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基于电容法的油膜厚度测量技术研究 Abstract: Oilfilmplaysanimportantroleinmanyengineeringapplications.Accurateandreliablemeasurementofoilfilmthicknessisvitalforpredictingtheperformanceandlifetimeoftheequipment.Capacitance-basedoilfilmthicknessmeasurementisanon-invasiveandwidelyusedmethodthathasbeenextensivelyresearchedinrecentyears.Thispaperpresentstherecentresearchadvancementsincapacitance-basedoilfilmthicknessmeasurementtechnology. Introduction: Oilfilmthicknessmeasurementplaysacrucialroleintheperformanceofmanyengineeringapplicationssuchasbearings,gears,andotherrotatingmachines.Theoilfilmpreventsmetal-to-metalcontact,reducingfrictionandwear.Hence,accurateandreliablemeasurementofoilfilmthicknessisnecessarytopredicttheperformanceandlifetimeoftheequipment.Capacitance-basedoilfilmthicknessmeasurementtechnologyisoneofthemostwidelyusedtechniquesthathasbeenstudiedovertherecentyears.Thismethodinvolvesmeasuringthecapacitancechangeinacapacitorwhenoilispresentbetweentheelectrodes.Thecapacitancechangeisthenconvertedintotheoilfilmthicknessmeasurement. Principle: Thecapacitance-basedoilfilmthicknessmeasurementtechnologyisbasedontheprinciplethatthecapacitanceofacapacitorchangeswhenanon-conductivematerial,suchasoil,isintroducedbetweentheelectrodes.Thecapacitanceofaparallel-platecapacitorcanbecalculatedasC=εA/d,whereCisthecapacitance,εisthepermittivityofthedielectricmaterial,Aistheareaofthecapacitorplates,anddisthedistancebetweentheplates.Whenanoilfilmisintroducedbetweentheplates,thepermittivityofthedielectricmaterialchanges,whichleadstoachangeinthecapacitance.Therefore,capacitance-basedoilfilmthicknessmeasurementinvolvesdetectingthecapacitancechangetoinfertheoilfilmthickness. MeasurementTechniques: Capacitance-basedoilfilmthicknessmeasurementtechnologyhasbeenstudiedwidely,andseveralmeasurementtechniqueshavebeenproposedovertheyears.Themostcommonmeasurementapproachinvolvestheuseofprobeswithtwocapacitiveelectrodes.Theelectrodesoftheprobeareplacedonoppositesidesoftheoilfilm,andthecapacitanceismeasured