简介:我们建议旋转传感器在一个磁性的头的一个核心基于一个纤维布拉格栅栏(FBG)包装了的新奇非接触,它从圆形的磁性的扶手统治者把介绍紧张变换成旋转信息。一个数学模型为处理一个讯问者获得的数据被造,并且大小的精确性和决定被改变传感器的圆形的磁性的扶手统治者,以及尺寸的半径和时期分析。它在有旋转角度上的理论分析的好一致的试验性的结果表演,和恰当的结果显示从旋转传感器获得的结果与0.998的线性和大约0.01的一个标准错误与真实旋转速度匹配很好。
简介:Weproposeatwin-arraycapacitance(TAC)sensorforthemeasurementofconcentration,velocity,andflowrateofgas-solidtwo-phaseflow.Usingthesensitivitynon-uniformityofaneighboringelectrode,theregionalconcentrationofthecross-sectionwasreconstructeddirectly.Additionally,thefiniteelementmethodwasusedtoanalyzethecapacitanceofthesensorscomposedofadifferentnumberofelectrodes.TACsensorswith4,6,and8electrodeswerefoundtobethebestforregionalconcentrationmeasurements.Basedonthis,the8-electrodetwin-planeelectricalcapacitancetomography(ECT)sensor,the4-electrodeTACsensor,andthe6-electrodeTACsensorwereusedtomeasuretheconcentration,velocity,andflowrateofgranulesingranularflow.TheflowratesmeasuredbyECTandTACwerecomparedwiththeflowrateobtainedbyagravitysensortoverifythemeasurementaccuracy.Experimentsonverticalandinclinedpipelineswithgranularflowwerecarriedout.Wefoundthattheflowrateaccuracyofthe4-electrodeTACisdistinctlybetterthanthatofthe6-electrodeTACintheverticalpipelinewhiletheflowrateaccuracyofthe4-electrodeTACandthe6-electrodeTACweresimilarfortheinclinedpipeline.
简介:Atpresent,boththepointsourceandtheimagingpolarizationnavigationdevicesonlycanoutputtheangleinformation,whichmeansthatthevelocityinformationofthecarriercannotbeextractedfromthepolarizationfieldpatterndirectly.Opticalflowisanimage-basedmethodforcalculatingthevelocityofpixelpointmovementinanimage.However,forordinaryopticalflow,thedifferenceinpixelvalueaswellasthecalculationaccuracycanbereducedinweaklight.Polarizationimagingtechnologyhastheabilitytoimproveboththedetectionaccuracyandtherecognitionprobabilityofthetargetbecauseitcanacquiretheextrapolarizationmulti-dimensionalinformationoftargetradiationorreflection.Inthispaper,combiningthepolarizationimagingtechniquewiththetraditionalopticalflowalgorithm,apolarizationopticalflowalgorithmisproposed,anditisverifiedthatthepolarizedopticalflowalgorithmhasgoodadaptationinweaklightandcanimprovetheapplicationrangeofpolarizationnavigationsensors.Thisresearchlaysthefoundationfordayandnightall-weatherpolarizationnavigationapplicationsinfuture.
简介:Basedonthetheoryforsmallfieldssuperposedonrelativelylargerfieldsinanelectroelasticbody,&theoreticalanalysisisperformedonacircularplatethickness-shearcrystalresonatorsealedinacircularcylindricalshellforpressuremeasurement.Asimpleexpressionisobtainedforpressureinducedfrequencyshiftsintheresonator,whichisexaminedfordesignoptimization.Numericalresultsshowthatthefrequencyshiftsdependlinearlyonthepressure,andthatapressuresensorwithasofteroutershellorasmallerthicknessratioofthecrystalplatetotheoutershellhashighersensitivity.
简介:Inthispaper,aplasmonicsrefractiveindexsensorwiththesemiring-stubsystemcoupledtoabuswaveguideispro-posed.Thestructurecanachievewavelengthbandtunableandultra-sharpFanoresonance.Thecouplingmechanismbetweenthebrightmodeanddarkmodeisinvestigatedindetail,andapparentplasmoninducedtransparency(PIT)isrealizedontheresonancewavelength.Thefullwidthathalfmaximum(FWHM)oftheresonantwavelengthismodulatedbyadjustingthecoupleddistance.Thesensitivityandfigureofmerit(FOM)oftheproposedsensor'canreachupto600nm/RIUand120onthevisibleregion,respectively,andthisperformancecanbehelpfulfordesigningthephotonicintegratedcircuitandopticalcommunication,inaddition,itcanbeappliedforbio-sensing.
简介:Wepresentarapidsystemforpredictingbeeftendernessbymimickingthehumantactilesense.ThedetectionsystemincludesaFSpressuresensor,apowersupplyconversioncircuit,asignalamplifierandaboxinwhichthesampleismounted.AsampleofrawLongissimusdorsi(LD)muscleisplacedinthemeasuringbox;thenarodconnectedtothepressuresensorispressedintothebeefsampletoagivendepth;thereactionforceofthebeefsampleismeasuredandusedtopredictthetenderness.SensoryevaluationandWarner-BratzlerShearForce(WBSF)evaluationofsamplesfromthesameLDmuscleareusedforcomparison.Thenewdetectionsystemagreeswithestablishedprocedure95%ofthetime,andthetimetotestasampleislessthan5minutes.
