Laser-induced incandescence versus photo-acoustics: implications for qualitative soot size diagnostics

R.C. Willems (Corresponding author), P.C. Bakker, N.J. Dam

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Laser-induced incandescence at high-repetition rates can in principle be used to resolve the temporal evolution of soot processes. The intrusive character of this technique, however, requires due care of historical effects associated with multiple exposures of individual soot particles to laser light. On the other hand, repetitive heating and cooling opens up an independent, acoustic detection channel. We illustrate a photo-acoustic soot volume fraction measurement, and show that the comparison to simultaneously recorded laser-induced incandescence provides qualitative information on soot growth. Experiments are performed on a propane-fueled, co-flow stabilized diffusion flame, and signals are collected at varying heights above the burner deck. Results show a clear correlation between the laser-induced incandescence and photo-acoustic signals; small deviations are interpreted as a qualitative indicator for the particle size.

LanguageEnglish
Article number138
JournalApplied Physics B: Lasers and Optics
Volume125
Issue number7
DOIs
StatePublished - 1 Jul 2019

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incandescence
soot
acoustics
lasers
sound detecting and ranging
diffusion flames
burners
propane
repetition
deviation
cooling
heating

Cite this

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abstract = "Laser-induced incandescence at high-repetition rates can in principle be used to resolve the temporal evolution of soot processes. The intrusive character of this technique, however, requires due care of historical effects associated with multiple exposures of individual soot particles to laser light. On the other hand, repetitive heating and cooling opens up an independent, acoustic detection channel. We illustrate a photo-acoustic soot volume fraction measurement, and show that the comparison to simultaneously recorded laser-induced incandescence provides qualitative information on soot growth. Experiments are performed on a propane-fueled, co-flow stabilized diffusion flame, and signals are collected at varying heights above the burner deck. Results show a clear correlation between the laser-induced incandescence and photo-acoustic signals; small deviations are interpreted as a qualitative indicator for the particle size.",
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Laser-induced incandescence versus photo-acoustics : implications for qualitative soot size diagnostics. / Willems, R.C. (Corresponding author); Bakker, P.C.; Dam, N.J.

In: Applied Physics B: Lasers and Optics, Vol. 125, No. 7, 138, 01.07.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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