Distinguishing between spherical and nonspherical particles by measuring the variability in azimuthal light scattering

Bernd A. Sachweh, William D. Dick, Peter H. McMurry

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Azimuthal variabilities in scattering of monochromatic, circularly polarized light by individual spherical and nonspherical particles were measured using the DAWN-A (Wyatt et al. Appl. Opt. 27:2405–2421, 1988) differential light scattering detector. Measured aerosols included polystyrene latex spheres (PSL), quartz, and sodium chloride particles of 0.576, 0.741, 0.966, and 1.250 μm diameter. Signals from eight detectors at different azimuthal angles at a polar angle of 55° showed that variabilities for nonspherical particles significantly exceeded values for the spherical PSL. The probability that a quartz or sodium chloride particle would be incorrectly identified as a sphere are less than about 5% for all sizes investigated.

Original languageEnglish (US)
Pages (from-to)373-391
Number of pages19
JournalAerosol Science and Technology
Issue number3
StatePublished - 1995

Bibliographical note

Funding Information:
One of the authors (Sachweh) was supported by the Deutsche Forschungsgemeinschaft -DFG-through Research Stipend No. Sa 543/3-1. The A/D board (Im-tee, T512) was provided by the University of Kaiser-slautern, Germany. Dr. Barbara J. Turpin and Mr. Po-Fu Huang assisted with the SEM measurements. In addition, this work was supported by the Electric Power Research Institute through Contract No. EPRI RP2023-11. The DAWN-A used in these measurements was made temporarily available to us through a Memorandum of Agrecmcnt with the Bureau of Mines, Pittsburgh Research Center.


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