• United Kingdom

19982021
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Research Output 1998 2018

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
6 Citations (Scopus)
Open Access
File
Distributed feedback lasers
Surface emitting lasers
Modulation
Spectroscopy
Calibration

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
3 Citations (Scopus)

Detection of nitrous oxide (N2O) at sub-ppmv using intracavity absorption spectroscopy

Valiunas, J. K., Stewart, G. & Das, G., 1 Feb 2016, In : IEEE Photonics Technology Letters. 28, 3, p. 359-362 4 p.

Research output: Contribution to journalArticle

Open Access
File
nitrous oxides
Nitrous Oxide
Fiber lasers
Absorption spectroscopy
fiber lasers
6 Citations (Scopus)
Open Access
File
Laser spectroscopy
Amplitude modulation
laser spectroscopy
line shape
Semiconductor lasers
4 Citations (Scopus)
Open Access
File
Distributed feedback lasers
distributed feedback lasers
line shape
recovery
Modulation
2015
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
10 Citations (Scopus)
Open Access
File
attenuators
Single mode fibers
Evanescent fields
fibers
Fibers
2014
21 Citations (Scopus)

A 3D-printed miniature gas cell for photoacoustic spectroscopy of trace gases

Bauer, R., Stewart, G., Johnstone, W., Boyd, E. & Lengden, M., 8 Aug 2014, In : Optics Letters. 39, 16, p. 4796-4799 4 p.

Research output: Contribution to journalLetter

Open Access
File
photoacoustic spectroscopy
cells
gases
distributed feedback lasers
collimators
1 Citation (Scopus)
Open Access
File
attenuators
fiber optics
optical fibers
fibers
miniaturization

Near IR tunable diode laser spectroscopy for aero engine research

Benoy, T., Lengden, M., Armstrong, I., Wilson, D., Stewart, G. & Johnstone, W., May 2014.

Research output: Contribution to conferencePoster

cells
gases
photoacoustic spectroscopy
resonators
interrogation

Theoretical and experimental analysis of side-polished fiber optofluidic variable attenuator

Dudus̈, A., Blue, R., Zagnoni, M., Stewart, G. & Uttamchandani, D., 17 Aug 2014, International Conference on Optical MEMS and Nanophotonics. IEEE, p. 67-68 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Single mode fibers
Optical fibers
Wavelength
Fibers

Theoretical and experimental analysis of side-polished fiber optofluidic variable attenuator

Duduś, A. M., Blue, R., Zagnoni, M., Stewart, G. & Uttamchandani, D., 2014, 2014 International Conference on Optical MEMS and Nanophotonics (OMN). Piscataway, NJ.: IEEE, p. 67-68 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Open Access
File
Single mode fibers
Optical fibers
Wavelength
Fibers
2013
Laser spectroscopy
Solid oxide fuel cells (SOFC)
Semiconductor lasers
Engines
Monitoring
2011
18 Citations (Scopus)

Absorption line profile recovery based on residual amplitude modulation and first harmonic integration methods in photoacoustic gas sensing

Li, L., Arsad, N., Stewart, G., Thursby, G. J., Culshaw, B. & Wang, Y., 1 Jan 2011, In : Optics Communications. 284, 1, p. 312-316 5 p.

Research output: Contribution to journalArticle

Photoacoustic effect
Amplitude modulation
Photoacoustic spectroscopy
Gases
recovery

Absorption line profile recovery based on TDLS and MEMS micro-mirror for photoacoustic gas sensing

Li, L., Arshad, N., Stewart, G., Thursby, G., Uttamchandani, D., Culshaw, B. & Yang, YD., 1 Jul 2011, In : Spectroscopy and Spectral Analysis. 31, 7, p. 1814-1818 5 p.

Research output: Contribution to journalArticle

Acetylene
Erbium doped fiber amplifiers
Laser spectroscopy
Photoacoustic effect
laser spectroscopy

Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination

Bain, J. R. P., Lengden, M., Stewart, G., Black, J. & Johnstone, W., 1 Jul 2011, (Unpublished).

Research output: Contribution to conferencePoster

water vapor
sensors
temperature
modulation
test chambers

Fibre lasers for photo-acoustic gas spectroscopy

Stewart, G. & Arsad, N., May 2011. 4 p.

Research output: Contribution to conferencePaper

gas spectroscopy
fiber lasers
modulation
acoustics
photoacoustic spectroscopy
9 Citations (Scopus)

Intra-cavity spectroscopy using amplified spontaneous emission in fiber lasers

Arsad, N., Min, L., Stewart, G. & Johnstone, W., 1 Mar 2011, In : Journal of Lightwave Technology. 29, 5, p. 782-788 7 p.

