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1、无锡职业技术学院毕业设计说明书（英文翻译）英文翻译TemperaturehumiditysensorThesensorintypemanysensors,thetemperaturesensorandappliestwoaspectsinitsoutputbothissecondtoandwithitcorrelationtemperatureisanimportantphysicalparameter,heaffectsallphysical,chemistryandbiomedicineprocessmarch,regardlessofintheindustry,t
2、heagriculture,thescientificresearch,thenationaldefenseandpeople'sdailylifeeachaspect,thetemperaturesurveyandthecontrolallistheextremelyimportantwiththeelectronictechnologyandthematerialssciencedevelopment,toeachkindofnewthermalelementandthetemperaturesensorrequeststructureadvanced,theper
3、formanceisstable,satisfiesthemoreandmorehighrequestwhichproposedtothetemperaturesurveyandthecontrol.SensorclassificationcarriesonclassifiedresistancetypePNaccordingtothemanufacturetemperaturesensormaterialandtheprincipleofworktotiethetypethermoelectricitytyperadiationformularoperatingreg
4、ionisreferstotheresistancevaluetohavetheremarkablechangetemperaturesensoralongwiththetemperaturechange,itmaytransformdirectlythetemperatureastheelectricaltheoperatingtemperaturescope,itsresistancethewhichincreasesalongwiththetemperatureascensioniscalledpositivetemperaturecoefficient(PTC)
5、;Itsresistancenumberthewhichreducesalongwiththetemperaturetascensioniscallednegativetemperature(NTC);Thenegativetemperaturewhichreducessuddenlyalongwiththetemperatureriseiscalledcritical(CTR)inawarmareainternalresistance.1.PTCprincipleofthePTCrusuallytousethe(BaTio3)ceramicmaterial,thepu
6、reBaTio3ceramicshavetheextremelyhighelectronicresistivityunderoftenthetemperature,above108Ω·m,thereforeistheinsulator.IfcarriesonthedopinginBaTio3,maycausetheBaTio3semiconductor,forexample:Mixesby0.1%----0.3%rare-earthelement,butcausesittobecomehas0.1underthenormaltemperature----10Ω·mNli
7、neofsemiconductors.HaselectricitysemiconductorBaTio3,whenthetemperatureachievedwhenCurietemperatureT,ittransformsbythetetragonalsystemintothecubicsystem,thistimeitselectronicresistivityleapincreasesseveralmagnitudes(103-----107times).Positivetemperaturecoefficientthe(PTC)
