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Related Experiment Video

Updated: Jan 25, 2026

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System
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Portable device to determine particle asymmetry parameter.

Yuli W Heinson, Christopher M Sorensen, Rajan K Chakrabarty

    Optics Express
    |May 3, 2019
    PubMed
    Summary

    A new portable light scattering (PLS) device enables accurate, real-time measurements of the particle phase function asymmetry parameter (g). This advancement improves radiative transfer calculations for aerosols like carbon and dust.

    Area of Science:

    • Atmospheric Science
    • Optical Physics
    • Aerosol Science

    Background:

    • Accurate characterization of the asymmetry parameter (g) is vital for radiative transfer calculations.
    • Existing methods using commercial nephelometers have limitations in angular resolution.

    Purpose of the Study:

    • To introduce a novel portable light scattering (PLS) device for in situ, real-time, and contact-free particle phase function measurements.
    • To enhance the accuracy of asymmetry parameter (g) determination.

    Main Methods:

    • Development of a portable light scattering (PLS) device with a rapid integration time of 20ms.
    • Measurement of the particle phase function and asymmetry parameter (g) at small angles (down to 0.7°).

    Main Results:

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    • The PLS device successfully measured asymmetry parameter (g) values for brown carbon aerosol (0.664 ± 0.002), soot (0.506 ± 0.004), and Arizona Road Dust (0.701 ± 0.020).
    • The device achieves an angular resolution an order of magnitude smaller than commercial nephelometers.

    Conclusions:

    • The developed PLS device offers a significant improvement in measuring the asymmetry parameter (g) due to its enhanced angular resolution and real-time capabilities.
    • This technology facilitates more accurate radiative transfer calculations by providing precise aerosol optical property data.