Research output: Contribution to journalArticle

Open Access
File
spontaneous emission
fiber lasers
cavities
gases
spectroscopy
35 Citations (Scopus)
laser spectroscopy
line shape
recovery
diodes
modulation
43 Citations (Scopus)

Recovery of absolute gas absorption line shapes using tuneable diode laser spectroscopy with wavelength modulation- part 1: theoretical analysis

Stewart, G., Johnstone, W., Bain, J. R. P., Ruxton, K. C. & Duffin, K., 15 Mar 2011, In : Journal of Lightwave Technology. 29, 6, p. 811-821 11 p.

Research output: Contribution to journalArticle

Gas absorption
Laser spectroscopy
laser spectroscopy
line shape
Semiconductor lasers
1 Citation (Scopus)

Towards smart sonar transducers - polarimetric sensing for sonar array compensation

Pierce, S., Flockhart, G., Mcguire, M., Bennecer, A., Hayward, G., Thursby, G., Stewart, G. & Culshaw, B., 15 Sep 2011, p. 1504-1511. 8 p.

Research output: Contribution to conferencePaper

sonar
transducers
sensors
output
acoustics
Laser spectroscopy
Process control
Semiconductor lasers
Water vapor
Methane
2010

External laser intensity modulation basing on MEMS micro-mirror applied to gas sensing

Li, L., Stewart, G., Thursby, G., Arsad, N., Uttamchandani, D., Culshaw, B. & Wang, Y., 2010, Proceedings of SPIE. Ye, T., Han, S., Kameyama, M. & Hu, S. (eds.). Vol. 7657. p. 76570M (Proceedings of SPIE-The International Society for Optical Engineering ; vol. 7657).

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

microelectromechanical systems
mirrors
modulation
actuators
gases
9 Citations (Scopus)
Open Access
File
Near-infrared Spectroscopy
Near infrared spectroscopy
Gases
infrared spectroscopy
Fiber
3 Citations (Scopus)
Photoacoustic spectroscopy
Laser Spectroscopy
Acetylene
Tunable Laser
photoacoustic spectroscopy
34 Citations (Scopus)

Tunable diode laser spectroscopy with wavelength modulation: an overview of current techniques and motivations

Stewart, G., Ruxton, K. C., Chakraborty, A. & Johnstone, W., 23 Aug 2010.

Research output: Contribution to conferenceAbstract

laser spectroscopy
industries
diodes
modulation
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

Diode laser spectroscopy using a calibration free phasor decomposition approach to RAM nulling

Ruxton, K. C., Chakraborty, A. L., McGettrick, A. J., Duffin, K., Johnstone, W. & Stewart, G., 2009, p. 70. 1 p.

Research output: Contribution to conferencePaper

laser spectroscopy
diodes
decomposition
harmonics
lithium niobates

Diode laser spectroscopy using a calibration free phasor decomposition approach with RAM nulling

Ruxton, K. C., Chakraborty, A., McGettrick, A. J., Duffin, K., Johnstone, W. & Stewart, G., Jul 2009, p. 80. 1 p.

Research output: Contribution to conferencePaper

laser spectroscopy
diodes
decomposition
line shape
recovery
1 Citation (Scopus)
Ultrasonic Wave
Fiber Bragg Grating Sensor
Ultrasonic transducers
Ultrasonic waves
Fiber Bragg gratings

Gas sensing based on optical fibre coupled diode laser spectroscopy: a new approach to sensor systems for safety monitoring

Culshaw, B., Johnstone, W., Stewart, G., Duffin, K., Mauchline, I. S. & Walsh, D., Nov 2009, p. 949-958. 9 p.

Research output: Contribution to conferencePaper

File
Optical fiber coupling
Laser spectroscopy
Light sources
Semiconductor lasers
Methane
21 Citations (Scopus)

In-plane integration of polymer microfluidic channels with optical waveguides - a preliminary investigation

Sheridan, A. K., Stewart, G., Ur-Reyman, H., Suyal, N. & Uttamchandani, D. G., Dec 2009, In : IEEE Sensors Journal. 9, 12, p. 1627-1632 6 p.

Research output: Contribution to journalArticle

Optical waveguides
Microfluidics
optical waveguides
Lab-on-a-chip
Waveguides
1 Citation (Scopus)

Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers

Stewart, G. & Arsad, N., 2009, In : Proceedings of SPIE: The International Society for Optical Engineering. 7503, p. 750312-1 - 750312-4 4 p.

