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Applied Optics

Applied Optics


  • Vol. 43, Iss. 17 — Jun. 10, 2004
  • pp: 3433–3441

Modeling light scattering from Diesel soot particles

Patricia Hull, Ian Shepherd, and Arlon Hunt  »View Author Affiliations

Applied Optics, Vol. 43, Issue 17, pp. 3433-3441 (2004)

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The Mie model is widely used to analyze light scattering from particulate aerosols. The Diesel particle scatterometer, for example, determines the size and optical properties of Diesel exhaust particles that are characterized by the measurement of three angle-dependent elements of the Mueller scattering matrix. These elements are then fitted by Mie calculations with a Levenburg–Marquardt optimization program. This approach has achieved good fits for most experimental data. However, in many cases, the predicted complex index of refraction was smaller than that for solid carbon. To understand this result and explain the experimental data, we present an assessment of the Mie model by use of a light-scattering model based on the coupled-dipole approximation. The results indicate that the Mie calculation can be used to determine the largest dimension of irregularly shaped particles at sizes characteristic of Diesel soot and, for particles of known refractive index, tables can be constructed to determine the average porosity of the particles from the predicted index of refraction.

© 2004 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(290.0290) Scattering : Scattering

Original Manuscript: August 11, 2003
Revised Manuscript: March 5, 2004
Published: June 10, 2004

Patricia Hull, Ian Shepherd, and Arlon Hunt, "Modeling light scattering from Diesel soot particles," Appl. Opt. 43, 3433-3441 (2004)

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