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Research Output 2009 2019

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2019

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

Humphries, G. S., Roy, R., Black, J. D., Lengden, M. & Burns, I. S., 30 Apr 2019, In : Applied Physics B: Lasers and Optics. 125, 4, 6 p., 60.

Research output: Contribution to journalArticle

Open Access
File
soot
fiber lasers
repetition
pulsed lasers
incandescence

Performance analysis of a novel pyroelectric device for non-dispersive infra-red CO2 detection

Wilson, D., Phair, J. W. & Lengden, M., 1 Aug 2019, In : IEEE Sensors Journal. 19, 15, p. 6006-6011 6 p.

Research output: Contribution to journalArticle

Open Access
File
Temperature sensors
Infrared radiation
Measurement errors
Sensors
temperature sensors
2018

A new RAM normalized 1f-WMS technique for the measurement of gas parameters in harsh environments and a comparison with 2f/1f

Upadhyay, A., Lengden, M., Wilson, D., Humphries, G. S., Crayford, A. P., Pugh, D. G., Johnson, M. P., Stewart, G. & Johnstone, W., 27 Nov 2018, In : IEEE Photonics Journal. 10, 6, 12 p., 6804611.

Research output: Contribution to journalArticle

Open Access
File
Random access storage
Modulation
Spectroscopy
modulation
Wavelength
2017
7 Citations (Scopus)
Open Access
File
Distributed feedback lasers
Surface emitting lasers
Modulation
Spectroscopy
Calibration
3 Citations (Scopus)

Constrained models for optical absorption tomography

Polydorides, N., Tsekenis, A., Fisher, E., Chigine, A., McCann, H., Dimiccoli, L., Wright, P., Lengden, M., Benoy, T., Wilson, D., Humphries, G. & Johnstone, W., 23 Oct 2017, In : Applied Optics. 57, 7, p. B1-B9 9 p.

Research output: Contribution to journalArticle

Open Access
File
optical absorption
tomography
projection
pencil beams
image reconstruction
1 Citation (Scopus)

Measurement of CO2 concentration and temperature in an aero engine exhaust plume using wavelength modulation spectroscopy

Benoy, T., Wilson, D., Lengden, M., Armstrong, I., Stewart, G. & Johnstone, W., 1 Oct 2017, In : IEEE Sensors Journal. 17, 19, p. 6409-6417 9 p.

Research output: Contribution to journalArticle

Open Access
File
Exhaust systems (engine)
plumes
engines
Modulation
Spectroscopy
2016
1 Citation (Scopus)

Application of continuous-wave cavity ring-down spectroscopy to laminar flames

Humphries, G. S., Burns, I. S. & Lengden, M., 12 Jan 2016, In : IEEE Photonics Journal. 8, 1, 10 p., 3900110.

Research output: Contribution to journalArticle

Open Access
File
continuous radiation
flames
Spectroscopy
cavities
rings
6 Citations (Scopus)
Open Access
File
Laser spectroscopy
Amplitude modulation
laser spectroscopy
line shape
Semiconductor lasers
5 Citations (Scopus)
Open Access
File
Distributed feedback lasers
distributed feedback lasers
line shape
recovery
Modulation
6 Citations (Scopus)

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Tsekenis, S., Wilson, D., Lengden, M., Hyvonen, J., Leinonen, J., Shah, A., Andersson, O. & McCann, H., 4 Apr 2016, In : Flow Measurement and Instrumentation. 10 p.

Research output: Contribution to journalArticle

Open Access
File
Methane
Engine cylinders
Tomography
engines
Engine
2015
7 Citations (Scopus)

A simple photoacoustic method for the in situ study of soot distribution in flames

Humphries, G. S., Dunn, J., Hossain, M. M., Lengden, M., Burns, I. S. & Black, J. D., 1 Jun 2015, In : Applied Physics B: Lasers and Optics. 119, 4, p. 709-715 7 p.

Research output: Contribution to journalArticle

Open Access
File
soot
flames
elastic waves
incandescence
laser heating
11 Citations (Scopus)

Miniaturized photoacoustic trace gas sensing using a raman fiber amplifier

Bauer, R., Legg, T., Mitchell, D., Flockhart, G. M. H., Stewart, G., Johnstone, W. & Lengden, M., 15 Sep 2015, In : Journal of Lightwave Technology. 33, 18, p. 3773-3780 9 p.

Research output: Contribution to journalArticle

Open Access
File
Fiber amplifiers
Photoacoustic effect
Photoacoustic spectroscopy
Seed
Stimulated Brillouin scattering
2013
8 Citations (Scopus)

Tunable diode laser based concentration measurements of water vapour and methane on a solid oxide fuel cell

Lengden, M., Cunningham, R. & Johnstone, W., 1 May 2013, In : Journal of Lightwave Technology. 31, 9, p. 1354 - 1359 7 p.

Research output: Contribution to journalArticle

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Water vapor
Semiconductor lasers
water vapor
2011
36 Citations (Scopus)
laser spectroscopy
line shape
recovery
diodes
modulation
2010
14 Citations (Scopus)

Detection of CH4 in the mid-IR using difference frequency generation with tunable diode laser spectroscopy

Armstrong, I., Johnstone, W., Duffin, K., Lengden, M., Chakraborty, A. L. & Ruxton, K. C., 15 May 2010, In : Journal of Lightwave Technology. 28, 10, p. 1435-1442 8 p.

Research output: Contribution to journalArticle

laser spectroscopy
diodes
methane
wavelengths
34 Citations (Scopus)

Tunable diode laser spectroscopy with wavelength modulation: elimination of residual amplitude modulation in a phasor decomposition approach

Ruxton, K. C., Chakraborty, A. L., Johnstone, W., Lengden, M., Stewart, G. & Duffin, K., 21 Sep 2010, In : Sensors and Actuators B: Chemical. 150, 1, p. 367-375 9 p.

Research output: Contribution to journalArticle

Laser spectroscopy
Amplitude modulation
laser spectroscopy
Semiconductor lasers
elimination
2009
39 Citations (Scopus)

Elimination of residual amplitude modulation in tunable diode laser wavelength modulation spectroscopy using an optical fiber delay line

Chakraborty, A. L., Ruxton, K. C., Johnstone, W., Lengden, M. & Duffin, K., Jun 2009, In : Optics Express. 17, 12, p. 9602-9607 6 p.

Research output: Contribution to journalArticle

delay lines
elimination
optical fibers
semiconductor lasers
modulation