Analysis of inaccuracy induced by intensity variation of a DFB laser in fibre optic multipoint 2f-WMS measurements of methane near 1666 nm

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dc.contributor.authorShemshad, Javad
dc.date.accessioned2025-01-06T17:44:49Z
dc.date.available2025-01-06T17:44:49Z
dc.date.issued2015
dc.description.abstractThe analysis of methane concentration measurement inaccuracy induced by the intensity variation of a DFB laser at 1666 nm in a multipoint fibre optic sensor has been reported. The measurement is based on wavelength modulation spectroscopy (WMS) with second harmonic (2f) detection technique. The 2f signals are normalised to the average laser intensity and the detector gain to eliminate the effect of transmission loss and laser intensity variation on the measurements. The measurements are conducted at two laser intensities, defined as nominated intensity and 73% of the nominated intensity, to quantify the measurements errors due to the intensity change. The experimental results show that a significant change in the laser intensity yields differences in the 2f signals; as a result, errors were induced. A model is developed to quantify the errors in the concentration measurements. The maximum deviations for single cell, 2-Cell, and 3-Cell measurements to the given concentration of 10%, 7.5%, and 5.667% are calculated to be 9.764%, 7.2235%, and 5.368%, respectively. The concentration error increases with the cell number because of the accumulated background transmission loss of the gas cells in 2-Cell and 3-Cell in comparison to a single cell measurement. (C) 2014 Elsevier B.V. All rights reserved.
dc.description.sponsorshipCRCMining Australia
dc.description.sponsorshipThe author would like to thank CRCMining Australia for financial support of the project, the Queensland Quantum Optics Lab for providing facilities, and team of academics and scientists namely Associate Professor Mehmet Kizil, Dr. Saiied Aminossadati, Associate Professor Warwick Bowen, and Dr. Joachim Knittel for consultative and technical supports.
dc.identifier.doi10.1016/j.sna.2014.11.011
dc.identifier.endpage101
dc.identifier.issn0924-4247
dc.identifier.scopus2-s2.0-84919936068
dc.identifier.scopusqualityQ1
dc.identifier.startpage96
dc.identifier.urihttps://doi.org/10.1016/j.sna.2014.11.011
dc.identifier.urihttps://hdl.handle.net/20.500.14669/3193
dc.identifier.volume222
dc.identifier.wosWOS:000349573400012
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Sa
dc.relation.ispartofSensors and Actuators A-Physical
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectWavelength modulation spectroscopy
dc.subjectMethane concentration
dc.subjectFibre optic multipoint sensor
dc.subjectDFB laser
dc.subjectIntensity variation
dc.titleAnalysis of inaccuracy induced by intensity variation of a DFB laser in fibre optic multipoint 2f-WMS measurements of methane near 1666 nm
dc.typeArticle

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