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Updated: Jan 25, 2026

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System
Published on: May 22, 2020
Portable device to determine particle asymmetry parameter
Abstract:
Accurate characterization of the asymmetry parameter g is of crucial importance for radiative transfer calculations. Here, we present a portable light scattering (PLS) device designed for in situ, real-time, and contact-free measurements of the particle phase function. The integration time is 20ms for each measurement. Using this device, we measured g values for laboratory-generated brown (organic) carbon aerosol and soot, and commercially available Arizona Road Dust. For the three types of aerosol, the g values were 0.664 ± 0.002, 0.506 ± 0.004, and 0.701 ± 0.020, respectively. The smallest angle our PLS device approaches is 0.7°, which is an order of magnitude smaller than that of commercial nephelometers, thus facilitating more accurate determination of g.
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