传感器研发设计 模拟和数字电路 涡流压电电容传感器 AUTOCAD.docx
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传感器研发设计模拟和数字电路涡流压电电容传感器AUTOCAD
Developmentofaminiatureabrasion-detectingdeviceforasmallprecisionlathe
SensorsandActuators
Thispaperdescribesthedevelopmentofaminiatureabrasion-detectingdeviceforasmallprecisionlathe.Thedeviceworksbydetectingtheamplitudeofthefirstnaturalfrequencyofthecuttingtool,whichincreaseswithabrasion.Byemployingasmallunimorphpiezoelectricvibratorasasensorandusinganelectricpowercontrolwithananalogswitch,aminiature,lowpowerdevicefordetectingabrasionisdeveloped.The30 mmby30 mmdevicedoesnotneedaregulatorintheelectricalcircuitandrunscontinuouslyformorethanaweekonacoin-sizedbattery.
Developmentoftemperaturestablechargebasedpiezoelectriccompositequasi-staticpressuresensors
Inthisworkpiezoelectriccompositechargebasedsensorsaredeveloped,aimedatquasi-staticpressuresensororswitchtypeapplications.Theuseofpiezoelectriccompositematerialsallowsformanufacturingrobustdeviceswhichcaneasilybeintegratedwithconventionalpolymerprocessing.Piezoelectriccompositesofleadzirconatetitanate(PZT)andtwotypesofpolymers,polyamide-6(PA6)andaliquidcrystallinethermosettingpolymer(LCT)wereusedtomanufacturesensordevices.Thebehavioroftheoutputsignalofdifferenttypesofsensorswasstudiedwithfocusonbothtemperaturedependenceoftheoutputsignalandthedriftofthesignalwithtime.ThepropertiesofthePA6basedcompositesanddevicesarehighlytemperaturedependentwhiletheoutputsignalofLCTbasedcompositesanddeviceshasaverylowtemperaturedependenceanddrift,evenoutperformingthePZTreferencedevice.Thetemperaturedependenceoftheoutputsignalofthecompositedevicesisdependentonthedeviceconfigurationaswellasthematerialproperties,suchaspolymerpermittivity.ThedriftofthesignalisstronglydependentontheresistivityofthePZT–polymercompositematerialusedinthesensor.
AnewPZTpiezoelectricsensorforgravimetricapplicationsusingtheresonance-frequencydetection
SensorsandActuatorsB:
Chemical
Piezoelectricsensorsmadeofquartz,Pb(Zr,Ti)O3,Pb(La,Zr,Ti)O3,orPb(Zr,Ti,Sn)Oyhaverapidlybeendevelopedrecentlybecauseofthepotentialapplicationsindevicessuchasbiosensors,accelerometers,pressuresensors,andultrasonictransducers.However,thedevelopmentofdeviceswithreducedsizebutwithimprovedsensitivityishighlyimportant.Withthisidea,thestudyaimstodevelopaleadzironatetitanate(PZT)chipasanovelgravimetricbiosensorusingtheresonancefeatureinbiomoleculedetection.ThePZTthinfilmcharacterizedbytheX-raydiffractometer(XRD)hasaperovskitestructure.ThefabricatedPZTsensorwasdesignedwith250 μm × 250 μm-sensingareasofelectrodes,determinedbythemeasuredimpedanceat98.5 MHzfrequency.Themorphologyandcross-sectionofscanningelectronmicroscope(SEM)imagesshowthatthethicknessofthespin-onPZTlayerwasabout500 nmandthecrystalgrainsizewaslessthan50 nm.Moreover,anevaluationcircuitconsistedofaresonancecircuitandafrequency-to-voltagecircuitwasestablishedtodetectbovineserumalbumin(BSA)protein.ThePZTsensor,combinedwithevaluationcircuit,showedahighsensitivityof62.8 Hz cm2/ng.Thedetectionsensitivitywasenhancedby300foldsthanthatoftraditionalquartzcrystalmicrobalance(QCM).
SensorsandActuatorsB:
Chemical化学传感器开发应用项目实例
Inthisstudy,theregioregularpoly(3-hexylthiophene)(rr-P3HT)basedpiezoelectricsensorsweredevelopedandevaluatedtodetectalcoholicvolatileorganiccompounds(VOCs)associatedwithspoiledandSalmonellatyphimuriumcontaminatedpackagedbeefheadspace.Thedropcoatingtechniquewasusedtodepositthinfilmsofrr-P3HTonbothsidesofquartzcrystalmicrobalance(QCM)electrode.TheQCMpolymersensorswerefoundtoproviderepeatableandreproduciblesensorresponsetoalcoholVOCswithafastrecovery(<2 min)atroomtemperature(25 °C).TheprincipalcomponentanalysisonthesensorssensitivitieswasperformedtodiscriminatethesensedalcoholVOCs,namely:
3-methyl-1-butanolfrom1-hexanol.TheQCMpolymersensorsdemonstratedselectiveresponsetolowconcentrationof3-methyl-1-butanol(averageestimatedlowestdetectionlimit(LDL):
4.35 ppm)andto1-hexanol(averageestimatedLDL:
3.20 ppm).The30daysstoragestudyperformedonQCMsensorsshowedidenticalsensitivityresponsesforsensing3-methyl-1-butanoland1-hexanolatlowconcentrations.