简介:Anovelbionicswarmintelligencealgorithm,calledantcolonyalgorithmbasedonablackboardmechanism,isproposedtosolvetheautonomyanddynamicdeploymentofmobilessensornetworkseffectively.Ablackboardmechanismisintroducedintothesystemformakingpheromoneandcompletingthealgorithm.Everynode,whichcanbelookedasanant,makesoneinformationzoneinitsmemoryforcommunicatingwithothernodesandleavespheromone,whichiscreatedbyantitselfinnature.ThenantcolonytheoryisusedtofindtheoptimizationschemeforpathplanninganddeploymentofmobileWirelessSensorNetwork(WSN).Wetestthealgorithminadynamicandunconfigurableenvironment.Theresultsindicatethatthealgorithmcanreducethepowerconsumptionby13%averagely,enhancetheefficiencyofpathplanninganddeploymentofmobileWSNby15%averagely.
简介:Anopticalfibersensorforultrathinlayersensingbasedonshort-rangesurfaceplasmonpolariton(SRSPP)isproposed,andthesensingcharacteristicsaretheoreticallyanalyzed.Simulationresultsindicatethatevenforadetectinglayermuchthinnerthanthevacuumwavelength,aresolutionashighas3.7×10-6RIUcanbeobtained.Moreover,anaveragethickness-detectionsensitivityof6.2dB/nmisobtained,whichenablesthesensortodetectthethicknessvariationoftheultrathinlayeruptotensofnanometers.Thesensitiveregionofthicknesscouldbeadjustedbytuningthestructureparameters.
简介:ThroughanisotropicAgovergrowthonthesurfaceofAunanobipyramids(AuNBPs),high-purityandsizecontrolledAgnanorods(Au/AgNRs)areobtainedbyasimplifiedpurificationprocess.ThediametersoftheAu/AgNRsaredeterminedbythesizeoftheas-preparedAuNBPs,andthelengthsoftheAu/AgNRsaretunableusingdifferentamountsofAgprecursorinthegrowthsolution.Surface-enhancedRamanscattering(SERS)studiesusingRhodamine-6G(R6G)asatestmoleculeindicatethattheAu/AgNRshaveexcellentsensingpotential.ThetunableopticalpropertiesandstrongelectromagneticeffectoftheAu/AgNRs,alongwiththeirsuperiorSERSsignalenhancement,showthatAu/AgNRsarepromisingforfurtherapplicationsinplasmonsensingandbiomoleculardetection.
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简介:Anovelamperometricsensorforthedeterminationofnitricoxidewasdevelopedbycoatingpolythionine/nafiononaglassycarbonelectrode.Thissensorexhibitedagreatenhancementtotheoxidationofnitricoxide.Theoxidationpeakcurrentswerelineartotheconcentrationofnitricoxideoverthewiderangefrom3.6×10-7to6.8×10-5mol.L-1,andthedetectionlimitwas7.2×10-8mol.L-1.Experimentalresultsshowedthatthisnitricoxidesensorpossessedexcellentselectivityandlongerstability.NOreleasingfromratkidneywasmonitoredbythissensor.
简介:Inthepaper,theauthorsanalysetherela-tionshipbetweentheelectricalconductivityσofZrO2andthecontentofdopedstabilizingagentbythePositronAnnihilationTechnique,andexplainthechangetendencyofσwiththecontentofstabilizingagent.Theresearchshowsthat"numberofeffectivevacancy"inmaterialisadecisivefactorcausingchangeofσ.
简介:basedonoptimaldesignonthecoreelementofthesensor,awirelessandpassivesurfaceacousticwave(SAW)temperaturesensorintegratedwithIDTagwaspresented.Areflectivedelayline,whichconsistsofatransducerandeightreflectorsonYZLiNbO3substrate.Wasfabricatedasthesensorelement,inwhich,threereflectorswereusedfortemperaturesensing,andtheotherfivewerefortheIDTagusingphaseencoding.Singlephaseunidirectionaltransducers(SPUDTs)andshortedgratingwereusedtostructurethesAWdevice,leadingtoexcellentsignaltonoiseratio(SNR).TheperformanceoftheSAWdevicewassimulatedbythecouplingofmodes(COM)priortofabrication.Usingthenetworkanalyzer,theresponseintimedomainofthefabricated434MHzSAWsensorwascharacterized,themeasuredS11agreeswellwiththesimulatedone,sharpreflectionpeaks,highsignal/noise,andlowspuriousnoisebetweenthereflectionpeakswereobserved.UsingtheradarsystembasedonFSCWasthereaderunit.thedevelopedSAWtemperaturesensorswereevaluatedwirelessly.Excellent1inearityandgoodresolutionof士1℃wereobserved.
简介:Withtheaidofthelatestfiberopticsensingtechnology,parametersinthecureprocessofthermosettingresin-matrixcomposite,suchastemperature,viscosity,voidandresidualstress,canbemonitoredentirelyandefficiently.Inthispaper,experimentresultsofviscositymeasurementincompositecureprocessinautoclaveusingfiberopticsensorsarepresented.Basedonthesensedinformation,acomputerprogramisutilizedtocontrolthecureprocess.Withthistechnology,thecureprocessbecomesmoreapparentandcontrollable,whichwillgreatlyimprovethecuredproductsandreducethecost.