简介:Inthispaper,wepresentahighspeedautofocussystemformicrosystemapplicationsanddesignalook-up-tablebasedautofocusingalgorithmforapplicationswhenatargetobjectisalwaysvisible,e.g.,manufacturingpartswithalignmentfiducials.Weperformanevaluationof24focusmeasurestoverifythatwhichfocusmeasureisthebestforthelook-up-tablebasedmethod.Fromtheevaluation,wefindthattheChebyshevmoments-basedfocusmeasure(CHEB)isthemostsuitable.Furthermore,wealsodevelopalook-up-tablebasedautofocussystemthatusesCHEBasthefocusmeasure.Intrainingphase,weofflineconstructatablefromtrainingimagesofanobjectthatarecapturedatseverallensdistances.Eachentryoftableconsistsoffocusmeasurecomputedfromimageandlensdistance.Inworkingphase,givenaninputimage,thealgorithmfirstcomputesthefocusmeasureandthenfindsthebestmatchfocusmeasurefromthetableandlooksupthecorrespondinglenspositionformovingitintothein-focusposition.Ouralgorithmcanperformautofocusingwithinonly2stepsoflensmoving.Theexperimentshowsthatthesystemcanperformhighspeedautofocusingofmicroobjects.
简介:Anoveldischargedeviceisdesignedonthebasisoftheconfigurationofmicro-hollowcathodedischarge(MHCD).ByusingmanyMHCDsinparallelconnection,amicro-dischargearraycanbeconstructed.Withthemicro-dischargearray,ahigh-pressurehigh-currentdensityglowdischargeplasmascanbeformedtomakeaplasmadisplaypanel(PDP).Anairdischargeexperimentisfinishedwiththedischargedevice.Thestabledirectcurrentglowdischargeisformedunderthepressurefrom20Torrto500Torr.Thevoltage-currentcharacteristiccurveandthedischargephotographarenoted.Thevoltage-currentcharacteristiccurvehasapositivedifferentialresistancecoefficientonthewholedischargerange.Theestimatedcurrentdensityreaches70.1A/cm3,thepowerdensityis3.6×104W/cm3,andtheelectrondensityisintheorderof1013cm-3atp=200TorrandID=10mA.TheexperimentalresultsindicatethatthedesigneddischargedeviceisappropriateforPDP.
简介:Dopedmicro-crystallinesiliconfilmsaredepositedattemperaturesaslowas400℃bythecatalyticchemicalvapordepositionmethodusingasilaneandhydrogengasmixture.ElectricalpropertiessuchasthecarrierconcentrationandtheHallmobilityareinvestigatedforvariousmeasuringtemperatures.Itisfoundthatthegrainsofmicro-crystallinesiliconarepreferentiallyorientedalongthe(220)direction,andthattheHallmobilityislargerthan8cm^2·V^-1·s^-1,thecarrierconcentrationisabout1×10^17cm^-1-1×10^19cm^-3atroomtemperature.
简介:Thepropertyofsiliconmicro-capacitiveaccelerometerisanalyzedanddiscussedbyestablishingthemodelofthesensor,tolayabasisforoptimizationdesignofsensorsystemstructure.Discussedissuesincludethestaticmodelinganddynamicbehaviorofthetwocommnlyusedstructures,i.e.,double-cantileversupportedandfour-beamsupportedstructures,andalsothemeasurementrangeofthesedevices.
简介:恩智浦半导体和微软Windows嵌入式金牌合作伙伴Adeneo公司9月19日共同宣布:微软.NETMicroFramework已被移植,以支持恩智浦广受欢迎的基于ARM7^TM处理器的LPC2000微控制器系列和基于ARM9TM处理器的LPC3180微控制器。由此,嵌入式开发者在设计基于恩智浦LPC2000和LPC3000系列微控制器的解决方案时,将能够利用微软.NET和VisualStudio工具的优点,加速其针对小尺寸、低功耗设备应用的开发。同样地,微软Windows应用开发者也将能够直接选用恩智浦LPC2000和LPC3000微控制器作为其嵌入式应用的开发平台。
简介:Micro-structures3-Dprofilemeasurementisanimportantmeasurementcontentforresearchonmicro-machiningandcharacterizationofmicro-dimension.Inthispaper,anewmethodinvolved2-Dstructuretemplate,whichguidesphaseunwrapping,isproposedbasedonphase-shiftingmicroscopicinterferometry.Itisfitnotonlyforstaticmeasurement,butalsofordynamicmeasurement,especiallyformotionofMEMSdevices.3-Dprofileofactivecombofmicro-resonatorisobtainedbyusingthemethod.Thetheoreticprecisioninout-of-planedirectionisbetterthan0.5nm.Thein-planetheoreticprecisioninmicro-structuresisbetterthan0.5μm.Butattheedgeofmicro-structures,itisonthelevelofmicrometermainlycausedbyimpreciseedgeanalysis.Finally,itsdisadvantagesandthefollowingdevelopmentarediscussed.
