基于TDLAS技术的全量程甲烷检测系统-豆柴文库

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基于TDLAS技术的全量程甲烷检测系统
I.Introduction
Methaneisanimportantgreenhousegas,whichplaysacrucialroleinclimatechange.Accuratedetectionandmonitoringofmethaneconcentrationinvariousindustrial,agricultural,andenvironmentalapplicationsareessential.Tunablediodelaserabsorptionspectroscopy(TDLAS)isanon-invasiveandhighlyaccuratetechniquethathasgainedpopularityinrecentyearsformethanedetection.Inthispaper,wediscussthedevelopmentofafull-rangemethanedetectionsystembasedonTDLAStechnology.
II.TDLASPrinciple
TDLASisalaser-basedtechniquethatmeasurestheabsorptionoflightbyagasatspecificwavelengths.InTDLAS,alaserdiodeistunedtoaspecificwavelength,andtheemittedlightisdirectedthroughthesamplegas.Thelaserlightisabsorbedbythegas,andtheamountofabsorptionisdirectlyproportionaltotheconcentrationofthegasinthesample.Bytuningthelaserdiodetodifferentwavelengths,theabsorptionspectrumofthegascanbeexplored,allowingfortheidentificationandquantificationofspecificgases.
III.DesignofMethaneDetectionSystem
Ourfull-rangemethanedetectionsystemisdesignedusingaTDLAS-basedsensor,whichconsistsofalaserdiode,anopticalsystem,agascell,andadetector.Thelaserdiodeisusedtogeneratelightataspecificwavelength,whichisabsorbedbythesamplegas.Theopticalsystemcollectsthelightthathaspassedthroughthesamplegasanddirectsittothedetector.Thedetectormeasurestheintensityofthetransmittedlight,whichisthenusedtocalculatetheconcentrationofthegas.
ThegascellisanessentialcomponentoftheTDLASsystem,whichisdesignedtoprovidealongopticalpathforthelaserlighttopassthroughthesamplegas.Thegascellismadeofahigh-quality,transparentmaterial,suchasquartz,andissealedatbothendstopreventgasleakage.Thelengthofthegascelliscriticalfortheaccuracyofthemeasurement,anditistypicallyseveralcentimeterstoseveralmeters.
IV.CalibrationandTesting
Tocalibratethemethanedetectionsystem,weusedaknownconcentrationofmethaneinacalibrationgascylinder.Thecalibrationgaswasintroducedintothegascell,andtheTDLASsensorwasusedtomeasuretheconcentrationofmethane.Themeasuredconcentrationwascomparedto