In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser

Gordon S. Humphries; Robert Roy; John D. Black; Michael Lengden; Iain S. Burns

doi:10.1007/s00340-019-7169-0

In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser

Gordon S. Humphries, Robert Roy, John D. Black, Michael Lengden, Iain S. Burns

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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.

Original language	English
Article number	60
Number of pages	6
Journal	Applied Physics B: Lasers and Optics
Volume	125
Issue number	4
Early online date	14 Mar 2019
DOIs	https://doi.org/10.1007/s00340-019-7169-0
Publication status	Published - 30 Apr 2019
Event	8th International Workshop on Laser-Induced Incandescence - Evangelische Akademie, Tutzing, Germany Duration: 10 Jun 2018 → 13 Jun 2018

Keywords

soot measurement
photoacoustic
fibre laser
combustion
laminar flames

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10.1007/s00340-019-7169-0Licence: CC BY 4.0

Humphries-etal-APB-2019-In-situ-photoacoustic-measurement-of-soot-profiles-in-laminar-flamesFinal published version, 935 KBLicence: CC BY 4.0

Cite this

@article{a278a94ebd0c4431a6e3980066653b14,

title = "In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser",

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.",

keywords = "soot measurement, photoacoustic, fibre laser, combustion, laminar flames",

author = "Humphries, {Gordon S.} and Robert Roy and Black, {John D.} and Michael Lengden and Burns, {Iain S.}",

year = "2019",

month = apr,

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doi = "10.1007/s00340-019-7169-0",

language = "English",

volume = "125",

journal = "Applied Physics B: Lasers and Optics",

issn = "0946-2171",

number = "4",

note = "8th International Workshop on Laser-Induced Incandescence ; Conference date: 10-06-2018 Through 13-06-2018",

}

TY - JOUR

T1 - In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser

AU - Humphries, Gordon S.

AU - Roy, Robert

AU - Black, John D.

AU - Lengden, Michael

AU - Burns, Iain S.

PY - 2019/4/30

Y1 - 2019/4/30

N2 - 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.

AB - 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.

KW - soot measurement

KW - photoacoustic

KW - fibre laser

KW - combustion

KW - laminar flames

UR - https://link.springer.com/journal/340

U2 - 10.1007/s00340-019-7169-0

DO - 10.1007/s00340-019-7169-0

M3 - Article

SN - 0946-2171

VL - 125

JO - Applied Physics B: Lasers and Optics

JF - Applied Physics B: Lasers and Optics

IS - 4

M1 - 60

T2 - 8th International Workshop on Laser-Induced Incandescence

Y2 - 10 June 2018 through 13 June 2018

ER -

In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser

Abstract

Keywords

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In-situ Chemical Measurement and Imaging Diagnostics for Energy Process Engineering (Platform Grant)

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In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser

Abstract

Keywords

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Projects

In-situ Chemical Measurement and Imaging Diagnostics for Energy Process Engineering (Platform Grant)

Cite this