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. ORCID logoORCID: https://orcid.org/0000-0002-4579-5471, Roy, Robert ORCID logoORCID: https://orcid.org/0000-0002-8415-6592, Black, John D., Lengden, Michael and Burns, Iain S.
    Item type:Article
    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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