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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,regardlessofi
2、ntheindustry,theagriculture,thescientificresearch,thenationaldefenseandpeople'sdailylifeeachaspect,thetemperaturesurveyandthecontrolallistheextremelyimportantwiththeelectronictechnologyandthematerialssciencedevelopment,toeachkindofnewthermalelementandthetemperaturesensorreq
3、ueststructureadvanced,theperformanceisstable,satisfiesthemoreandmorehighrequestwhichproposedtothetemperaturesurveyandthecontrol.SensorclassificationcarriesonclassifiedresistancetypePNaccordingtothemanufacturetemperaturesensormaterialandtheprincipleofworktotiethetypethermoel
4、ectricitytyperadiationformularoperatingregionisreferstotheresistancevaluetohavetheremarkablechangetemperaturesensoralongwiththetemperaturechange,itmaytransformdirectlythetemperatureastheelectricaltheoperatingtemperaturescope,itsresistancethewhichincreasesalongwiththetempera
5、tureascensioniscalledpositivetemperaturecoefficient(PTC);Itsresistancenumberthewhichreducesalongwiththetemperaturetascensioniscallednegativetemperature(NTC);Thenegativetemperaturewhichreducessuddenlyalongwiththetemperatureriseiscalledcritical(CTR)inawarmareainternalresistan
6、ce.1.PTCprincipleofthePTCrusuallytousethe(BaTio3)ceramicmaterial,thepureBaTio3ceramicshavetheextremelyhighelectronicresistivityunderoftenthetemperature,above108Ω·m,thereforeistheinsulator.IfcarriesonthedopinginBaTio3,maycausetheBaTio3semiconductor,forexample:Mixesby0.1%----
7、0.3%rare-earthelement,butcausesittobecomehas0.1underthenormaltemperature----10Ω·mNlineofsemiconductors.HaselectricitysemiconductorBaTio3,whenthetemperatureachievedwhenCurietemperatureT,ittransformsbythetetragonalsystemintothecubicsystem,thistimeitselectronicresistivityleapi
8、ncreasesseveralmagnitudes(103-----107times).Positivetemperaturecoefficientthe(PTC)
