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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,regardless
2、ofintheindustry,theagriculture,thescientificresearch,thenationaldefenseandpeople'sdailylifeeachaspect,thetemperaturesurveyandthecontrolallistheextremelyimportantwiththeelectronictechnologyandthematerialssciencedevelopment,toeachkindofnewthermalelementandthetemperaturesen
3、sorrequeststructureadvanced,theperformanceisstable,satisfiesthemoreandmorehighrequestwhichproposedtothetemperaturesurveyandthecontrol.SensorclassificationcarriesonclassifiedresistancetypePNaccordingtothemanufacturetemperaturesensormaterialandtheprincipleofworktotiethetyp
4、ethermoelectricitytyperadiationformularoperatingregionisreferstotheresistancevaluetohavetheremarkablechangetemperaturesensoralongwiththetemperaturechange,itmaytransformdirectlythetemperatureastheelectricaltheoperatingtemperaturescope,itsresistancethewhichincreasesalongwi
5、ththetemperatureascensioniscalledpositivetemperaturecoefficient(PTC);Itsresistancenumberthewhichreducesalongwiththetemperaturetascensioniscallednegativetemperature(NTC);Thenegativetemperaturewhichreducessuddenlyalongwiththetemperatureriseiscalledcritical(CTR)inawarmareai
6、nternalresistance.1.PTCprincipleofthePTCrusuallytousethe(BaTio3)ceramicmaterial,thepureBaTio3ceramicshavetheextremelyhighelectronicresistivityunderoftenthetemperature,above108Ω·m,thereforeistheinsulator.IfcarriesonthedopinginBaTio3,maycausetheBaTio3semiconductor,forexamp
7、le:Mixesby0.1%----0.3%rare-earthelement,butcausesittobecomehas0.1underthenormaltemperature----10Ω·mNlineofsemiconductors.HaselectricitysemiconductorBaTio3,whenthetemperatureachievedwhenCurietemperatureT,ittransformsbythetetragonalsystemintothecubicsystem,thistimeitselect
8、ronicresistivityleapincreasesseveralmagnitudes(103-----107times).Positivetemperaturecoefficientthe(PTC)
