Design of a fibre optic sequential multipoint sensor for methane detection using a single tunable diode laser near 1666 nm

Shemshad, Javad (2013) Design of a fibre optic sequential multipoint sensor for methane detection using a single tunable diode laser near 1666 nm. Sensors and Actuators B: Chemical, 186 466-477. doi:10.1016/j.snb.2013.06.003


Author Shemshad, Javad
Title Design of a fibre optic sequential multipoint sensor for methane detection using a single tunable diode laser near 1666 nm
Journal name Sensors and Actuators B: Chemical   Check publisher's open access policy
ISSN 0925-4005
1873-3077
Publication date 2013-09-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.snb.2013.06.003
Open Access Status
Volume 186
Start page 466
End page 477
Total pages 12
Place of publication Lausanne, Switzerland
Publisher Elsevier
Language eng
Subject 2504 Electronic, Optical and Magnetic Materials
3105 Instrumentation
3104 Condensed Matter Physics
2508 Surfaces, Coatings and Films
2506 Metals and Alloys
2505 Materials Chemistry
2208 Electrical and Electronic Engineering
Abstract The design of a fibre optic sequential multipoint sensor using a single DFB laser source for measurement of average concentration of methane has been reported. A theoretical model for sequential multipoint sensor is developed. The validation of the sensor is conducted using methane gas cells connected in series via fibre optics to form 2-Cell and 3-Cell networks. The second harmonic detection of wavelength modulation spectroscopy (2f-WMS) is employed. Normalisation of the 2f signals with respect to the laser average intensity and the detector gain is used to correct for transmission variation. The measurements are performed at four laser modulation depths to compare the 2f-WMS signals for the target test conditions. The Q(6) transition of the 2v band of methane near 1666 nm has been selected because the transition is relatively free of interference from water vapour and absorption by other major gases in that region. The sequential multipoint sensor has some unique advantages over the single cell and multiplexed multipoint sensors. These include the average concentration measurements, the use of only a single laser source, a detector, and a fibre optic to connect series of gas cells, no need for multiplexing techniques to distribute the laser intensity among multi gas cells, and relatively simpler data analysis.
Formatted abstract
The design of a fibre optic sequential multipoint sensor using a single DFB laser source for measurement of average concentration of methane has been reported. A theoretical model for sequential multipoint sensor is developed. The validation of the sensor is conducted using methane gas cells connected in series via fibre optics to form 2-Cell and 3-Cell networks. The second harmonic detection of wavelength modulation spectroscopy (2f-WMS) is employed. Normalisation of the 2f signals with respect to the laser average intensity and the detector gain is used to correct for transmission variation. The measurements are performed at four laser modulation depths to compare the 2f-WMS signals for the target test conditions. The Q(6) transition of the 2v3 band of methane near 1666 nm has been selected because the transition is relatively free of interference from water vapour and absorption by other major gases in that region. The sequential multipoint sensor has some unique advantages over the single cell and multiplexed multipoint sensors. These include the average concentration measurements, the use of only a single laser source, a detector, and a fibre optic to connect series of gas cells, no need for multiplexing techniques to distribute the laser intensity among multi gas cells, and relatively simpler data analysis.
Keyword Wavelength modulation spectroscopy
Optical sensor
Tunable diode laser
Sequential multipoint sensor
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
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