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Applied Optics

Applied Optics


  • Vol. 11, Iss. 9 — Sep. 1, 1972
  • pp: 2082–2087

Single-Particle Light–Scattering Measurement: Photochemical Aerosols and Atmospheric Particulates

David T. Phillips and Philip J. Wyatt  »View Author Affiliations

Applied Optics, Vol. 11, Issue 9, pp. 2082-2087 (1972)

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The use of single-particle light-scattering measurements to determine the origin of atmospheric hazes has been explored by measurement of laboratory aerosols, field samples, and computer analysis of the light-scattering data. The refractive index of measured spherical particles 800 nm to 1000 nm in diameter was determined within 2%. For particles of diameter less than 500 nm the measurement of absolute scattering intensity is required for complete analysis. Distinctive nonspherical and absorbing particles were observed both in automotive exhaust and atmospheric samples. Electrostatic suspension of atmospheric particulates is demonstrated to provide a practical approach to optical measurement of single particles. The technique may be used to calibrate optical particle counters or identify particles with unique shape or refractive index.

© 1972 Optical Society of America

Original Manuscript: February 22, 1972
Published: September 1, 1972

David T. Phillips and Philip J. Wyatt, "Single-Particle Light–Scattering Measurement: Photochemical Aerosols and Atmospheric Particulates," Appl. Opt. 11, 2082-2087 (1972)

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