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ID:16320722
大小:51.00 KB
页数:9页
时间:2018-08-09
《翻译原文(公交车投币监测系统的研究)(1)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、ApplicationofElectromagneticMaterialSensorBostonRonaldW.GamacheOElectromagneticMaterialPropertiesSensorAbstractRecentresearchconductedbytheauthorhasshownthatelectromagneticsensorscanbeutilizedtodetermineselectedpropertiesofheterogeneousmaterialmixturescontainingwaterbyobservingthemanifestation
2、sofsurfacepolarizationeffectsthatoccurintheradiofrequencyportionoftheelectromagneticspectrum.Forexample,thedensityandwatercontentofengineeringsoilscanbedeterminednon-invasivelyusingthismethod.Especiallychallengingisthedesignofelectromagneticsensorsthatdonotrequirepenetratingprobestoperformthem
3、easurement.Probedeploymentistimeconsumingandsubjecttotechnicalandoperatorerrorsources.Surfacemeasuringsensors,however,maybephysicallylargeandsubjecttomaterialsurfaceeffects(flatnessandroughness).Inaddition,sensorsthatmeasurefromthesurfacesamplethemeasurementvolumenon-uniformly,withthegreatests
4、ensitivitybeingnearthesurface.Therefore,ifthemeasuredpropertyexhibitsasignificantvariationwithdepth,thesensormustmeasurethisvariationinordertoproduceanaccuratemeasurement.Finally,thelargesizeofthesensors,combinedwiththerequiredoperatingfrequencyrange,mayintroduceundesirableresonanceandtransmis
5、sionlineeffectsthatcanrenderthesensornon-functionalincriticalfrequencyranges.Priortotheavailabilityofmultiphysicsfiniteelement(FEM)orfinitedifference(FD)modelingtoolsandsufficientdesktopcomputerhorsepower,sensordesignwasconductedusingad-hoctrialanderrormethods.Costofdevelopmentandtimetomarketw
6、erehighandresultsweregenerallyfarfromoptimum.Toproperlymodelanelectromagneticsensorforsoildensitymeasurement,fullelectromagneticmodespluscoupledheattransferwererequired.Asthesensorgeometrygenerallyconsistsofelementswithverylargeaspectratios,challengesexistwithcreationofstablemeshesandsolutions
7、.Inthispaper,acasestudyintheuseofamulti-physicsFEMmodelingprogram(COMSOLMultiphysics)todesignandoptimizeasensorformeasuringthedensityofanengineeringmaterialwillbedescribed.Issuessuchasdepthofmeasurement,sensitivity,andsensorelectricalch
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