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

James Roderic Peter Bain, Michael Lengden, George Stewart, John Black, Walter Johnstone

Research output: Contribution to conferencePoster

Abstract

The development of a TDLS-based sensor for determining the temperature of ambient water vapour is described. For the purposes of ground testing, aeroengine intake temperature is typically measured using platinum resistance temperature detectors but under certain conditions these devices become unreliable and an alternative is needed. The sensor requirements are to measure gas temperature over the range of 0-40°C with an absorption path determined by the intake cross section, whilst recording continuously in a harsh environment. Wavelength modulation spectroscopy (WMS) with balanced detection is used to interrogate two water vapour absorption features near 1430nm. The lines can both be accessed by a single DFB laser current scan, yet have good spectral isolation and temperature sensitivity[1-3].

The use of autobalanced noise cancellers[4-6] for stand alone two-line ratio thermometry sensors is investigated. When used in conjunction with second harmonic detection in WMS, the detector bandwidth and dynamic range need to be optimised to ensure any temperature calibration is not susceptible to long-term drift and changing optical conditions. Initial calibration and testing is performed in an environmental chamber with temperature and humidity control.

Conference

Conference8th International Conference on Tunable Diode Laser Spectroscopy
CountrySwitzerland
CityZermatt
Period11/07/1115/07/11

Fingerprint

water vapor
sensors
temperature
modulation
test chambers
detectors
temperature control
gas temperature
wavelengths
spectroscopy
dynamic range
temperature measurement
humidity
isolation
platinum
recording
bandwidth
harmonics
requirements
cross sections

Keywords

  • water vapour sensor
  • temperature detectors
  • laser current scan
  • humidity control

Cite this

Bain, J. R. P., Lengden, M., Stewart, G., Black, J., & Johnstone, W. (2011). Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.
Bain, James Roderic Peter ; Lengden, Michael ; Stewart, George ; Black, John ; Johnstone, Walter. / Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.
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abstract = "The development of a TDLS-based sensor for determining the temperature of ambient water vapour is described. For the purposes of ground testing, aeroengine intake temperature is typically measured using platinum resistance temperature detectors but under certain conditions these devices become unreliable and an alternative is needed. The sensor requirements are to measure gas temperature over the range of 0-40°C with an absorption path determined by the intake cross section, whilst recording continuously in a harsh environment. Wavelength modulation spectroscopy (WMS) with balanced detection is used to interrogate two water vapour absorption features near 1430nm. The lines can both be accessed by a single DFB laser current scan, yet have good spectral isolation and temperature sensitivity[1-3]. The use of autobalanced noise cancellers[4-6] for stand alone two-line ratio thermometry sensors is investigated. When used in conjunction with second harmonic detection in WMS, the detector bandwidth and dynamic range need to be optimised to ensure any temperature calibration is not susceptible to long-term drift and changing optical conditions. Initial calibration and testing is performed in an environmental chamber with temperature and humidity control.",
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Bain, JRP, Lengden, M, Stewart, G, Black, J & Johnstone, W 2011, 'Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination' 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, 11/07/11 - 15/07/11, .

Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination. / Bain, James Roderic Peter; Lengden, Michael; Stewart, George; Black, John; Johnstone, Walter.

2011. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.

Research output: Contribution to conferencePoster

TY - CONF

T1 - Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination

AU - Bain, James Roderic Peter

AU - Lengden, Michael

AU - Stewart, George

AU - Black, John

AU - Johnstone, Walter

PY - 2011/7/1

Y1 - 2011/7/1

N2 - The development of a TDLS-based sensor for determining the temperature of ambient water vapour is described. For the purposes of ground testing, aeroengine intake temperature is typically measured using platinum resistance temperature detectors but under certain conditions these devices become unreliable and an alternative is needed. The sensor requirements are to measure gas temperature over the range of 0-40°C with an absorption path determined by the intake cross section, whilst recording continuously in a harsh environment. Wavelength modulation spectroscopy (WMS) with balanced detection is used to interrogate two water vapour absorption features near 1430nm. The lines can both be accessed by a single DFB laser current scan, yet have good spectral isolation and temperature sensitivity[1-3]. The use of autobalanced noise cancellers[4-6] for stand alone two-line ratio thermometry sensors is investigated. When used in conjunction with second harmonic detection in WMS, the detector bandwidth and dynamic range need to be optimised to ensure any temperature calibration is not susceptible to long-term drift and changing optical conditions. Initial calibration and testing is performed in an environmental chamber with temperature and humidity control.

AB - The development of a TDLS-based sensor for determining the temperature of ambient water vapour is described. For the purposes of ground testing, aeroengine intake temperature is typically measured using platinum resistance temperature detectors but under certain conditions these devices become unreliable and an alternative is needed. The sensor requirements are to measure gas temperature over the range of 0-40°C with an absorption path determined by the intake cross section, whilst recording continuously in a harsh environment. Wavelength modulation spectroscopy (WMS) with balanced detection is used to interrogate two water vapour absorption features near 1430nm. The lines can both be accessed by a single DFB laser current scan, yet have good spectral isolation and temperature sensitivity[1-3]. The use of autobalanced noise cancellers[4-6] for stand alone two-line ratio thermometry sensors is investigated. When used in conjunction with second harmonic detection in WMS, the detector bandwidth and dynamic range need to be optimised to ensure any temperature calibration is not susceptible to long-term drift and changing optical conditions. Initial calibration and testing is performed in an environmental chamber with temperature and humidity control.

KW - water vapour sensor

KW - temperature detectors

KW - laser current scan

KW - humidity control

UR - http://tdls.conncoll.edu/

M3 - Poster

ER -

Bain JRP, Lengden M, Stewart G, Black J, Johnstone W. Development of a TDLS-based ambient water vapour sensor for aeroengine intake temperature determination. 2011. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.