Compact methane sensor using an integrating sphere and interband cascade laser at 3313 nm

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dc.contributor.authorDavis, Nicholas M.
dc.contributor.authorFrancis, Daniel
dc.contributor.authorHodgkinson, Jane
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2023-05-22T11:18:37Z
dc.date.available2023-05-22T11:18:37Z
dc.date.issued2023-04-23
dc.description.abstractWe present a sensor for gas detection utilising an integrating sphere and interband cascade laser for tunable diode laser absorption spectroscopy (TDLAS). Measurements were made of the methane absorption line at 3313 nm using an integrating sphere with an effective pathlength of 70.1 cm. Gas concentrations were estimated from normalised absorption spectra with line fitting to 7 absorption lines within the scan. Testing showed that measurements were linear for methane in synthetic air for concentrations in the range 0-50ppm. With an averaging time of 20 seconds, the noise-equivalent methane concentration was 180ppb (1σ). The system requires minimal alignment, with preliminary measurements indicating the system is insensitive to vibration and misalignment of the laser input. The lack of alignment optics also allows it to be compact (190x170x120mm) and robust.en_UK
dc.description.sponsorshipEngineering and Physical Sciences Research Council (EPSRC): EP/N002520/1, EP/R511511. Natural Environment Research Council (NERC): NE/K008307/1. Royal Society Paul Instrument Fund: PI 120057en_UK
dc.identifier.citationDavis N, Francis D, Hodgkinson J, Tatam RP. (2023) Compact methane sensor using an integrating sphere and interband cascade laser at 3313 nm, Sensors and Actuators B: Chemical, Volume 389, August 2023, Article number 133866en_UK
dc.identifier.eissn1873-3077
dc.identifier.issn0925-4005
dc.identifier.urihttps://doi.org/10.1016/j.snb.2023.133866
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19682
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectTunable diode laser spectroscopyen_UK
dc.subjectTDLSen_UK
dc.subjectIntegrating sphereen_UK
dc.subjectMethaneen_UK
dc.subjectGas detectionen_UK
dc.subjectInterband cascade laseren_UK
dc.titleCompact methane sensor using an integrating sphere and interband cascade laser at 3313 nmen_UK
dc.typeArticleen_UK

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