简介:AnovelLD-pumpedsingle-frequencymicro-chipgreenlaserispresented.ByusingthecombinationofshortcavityandLoytfilterformedbyRochonprismandKTPcrystal,astablesinglefrequencygreenlaserisobtainedwith60mWoutputat500mWLD-pump.Theoptical-to-opticalconversionefficiencyisabout12%.Theopticalcontactbetweencomponentsofthelaserisadopted.Thislaserhastheadvantagesofacompactstructureandalowcost.
简介:Atpresent,boththepointsourceandtheimagingpolarizationnavigationdevicesonlycanoutputtheangleinformation,whichmeansthatthevelocityinformationofthecarriercannotbeextractedfromthepolarizationfieldpatterndirectly.Opticalflowisanimage-basedmethodforcalculatingthevelocityofpixelpointmovementinanimage.However,forordinaryopticalflow,thedifferenceinpixelvalueaswellasthecalculationaccuracycanbereducedinweaklight.Polarizationimagingtechnologyhastheabilitytoimproveboththedetectionaccuracyandtherecognitionprobabilityofthetargetbecauseitcanacquiretheextrapolarizationmulti-dimensionalinformationoftargetradiationorreflection.Inthispaper,combiningthepolarizationimagingtechniquewiththetraditionalopticalflowalgorithm,apolarizationopticalflowalgorithmisproposed,anditisverifiedthatthepolarizedopticalflowalgorithmhasgoodadaptationinweaklightandcanimprovetheapplicationrangeofpolarizationnavigationsensors.Thisresearchlaysthefoundationfordayandnightall-weatherpolarizationnavigationapplicationsinfuture.
简介:Aneffectivedesignmethodoffreeformmicrolensarrayispresentedforshapingvariedlaserbeamsintoprescribedrectangularillumination.Thevariableseparationmappingisappliedtodesignconcavefreeformsurfacesforconstructingafreeformlensarray.Severaldedicatedexamplesshowthatthedesignedfreeformopticallensarraycanachieveaprescribedrectangularilluminationpattern,especiallywithoutconsideringtheinitialstatesofincidentlaserbeams.Bothhighcollectionefficiencyandgoodspatialuniformitycanbeavailablesimultaneously.Toleranceanalysisisalsoperformedtodemonstratethatthisopticaldevicecanwellavoidfabricatingdifficultyinactualapplications.
简介:Laser-inducedbreakdownspectroscopy(LIBS)hasbeenextensivelyappliedduetothecapabilitiesofreal-time,multi-phaseandmulti-elementanalysis.Withtheadvantages,portableLIBSisinrapiddevelopmentwithgreatpotentialoffieldmeasurements.Inthiswork,aportableLIBSwasdevelopedbya50μJlevellaserforexcitationandanobjectivelensforfocusingorimaging.Elementdetectionwassuccessfullyachievedbythissetup,andalsothemicroscopicobservationcouldbeobtainedwiththemagnificationof350×.ApreliminaryinvestigationwascarriedoutformineralrecognitionbythedevelopedportableLIBS.Theobtainedresultsindicatethattheelementdetectioncombinedwithmicroobservationwasaneffectivewayforrecognizingminerals,especiallyforsimilarmineralidentificationordiscrimination.Itissuggestedthatthemicro-joulelasercouldbealternativeforthecommercialportableLIBS,andtheon-sitemineralorrockrecognitionisapromisingfieldfortheapplication.
简介:Thispaperpresentsalargefieldphase-shiftinginterferencemicroscopeformicro-surfacetopographymeasurement.APZTisusedastheZ-directionalphaseshifter.TheinterferencemicroscopeisthecombinationoftheinfinitytubemicroscopewiththeMirautwo-beaminterferometer.Two-dimensionalprecisionmotorizedstageisalignedasthescanningsystemintheX-andY-directiontoextendthetestsurfacemeasurementrangeto12.5mm×12.5mm.Theminimumdisplacementis0.039μmandtheoverlappedproportionis0.22.Afaststitchingalgorithmisproposedbasedongridmatching.Accordingtothereflectivityofthecoreandtheferrule,theplatewiththetransmission/reflectivityratioof70/30isselectedtobalancetheinterferenceintensity.Theinstrumentisprovedtobevalidbyactualmeasurementoftheendsurfaceofanopticalfiberconnector.
简介:Asimplemethodtofabricateone-dimensional(1-D)andtwo-dimensional(2-D)orderedmicro-andnano-scalepatternsisdevelopedbasedontheoriginalmastersfromopticaldiscs,usingnanoimprinttechnologyandsoftstamps.Polydimethylsiloxane(PDMS)wasusedtoreplicatethenegativeimageofthe1-DgratingpatternonthemastersofCD-R,DVD-RandBD-Ropticaldiscs,respectively,andthenthe1-DpatternononeofthePDMSstampswastransferredtoablankpolycarbonate(PC)substratebynanoimprint.The2-DorderedpatternswerefabricatedbythesecondimprintingusinganotherPDMSstamp.Different2-DperiodicpatternswereobtaineddependingonthePDMSstampsandtheanglebetweenthetwotimesofimprints.Thismethodmayprovideawayforthefabricationofcomplex2-Dpatternsusingsimple1-Dmasters.