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Optical particle sizing for in situ measurements Part 2.

D Holve, S A Self

    Applied Optics
    |March 10, 2010
    PubMed
    Summary

    This study validates an in situ particle sizing counter using known aerosol mixtures under ambient and combustion conditions. The instrument accurately measures particle size distributions, demonstrating its potential for diverse aerosol applications.

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    Area of Science:

    • Aerosol Science and Engineering
    • Particle Characterization
    • Combustion Diagnostics

    Background:

    • Accurate in situ particle sizing is crucial for understanding aerosol behavior and impacts.
    • Previous work (Part 1) detailed the in situ particle sizing counter's design and data processing.
    • Experimental validation under diverse conditions is necessary to establish instrument reliability.

    Purpose of the Study:

    • To experimentally validate the performance of an in situ particle sizing counter.
    • To assess the counter's accuracy in measuring particle size distributions at ambient and combustion temperatures.
    • To evaluate the instrument's potential for analyzing challenging aerosol types.

    Main Methods:

    • Utilized well-characterized monodispersions for ambient temperature calibration and testing.
    • Employed silica beads (1-30 microm) injected into a burner for combustion condition measurements.
    • Applied the unfolding technique from Part 1 to analyze amplitude data and determine size distributions.

    Main Results:

    • Ambient measurements accurately reproduced the known number density vs. particle diameter of input monodispersions.
    • Combustion measurements satisfactorily matched the input size distribution of injected glass bead polydispersions.
    • Error propagation analysis of the inversion scheme was performed.

    Conclusions:

    • The in situ particle sizing counter demonstrates reliable performance across ambient and combustion environments.
    • The instrument shows promise for applications involving high number density, absorbing, and irregular aerosols.
    • Successful validation supports the counter's utility in various scientific and industrial aerosol studies.

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