given site-specific calibrations, the OPC-N2 can provide number and mass concentrations similar to the PAS-1.108 for particles larger than 1 µm.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalAerosol Science and Technology
DOIs
StateAccepted/In press - Sep 25 2016

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Radiation counters
Aerosols
Spectrometers
Fumes
spectrometer
aerosol
Dust
Welding
welding
Latexes
Polystyrenes
dust
Salts
Calibration
evaluation
particle
Costs
road
salt
calibration

ASJC Scopus subject areas

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

Cite this

Evaluation of the Alphasense optical particle counter (OPC-N2) and the Grimm portable aerosol spectrometer (PAS-1.108). / Sousan, Sinan; Koehler, Kirsten A; Hallett, Laura; Peters, Thomas M.

In: Aerosol Science and Technology, 25.09.2016, p. 1-14.

Research output: Contribution to journalArticle

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