关于温湿度检测的外文翻译

滨州学院毕业设计（论文）开题报告题目基于单片机的粮库温湿度智能检测系统的研究系（院）物理与电子科学系年级2009级专业电子信息科学与技术班级1班学生姓名董乃旭学号2009010551指导教师李洁职称讲师滨州学院教务处二〇一三年三月AnAutomaticMeasuringSystemBasedonAtmosphericalMeasurementUsedforTemperatureRelayFortemperaturerelay,itisveryimportanttomeasureitstemperaturesforactionandreversion.Inthispaper,anautomaticmeasuringsystembasedonatmosphericalmeasurementisdiscussed,whichisverysimpleandpreciseinpracticalapplication.Inatmosphericalmeasurement,itiscrucialtodesignafavorabletemperaturefield.Theresistancestoveisdesignedforsimulatingtemperaturefield.Theeventemperatureisimprovedbylong-timewarm-upandplacingorifice-boardintestingroom.Accordingtotheenactmentcontrollingtemperaturecurve,thealgorithmoffuzzycontrolisusedtocontrolthetemperatureintemperaturefield.Theregulatingvoltagemodeofdouble-directionBi-directionalthyristorsisusedforcontrollingtemperature.Thesystemconsistsoftheconsoleandtheresistancestove，andtheconsoleincludessoftwareplatformandhardwareplatform.Inthissystem,Themethodofgroupingtheresistancewireofresistancestoveaccordingtothepowerisputforward,andtheperformanceofresistancestoveisimprovedbasedonthismethod.Themeasuringprecisionisimprovedbyusingtheminimumtwo-multiplicationtocalibratetheerror.Atpresent,thesystemhasbeenpracticallyappliedinmanufacture,whichhasgainedobviouseconomybenefitandwillbewidelyappliedinthefuture.1.IntroductionThetemperaturerelayisoneofcommonrelays,whichtakesactionwhentheoutsidetemperaturearrivesatthegiventemperature.Thetemperaturerelayperformslotsoffunctions,suchastemperaturecontrol,firealarm,automaticignition,wiringheat-protection,soitiswidelyusedinscientificresearch,industryanddefenseindustryetc.Fortemperaturerelay,itisveryimportanttomeasureitstemperaturesforactionandreversion.Butinthecurrentmanufacture,themanualmeasuringmethods,suchasspot-checkmethod,mercuricthermometermethodetc,dominatethemeasuringmethods.Howevertherearesomeinescapableshortcomingsinthesemethods,suchaslowefficiency,largelaborintensityandbadprecisionetc.Thusmeasurementhasbecomethebottleneckofthequalityoftemperaturerelay.Withtheperpetualprogressinthetechnology,theneedforproductqualitygetsmoreandmorestrictandthedegreeinmanufactureautomatizationgetsmoreandmoredeep.Fortemperaturerelay,todaythemanualmeasuringmethodshavebecomeunfittedfortheneedformanufactureandwillbenecessarilyreplacedbytheautomaticmeasuringmethods.Inthispaper,anautomaticmeasuringsystembasedonatmosphericalmeasurementisdiscussed,whichisverysimpleandpreciseinpracticalapplication.2.MeasuringprincipieTwokindsofmetalswhoseinflatedcoefficientmakeagreatdealofdifferencearehardcomposedtogether,andthenthedishingtwin-sheetmetalcomesintobeing.Whenthetemperaturerelayarrivesatacertaingivenvalue,oneupwardcurvingforcewillcomeintobeingintwin-sheetmetalasaresultofbigexpandingfornethermetalandsmallexpandingforuppermetal.Whenthetwin-sheetmetalbendsatacertainextent,itwilldrivetheelectriccontactandswitchonorswitchoffthecircuit.Whenthetemperaturerelayreducesatacertaingivenvalue,thetwin-sheetmetalgraduallyinvolutes.Whenthetwin-sheetmetalresumesatacertainextent,itwill3rdInternationalSymposiumonInstrumentationScienceandTechnologyAug.18~22,2004,Xi’an.Chinadrivetheelectriccontactininversedirectionandswitchonorswitchoffthecircuit.Theworkingprincipleofdishingtwin-sheetmetalisdescribedasFig1:1-theinitiatorystate(roomtemperature),2-thestateafterheatedorcooled,3-displacement.Thetemperaturerelaytakesactionduetotherisingofambiencetemperatureortheheatingofpassingcurrent.Theresistanceofrelayisverysmall.Socomparedwiththetemperaturerisingcausedbyambiencetemperature,thetemperaturerisingcausedbycurrentheatingalsoisverysmallandcanbeignored.Thusmeasuringtemperaturesforactionandreversionisimplementedbycontrollingtheenvironmenttemperature.Therearethreemethodsformeasuringtemperaturesforactionandreversion,whichareliquidmeasurement,atmosphericalmeasurementandtesting-blockmeasurementinGJB1517-92Totalcriterionforconstanttemperaturerelay.[1]LiquidMeasurementIntheconstanttemperaturetroughwhosetemperaturecanbeintercalated,themediumthatiswateroroilisequablychurnedup.Themeasuringmethodisthattheproductisplacedintheconstanttemperaturetroughheatedorcooled.Becausetheliquidisequablychurnedup,theeventemperature,goodandthetemperatureprecisionisfairlyhighinwhichthetemperatureerroristhetemperaturefluctuatingdegreeis±0.3℃.Thustheheatingcoherenceoftheproductsthatareplacedindifferentpositionintheconstanttemperaturetroughisverygood,themeasuringprecisionisveryhighandtheparameter-repeatingqualityisallright.Butthismethodisjustappliedinsealedtemperaturerelayandtheoilcanstaintheproduct.Sofewmanufactureradoptsthemethod.Onlythedisputedappearsandprecisemeasurementisneeded,themethodisadopted.[2]AtmosphericalMeasurementTheelectricalovenwhosetemperaturecanbeintercalatedequablychurnsuptheatmosphere.Themeasuringmethodisthattheproductisplacedintheelectricalovenheatedorcooled.Inthetemperaturefield,theeventemperaturethatis±2℃andthetemperatureprecisioninwhichthetemperatureerroris±2℃andthetemperaturefluctuatingdegreeis±1.5℃arebothnotgood.Theheatingco