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基于铂电阻Pt100的高精度温度测控系统设计.docx

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基于铂电阻Pt100的高精度温度测控系统设计 Abstract Temperaturemeasurementandcontrolisanimportantaspectofmanyindustrialprocesses.Theuseofplatinumresistancethermometers(Pt100)hasbecomeincreasinglywidespreadformeasuringtemperatureinindustrialandscientificsettings,duetotheirhighaccuracyandstability.Inthispaper,wewillpresentthedesignofahigh-precisiontemperaturemeasurementandcontrolsystembasedonPt100resistancethermometers.Thesystemisdesignedtomeasuretemperaturevariationswitharesolutionof0.1°Candmaintainatemperaturestabilityof±0.1°C. Introduction Controllingtemperatureisanimportantaspectofmanyindustrialprocesses,includingchemicalreactions,materialprocessing,andfoodproduction.Temperaturemeasurementandcontrolhavebecomeessentialrequirementsinthesefields,andtheuseofhigh-precisionsensorssuchasPt100resistancethermometershasbecomeincreasinglywidespread.TheaccuracyandstabilityofPt100resistancethermometersmakethemhighlysuitableforuseinscientificandindustrialsettings.Inthispaper,wewillpresentthedesignofahigh-precisiontemperaturemeasurementandcontrolsystembasedonPt100resistancethermometers. Design ThesystemconsistsofaPt100resistancethermometerprobe,asignalamplifier,adataacquisitionsystem,andatemperaturecontroller.ThePt100resistancethermometerisapassivetemperaturesensorthathasaresistanceof100Ωat0°C.Asthetemperatureincreases,theresistanceofthesensorincreasesatarateof0.39Ω/°C.ThesignalfromthePt100sensorisamplifiedbyasignalamplifier,whichisdesignedtoprovidehigh-precisionamplificationofthesensorsignalandhighinputimpedance.Theamplifiedsignalisthenregisteredbyadataacquisitionsystem,whichsamplesthesignalatahighrateandconvertsittoadigitalsignal.Thedigitizedsignalisfurtherprocessedbyamicro-controller,whichcalculatesthetemperaturebasedontheresistanceofthesensorandappliestheappropriatecontrolactiontomaintainthedesiredtemperature. Thesystemisdesignedtooperatewitharesolutionof0.1°C,whichisachievedbyusinga24-bitADCinthedataacquisitionsystem.ThetemperatureiscalculatedbasedontheresistanceofthesensorusingtheCallendar-Va