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基于DSP与CPLD的光纤温度检测系统.docx

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基于DSP与CPLD的光纤温度检测系统 1.Introduction Inrecentyears,thedemandfordetectingtemperaturewithhighaccuracyandspeedhasbeenincreasinginvariousfields,suchasaerospace,powerplants,andchemicalindustries.However,conventionaltemperaturesensorssuchasthermocouplesandresistancetemperaturedetectors(RTDs)havelimitationsintermsoftheirmeasurementrange,accuracy,andresponsetime.Toovercometheselimitations,fiberoptictemperaturesensing(FOTS)technologyhasbeendeveloped.FOTSoffersseveraladvantagesoverconventionaltemperaturesensors,includingimmunitytoelectromagneticinterference,highaccuracy,andfastresponsetime. Inthispaper,wepresentadesignofafiberoptictemperaturedetectionsystembasedondigitalsignalprocessing(DSP)andcomplexprogrammablelogicdevice(CPLD)technologies.ThesystememploysaMach-Zehnderinterferometer(MZI)tomeasuretemperaturechangesinthefiberopticcable,andthenusesDSPalgorithmsandCPLDprogrammingtoanalyzeandprocessthemeasuredsignals.Thesystemcandetecttemperaturechangeswithhighaccuracyandspeed,makingitsuitableforvariousindustrialapplications. 2.FiberOpticTemperatureSensingTechnology FOTStechnologyutilizesthetemperature-dependentchangesintheopticalfiber'srefractiveindextomeasuretemperaturechanges.ThereareseveraltypesofFOTStechnologies,suchasfluorescence-based,Ramanscattering-based,andinterferometer-based.Inthispaper,wefocusoninterferometer-basedFOTS.Interferometer-basedFOTSsystemsutilizeanopticalfiberwithaFabry-Perot(FP)cavityoranMZIcavityasasensingelement. TheMZI-basedFOTSsystemconsistsofalasersource,anMZIfiberopticsensor,andaphotodetector.TheMZIsensoriscomposedoftwofiberopticarmswithdifferentlengths,whichareconnectedbyacoupler.Thelaserbeamissplitintotwopaths,whicharethentransmittedthroughthetwofiberopticarms.Thelightineacharmisrecombinedatthecoupler,resultinginaninterferencepattern.Whenthetemperaturechangesinoneofthefiberarms,thephasedifferencebetweenthetwoarmschanges,causingashiftintheinterferencepattern.Theshiftintheinterferencepatterncanbedetectedandanalyzedtodeterminethetemperaturechange. 3.S