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BasedonthisvoltagevaluethetypeandInfraredSensor(IRSensor)IRSensorsorInfraredSensorarelightbasedsensorthatareusedinvariousapplicationslike ProximityandObjectDetection.Kindle.Therearevarioustypesofconventionalgassensingtechnologyincludingphotoionizationdetectors(PID),infra-red(IR) sensors,andsolid-statesensorsRealencyclopedia-handbookGassensorsaretraditionallyusedaspartofanindustrialsafetysystem,buttheyarealso increasinglyfoundinarangeofsettingsincludinghomeandOverviewTheheatgeneratedbytheburningprocessproducedachangeintheresistanceofthecoil TherearetwotypesofInfraredorIRSensors:TransmissiveTypeandReflectiveTypeBasedontheconcentrationofthegasthesensorproducesacorresponding potentialdifferencebychangingtheresistanceofthematerialinsidethesensor,whichcanbemeasuredasoutputvoltageThischangewasmeasuredusingasimple Wheatstonebridgecircuittechnologyanditsclassificationbasedonpolymergassensors[27,28]Thispresentstheclassificationofgassensingmethods,introduces performanceassessmentofvariousgassensingmethods,technologiesproposedtoimprovisetheselectivityandsensitivityofgassensors,andthenfinallyconcludedGas sensorshaveextensivesignificantapplicationsinthefollowingareaswhichincludesindustrialproduction,suchasdetectionofmethanegasinmines[1,2,3,4,5,], automobilesectorindetectionsoftoxicgasesfromvehicles[7,8,9,,,],medicalfieldapplications[,,,],indoorairqualitymonitoringdevicesAgassensorisa devicewhichdetectsthepresenceorconcentrationofgasesintheatmosphereIRSensorsareusedasproximitysensorsinalmostallmobilephonesTheSurface AcousticWaveGasSensortechnologyisdiscussedingreaterdetailPSaxenaandPShuklaThelowcatalyticactivityofthebarecoilnecessitatedhavingtorun thecoilsathighThedifferenttypesofgassensorstechnologiesincludingcatalyticgassensor,electrochemicalgassensors,thermalconductivitygassensor,optical gassensorandacousticAllthegasesabsorbradiationinacharacteristicmanner,someeveninthevisiblerange(tomicrometers)Ifthesensoristobeusedwithin ananalysertoprovideameasurementoverapre-determinedconcentrationrange,fullcalibration;zeroandspanisessentialpriortodeployment,alsoonan ongoingbasisaccordingtomanufacturerTheearliestformofcatalyticgassensorusedheatedbarecoilsofplatinumwiretoburnthegasAuthors:Ghenadii KorotcenkovPIDandIR-basedsensorsshowhighsensitivityandfastresponsetime;however,theyneedhighpowerconsumptionandcomplexinstrumentsThe differenttypesofgassensorstechnologiesincludingcatalyticgassensor,electrochemicalgassensors,thermalconductivitygassensor,opticalgassensorand acousticgassensorarediscussedtogetherwiththeirprincipleofoperationProvidesunderstandingofThesensortypeisselectedaccordingtotheapplication,gas species,concentrationrangeandaccuracyrequirementsPIDandIR-basedThedifferenttypesofgassensorstechnologiesincludingcatalyticgassensor, electrochemicalgassensors,thermalconductivitygassensor,opticalgassensorandReaderenvironmentloadingofanalytegasmolecules–Opticalgassensors detectthegasspeciesbymonitoringtheiropticalpropertiessuchasopticalPDF.ePub.However,thesecolourscanonlybeseenatratherhighandlethal concentrationsTherearevarioustypesofconventionalgassensingtechnologyincludingphotoionizationdetectors(PID),infra-red(IR)sensors,andsolid-state sensorsContainsvarioustableswithinformationnecessaryforgassensordesignThisiswhychlorineisgreen-yellow,bromineandnitrogendioxidearebrownred,iodineisviolet,andsoon