Research output: Contribution to journalConference Contribution

Erbium
Spontaneous emission
Fiber Laser
Fiber lasers
erbium
27 Citations (Scopus)

Multiwavelength operation of erbium-doped fiber lasers by periodic filtering and phase modulation

Mirza, M. A. & Stewart, G., 15 Apr 2009, In : Journal of Lightwave Technology. 27, 8, p. 1034-1044 11 p.

Research output: Contribution to journalArticle

Open Access
File
phase modulation
erbium
fiber lasers
modulation
fibers
gas composition
laser spectroscopy
diodes
temperature
4 Citations (Scopus)

Recent advance in tunable diode laser spectroscopy with background RAM nulling for industrial applications

Ruxton, K. C., Chakraborty, A., McGettrick, A. J., Duffin, K. & Stewart, G., 5 Oct 2009.

Research output: Contribution to conferencePaper

laser spectroscopy
line shape
diodes
harmonics
modulation
4 Citations (Scopus)

Recent advance in tunable diode-laser spectroscopy with background RAM nulling for industrial applications

Ruxton, K. C., Chakraborty, A. L., McGettrick, A. J., Duffin, K., Johnstone, W. & Stewart, G., Oct 2009, In : Proceedings of SPIE: The International Society for Optical Engineering. 7503, 750313

Research output: Contribution to journalArticle

Nulling
Laser Spectroscopy
Tunable Laser
Amplitude Modulation
Laser spectroscopy

Recovery of absolute gas absorption lineshapes using TDLS at arbitrary modulation indices

Bain, J. R. P., Stewart, G., Duffin, K., Lengden, M., Ruxton, K. C. & Johnstone, W., Sep 2009.

Research output: Contribution to conferencePaper

laser applications
Germany
recovery
industries
modulation

Recovery of gas absorption lineshapes using TDLS at arbitrary modulation indices

Bain, J. R. P., Stewart, G., Duffin, K., Lengden, M., Ruxton, K. C. & Johnstone, W., Sep 2009.

Research output: Contribution to conferencePoster

recovery
modulation
gases
3 Citations (Scopus)
gas spectroscopy
Erbium
Saturable Absorber
Erbium-doped Fiber
Saturable absorbers
2008

Calibration free, optical measurements of gas composition for industrial process control in harsh environments

Johnstone, W., McGettrick, A. J., Duffin, K. & Stewart, G., 2008, (Unpublished).

Research output: Contribution to conferencePaper

gas composition
optical measurement
gas composition
laser spectroscopy
diodes
decomposition
8 Citations (Scopus)

Chemical sensor networks for gas detection and environmental monitoring

Duffin, K., Johnstone, W., McGettrick, A. J., Moodie, D., Stewart, G., Thursby, G. J. & Culshaw, B., Oct 2008, In : Current Analytical Chemistry. 4, 4, p. 391-402 11 p.

Research output: Contribution to journalArticle

Chemical sensors
Sensor networks
Gases
Semiconductor lasers
Monitoring
38 Citations (Scopus)

Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers

Mirza, M. A. & Stewart, G., Oct 2008, In : Applied Optics. 47, 29, p. 5242-5252 10 p.

Research output: Contribution to journalArticle

fiber lasers
filters
birefringence
wavelengths
output
5 Citations (Scopus)
Laser Spectroscopy
Tunable Laser
Laser spectroscopy
Diode Laser
Fiber Laser
37 Citations (Scopus)

Tunable diode laser spectroscopy for industrial process applications: system characterization in conventional and new approaches

Johnstone, W., McGettrick, A. J., Duffin, K., Cheung, A. & Stewart, G., Jul 2008, In : IEEE Sensors Journal. 8, 7, p. 1079-1088 10 p.

Research output: Contribution to journalArticle

Laser spectroscopy
laser spectroscopy
Semiconductor lasers
diodes
Amplitude modulation
53 Citations (Scopus)

Tunable diode laser spectroscopy with wavelength modulation: a phasor decomposition method for calibration-free measurements of gas concentration and pressure

McGettrick, A. J., Duffin, K., Johnstone, W., Stewart, G. & Moodie, D. G., 15 Feb 2008, In : Journal of Lightwave Technology. 26, 4, p. 432-440 9 p.

Research output: Contribution to journalArticle

laser spectroscopy
diodes
modulation
decomposition
gases