A technique for determining the spectral refractive indices, size, and number density of soot particles from light scattering and spectral extinction measurements in flames

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90123-7· OSTI ID:7131173

Felske, J D ^[1]; Ku, J C ^[2]

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1. State Univ. of New York, Buffalo, NY (United States). Dept. of Mechanical and Aerospace Engineering
2. Wayne State Univ., Detroit, MI (United States). Dept. of Mechanical Engineering

In this paper, the authors technique is presented that allows the spectral indices, size, and number density of soot particles in flames to be inferred from a combination of single-wavelength light scattering and multiwavelength extinction measurements. In contrast to previous schemes for inferring optical properties, the present approach does not require the introduction of a model for the spectral dispersion of the refractive index; it employs Kramers-Kronig theory instead. When applied to spherical particles, the only approximations involved are the usual ones associated with using Kramers-Kronig theory to analyze actual data, that is, for those spectral regions where experimental data are not obtainable, extrapolations and interpolations must be made. The influence of various spectral extrapolation schemes (required because of the finite spectral width of the transmittance data) is thoroughly investigated.

• Sponsoring Organization: NSF; National Science Foundation, Washington, DC (United States)
• OSTI ID: 7131173
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 91:9; ISSN CBFMA; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
CORRELATIONS
ELECTROMAGNETIC RADIATION
FLAMES
KRAMERS-KRONIG CORRELATION
LASER RADIATION
LIGHT SCATTERING
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
REFRACTIVITY
SCATTERING
SIZE
SOOT