Influence of scattering and probe-volume heterogeneity on soot measurements using optical pyrometry

Journal Article · Sat Oct 01 04:00:00 EDT 2005 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2004.09.003· OSTI ID:20677708

Murphy, J J; Shaddix, C R ^[1]

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1. Combustion Research Facility, Sandia National Laboratories, P.O. Box 969, Livermore, CA 94550 (United States)

The equations describing radiative emission from soot are reexamined in light of recent measurements showing that scattering by aggregated soot particles is not negligible in the near-infrared region. When measuring soot temperature and concentration using two-color optical pyrometry, emission is usually best approximated by I{sub l}(s)=[1-exp(-k{sub a,l}s)]I{sub b,l}, using an absorption coefficient, k{sub a,l}, determined while taking into account the effects of scattering. This equation gives good results in most practical measurement environments, where scattering-induced contributions to the measured light intensity are approximately balanced by scattering losses. It is also shown that probe-volume heterogeneity biases temperature measurements made with two-color pyrometry toward the higher temperatures in the probe volume. Soot concentration measurements are also biased, reflecting the concentration of hot soot in the probe volume, rather than the mean concentration of hot and cold soot. Methods to minimize these effects are suggested.

• OSTI ID: 20677708
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 143; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ERRORS
NEAR INFRARED RADIATION
PYROMETERS
SCATTERING
SOOT
TEMPERATURE MEASUREMENT