Mid-Infrared Methane Sensor System for Natural Gas Leakage Detection and Its Application br
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG（2022）
摘要
ObjectiveMethaneCH4istheprimarycomponentofnaturalgasaccountingformorethan90%ofitCH4isacolorlessodorlessflammableandexplosivegasItisasafetyhazardduringtheproductionandtransportationofnaturalgascoalandoilCH4leakageisdifficulttodetectandcanresultinsuffocationorevendeathWhentheCH4concentrationvolumefractionintheairreachesacertainlimit5%--16%itcancausecombustionandexplosioninthepresenceofaheatsourceoropenfireAccordingtothedatafromtheUSEnvironmentalProtectionAgencyin2020CH4isastrongshort-termgreenhousegaswitharapidwarmingeffectaccountingfor20%ofglobalemissionsrankingsecondonlytocarbondioxideCO2AlthoughCH4existsintheatmosphereforonlyapproximately12yearsitsheatstoragecapacityintheatmosphereis28--34timesthatofCO2ThereforethedevelopmentofaCH4sensorsystemforreal-timemonitoringofCH4concentrationisessentialformitigatingclimatechangefindingthesourcesofnaturalgasleakagequicklyandminimizingthelossoflifeandpropertyMethodsTheselectionofgasdetectiontechnologyisessentialfordetectingtraceconcentrationsofCH4intheatmosphereIntermsoftimeresolutionsizeandcostopticalmethodsbasedonmid-infraredlaserspectroscopyareadvantageousforCH4sensingTunablediodelaserabsorptionspectroscopyTDLASisdemonstratedtobeanexcellenttoolfortracegasdetectionbecauseofitshighsensitivityselectivityandreal-timeperformanceInthispaperamid-infraredCH4sensorsystemisdevelopedbasedonTDLASThelightsourceisaninterbandcascadelaserthatisusedtotargettheabsorptionlineofCH4at30385cm-1Forgasabsorptionenhancementamulti-passgascellwithaneffectiveopticalpathof264misusedToincreasedetectionrangeandsensitivitythewavelengthmodulationspectroscopyWMSschemeisusedTheopticalstructureissimplestableandcompactmakingitidealforvehicle-bornemovementmeasurementAmobilenaturalgasleakagesourcelocationmethodbasedontheLabVIEWdataprocessingplatformalong withthegasturbulencemodelandparticleswarmoptimizationalgorithmisdevelopedVehicle-bornemovementmeasurementandleakagesourcelocationexperimentsareperformedonJilinUniversitycampususingtheCH4sensorsystemtovalidateitspracticalapplicabilityResultsandDiscussionsThemodulationdepthoptimizationexperimentisperformedtooptimizethesensor????sperformanceandtheoptimalmodulationdepthis0235cm-1Fig5ToevaluatethestabilityoftheCH4sensorpureN2ismeasuredforapproximately16minusingtheWMSschemeTheAllanvarianceisusedtocalculatethedetectionlimitoftheCH4sensorbasedonthemeasureddataThedetectionlimitis41x10-9withtheaveragetimeof05sandtheoptimaldetectionlimitis62x10-10withtheaveragetimeof54sFig7TheCH4sensorhastheresponsetimeof192sFig8Theresultsofthevehicle-bornemovementmeasurementexperimentshowthattheatmosphericCH4concentrationrangeis204x10-6--216x10-6Fig9ThefieldtestingisconductedtovalidatetheeffectivenessofthemobilenaturalgasleakagesourcelocationmethodThelocalizationerroris343mConclusionsThisstudydemonstratesapromisingmethodfordetectingtraceCH4concentrationsintheatmosphereandidentifyingthesourceofnaturalgasleakageforfieldapplicationsTheexperimentalresultsdemonstratethattheproposedmethodhaspromisingfutureapplicationinthedetectionofnaturalgasleakage
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关键词
sensors,infrared spectroscopy,gas detection,vehicle-borne movement measurement,leakage source location
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