In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser
Humphries, Gordon S. and Roy, Robert and Black, John D. and Lengden, Michael and Burns, Iain S. (2019) In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser. Applied Physics B: Lasers and Optics, 125 (4). 60. ISSN 0946-2171
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Abstract
We present a photoacoustic technique for in situ sensing of particulates in reacting flows. The method is demonstrated by measuring soot distribution in laminar flat-flames. The excitation source is a high repetition-rate pulsed fibre laser. The resulting acoustic signals are measured using a uni-directional microphone and lock-in amplifier. Based on an Allan-Werle plot, the detection limit is estimated to be a soot volume fraction of 3 parts-per-billion. Fluence curves are presented, showing a plateau region similar to the behaviour typically observed for laser-induced incandescence. A dependence of the photoacoustic signal on pulse repetition rate is also demonstrated.
Author(s): | Humphries, Gordon S. ![]() ![]() | Item type: | Article |
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ID code: | 67160 |
Keywords: | soot measurement, photoacoustic, fibre laser, combustion, laminar flames, Physics, Physics and Astronomy(all) |
Subjects: | Science > Physics |
Department: | Faculty of Engineering > Electronic and Electrical Engineering Faculty of Engineering > Chemical and Process Engineering Strategic Research Themes > Measurement Science and Enabling Technologies |
Depositing user: | Pure Administrator |
Date deposited: | 06 Mar 2019 09:26 |
Last modified: | 07 Dec 2019 04:47 |
Related URLs: | |
URI: | https://strathprints.strath.ac.uk/id/eprint/67160 |
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