Developmentofpiezoelectricacousticsensorwithfrequencyselectivityforartificialcochlea
SensorsandActuatorsA:
Physical物理传感器开发样例
Inthispaper,wereportanovelpiezoelectricartificialcochleawhichrealizesbothacoustic/electricconversionandfrequencyselectivitywithoutanexternalenergysupply.Thedevicecomprisesanartificialbasilarmembrane(ABM)whichismadeofa40 μmthickpolyvinylidinedifluoride(PVDF)membranefixedonasubstratewithatrapezoidalslit.TheABMovertheslit,whichmimicsthebiologicalsystem,isvibratedbyacousticwavesandgenerateselectricoutputduetothepiezoelectriceffectofPVDF.ThewidthofABMislinearlyvariedfrom2.0to4.0 mmalongthelongitudinaldirectionof30 mmtochangeitslocalresonantfrequencywithrespecttotheposition.Adetectingelectrodearraywith24-elementsof0.50 × 1.0 mmrectanglesismadeofanaluminumthinfilmonABM,wheretheyarelocatedinacenterlineoflongitudinaldirectionwiththegapsof0.50 mm.Sincethedevicewillbeimplantedintoacochleafilledwithlymphfluidinfuture,thebasiccharacteristicsintermsofvibrationandacoustic/electricconversionareinvestigatedbothintheairandinthesiliconeoilwhichisamodeloflymphfluid.Theinvitroopticalmeasurementsshowthatthelocalresonantfrequencyofvibrationisvariedalongthelongitudinaldirectionfrom6.6to19.8 kHzintheairandfrom1.4to4.9 kHzinthesiliconeoil,respectively.Sincearesonatingplacevibrateswithrelativelylargeamplitude,theelectricoutputtherebecomeshighandthatattheotherelectrodesremainstobelow.Thus,theelectricvoltagesfromeachelectroderealizethefrequencyselectivity.Furthermore,theeffectofsurroundingfluidonthevibrationisdiscussedindetailbycomparingtheexperimentalresultswiththetheoreticalpredictionsobtainedbytheWentzel–Kramers–Brillouinasymptoticmethod.Thetheoreticalpredictionindicatesthatthesurroundingfluidofthehigherdensityinducesthelargereffectivemassforthevibrationthatresultsinlowerresonantfrequency.Fromthesefindings,thefeasibilityofartificialcochleaisconfirmedbothexperimentallyandtheoretically.
DevelopmentofanElectricalCapacitanceTomographysystemusingfourrotatingelectrodes
Abstract
ThispaperpresentsanElectricalCapacitanceTomography(ECT)sensorschemeconsistingofNsegmentslinkedinfourgroups,treatedassingle,extremelybroadelectrodesforminga4-electrodesensor.Thisconfigurationisrepeatedalongthepipecircumference,selectingdifferentsegmentsinordertoformN/4independent4-electrodeschemes.TheresponseofthissensorisstudiedbymeansofFiniteElementMethod(FEM)-basedsimulations,andtheresultsarecomparedtotheresponseofa12-electrodeconventionalsensor.Theimagereconstructionprovedtohavelowererrorwhenusingthesegmentedsensor,anditislesssensitivetowhitenoiseaffectingthemeasurements.Atomographwith20segmentsbasedonaFPGAcorehasbeendevelopedandtestedusingatestphantom.Resultsshowthathighvaluesofinter-electrodecapacitancesandbetterimagereconstructioncanbeachieved.
Afiniteelementmodelfortheanalysisof3Daxisymmetriclaminatedshellswithpiezoelectricsensorsandactuators 三维线性理论和有限元模型在传感器功能单元设计分析中的应用CompositeStructures
Thispaperpresentsthedevelopmentofasemi-analyticalaxisymmetricshellfiniteelementmodelwithpiezoelectriclayersusingthe3Dlinearelasticitytheory.Thepiezoelectriceffectofthematerialcouldbeusedassensorsand/oractuatorsinwaytocontrolshelldeformation.Inthepresent3Daxisymmetricmodel,theequationsofmotionareexpressedbyexpandingthedisplacementfieldusingFourierseriesinthecircumferentialdirection.Thus,the3Delasticityequationsofmotionarereducedto2Dequationsinvolvingcircumferentialharmonics.Inthefiniteelementformulationthedependentvariables,electricpotentialandloadingareexpandedintruncatedFourierseries.Specialemphasisisgiventothecouplingbetweensymmetricandanti-symmetrictermsforlaminatedmaterialswithpiezoelectricrings.Numericalresultsobtainedwiththepresentmodelarefoundtobeingoodagreementwithotherfiniteelementsolutions.
Optimizedpiezoelectricsensorforaspecificapplication:
DetectionofLambwaves
Abstract
ThisworkisdevotedtothedevelopmentandtheoptimizationofanewpiezoelectricsensorusingLambwavesdestinedtoaerospacestructureshealthmonitoring.Insuchsystems,Lambwavesareusuallyexcitedandreceivedbythinsinglepiezoelectrictransducers.OneofthemostcriticaltasksinhealthmonitoringistoidentifyallthegeneratedLambwavesinordertoeasethedamageestimation.ApossiblesolutionistomeasuretheLambwavesignalatdifferentlocationsalongthepropagationdirection.So,thedevelopmentofadistributedsensingtechnologyusingmetallicmulti-electrodedepositedonapiezoelectricsubstratewasakeyelement,whichbuiltthebridgebetweenthesensorssignalsandthestructuralintegrityinterpretation.
Firstly,thevariousmanufacturestagesofthisnewsensorbythetapecastingtechniquewerereported.Secondly,piezoelec