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Updated: Jun 15, 2026

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System
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Particle size measuring device in real time for dense particulate systems.

C W Ho, A B Tveten, P W Chan

    Applied Optics
    |March 4, 2010
    PubMed
    Summary

    A new real-time particle size measuring device for dense systems was developed. It accurately determines particle size distributions even with multiple particles present, significantly increasing concentration limits.

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    Area of Science:

    • Engineering
    • Optical Physics
    • Materials Science

    Background:

    • Accurate particle size measurement is crucial for dense particulate systems.
    • Existing particle sizing instruments struggle with high particle concentrations.
    • Limitations in current technology necessitate advanced measurement techniques.

    Purpose of the Study:

    • To design and evaluate a novel real-time particle size measuring device.
    • To enable accurate particle sizing in dense particulate systems.
    • To overcome the limitations of single-particle sizing methods.

    Main Methods:

    • The device measures the ratio of scattered light at two distinct angles.
    • It processes scattered light pulses, allowing multiple particles in the focal volume.

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    Last Updated: Jun 15, 2026

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  • Real-time data acquisition and analysis are employed.

    • Main Results:

    • The device successfully determined particle size distributions in dense systems.
    • Accurate measurements were achieved with an average of up to 2.5 particles in the focal volume.
    • This represents a significant increase in measurable particle concentration.

    Conclusions:

    • The developed device offers a breakthrough for real-time particle sizing in dense media.
    • It overcomes the concentration limitations of traditional single-particle sizing instruments.
    • This technology has broad applications in industries relying on particulate material characterization.