High spatial resolution laser cavity extinction and laser-induced incandescence in low-soot-producing flames

Journal article


Tian, Bo, Gao, Y., Balusamy, S. and Hochgreb, S. 2015. High spatial resolution laser cavity extinction and laser-induced incandescence in low-soot-producing flames. Applied Physics B. 120 (3), pp. 469-487. https://doi.org/10.1007/s00340-015-6156-3
AuthorsTian, Bo, Gao, Y., Balusamy, S. and Hochgreb, S.
Abstract

Accurate measurement techniques for in situ determination of soot are necessary to understand and monitor the process of soot particle production. One of these techniques is line-of-sight extinction, which is a fast, low-cost and quantitative method to investigate the soot volume fraction in flames. However, the extinction-based technique suffers from relatively high measurement uncertainty due to low signal-to-noise ratio, as the single-pass attenuation of the laser beam intensity is often insufficient. Multi-pass techniques can increase the sensitivity, but may suffer from low spatial resolution. To overcome this problem, we have developed a high spatial resolution laser cavity extinction technique to measure the soot volume fraction from low-soot-producing flames. A laser beam cavity is realised by placing two partially reflective concave mirrors on either side of the laminar diffusion flame under investigation. This configuration makes the beam convergent inside the cavity, allowing a spatial resolution within 200 μm, whilst increasing the absorption by an order of magnitude. Three different hydrocarbon fuels are tested: methane, propane and ethylene. The measurements of soot distribution across the flame show good agreement with results using laser-induced incandescence (LII) in the range from around 20 ppb to 15 ppm.

KeywordsSoot Particle, Soot Volume Fraction, Flame Height, Tunable Diode Laser Absorption Spectroscopy, Soot Concentration
Year2015
JournalApplied Physics B
Journal citation120 (3), pp. 469-487
PublisherSpringer Science and Business Media LLC
ISSN0946-2171
1432-0649
Digital Object Identifier (DOI)https://doi.org/10.1007/s00340-015-6156-3
Web address (URL)http://hdl.handle.net/10545/624729
hdl:10545/624729
Publication dates26 Jun 2015
Publication process dates
Deposited24 Apr 2020, 15:07
Accepted05 Jun 2015
ContributorsUniversity of Cambridge
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File Access Level
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